Abbreviations / Aviation / L – R

This is the fourth part of the Abbreviations / Aviation list.

List of abbreviations

Part 1	A.	A.
Part 2	B-D	B ; C ; D.
part 3	E – K	E ; F ; G ; H ; I ; J ; K
Part 4	L-R	L - ( LA , LB , LC , LD , LE , LF , LG , LH , LI , LJ, LK , LL , LM, LN , LO , LP , LR , LS , LT , LU , LV , LW , LY ); M - ( MA , MB , MC , MD , ME , MF , MG , MH , MI , MK , ML , MM , MN , MO , MP , MR , MS , MT , MU , MV , MW , MX , MZ ); N - ( NA , NB , NC , ND , NE , NF , NG , NI , NK , NL , NM , NN , NO , NP , NR , NS , NT , LV , NW , NX , NY , NZ ); O - ( OA , OB , OC , OD , OE , OF , OG, OH , OI , OJ , OK , OL , OM , ON , OO , OP , OQ , OR , OS , OT , OU , OV , OW , OX ); P - ( PA , PB , PC , PD , PE , PF , PG , PH , PI , PJ , PK , PL , PM , PN , PO , PP , PQ , PR , PS , PT , PU , PV , PW , PY , PZ ); Q - ( QA , QC , QD , QE , QF , QH , QM , QN , QP , QQ, QR , QT , QU , QV , QZ ); R - ( RA , RB , RC , RD , RE , RF , RG , RH , RI , RK , RL , RM , RN , RO , RP , RQ , RR , RS , RT , RU , RV , RW , RX , RZ )
Part 5	S-Z	S ; T ; U ; V ; W ; X ; Y ; Z
Part 6	Russian abbreviations
Part 7	numbers	numbers
Part 7	attachment	Abbreviations NOT taken into account ; Sort criteria
Part 7	Examples	Flight plan ; VFR Bulletin ; METAR

L.

(to the next letter - M) ... (to the beginning of the list)

LA , LB , LC , LD , LE , LF , LG , LH , LI , LJ , LK , LL , LM , LN , LO , LP , LR , LS , LT , LU , LV , LW , LY

L.	Lima	Int. Spelling Alphabet ( ICAO Alphabet )
L.	Locator, locator beacon	NDB radio beacon (mostly in connection with ILS); weak NDB transmitter (approx. 25 NM guaranteed range), which marks the beginning of the approach
L.	Left (RWY identification)	Left ( RWY designation)
L.	Wind Correction Angel (WCA)	Windward angle; Lead angle
L.	Low Level (Chart Designator)	low (e.g. low level IFR chart)
L.	liter	liter
L.	Light	Weight class light, (Maximum Take Off Weight) MTOW <7 t
LA	Low approach	Low approach: approaching a runway followed by a go-around without touching down
LAA	Local Airport Advisory
LAAS	Local Area Augmentation System (GPS)	An all-weather aircraft landing system based on the real-time correction of a differential GPS system
LAAS	Low Altitude Alert System
LAC	Local area controller
LACAC	Latin American Civil Aviation Commission
LAHSO	Land and Hold Short Operations (LAHSO-DRY; LAHSO-WET)	Pronounced: “Lay-So”; the landing aircraft should land and stop immediately on the runway (hold short) - e.g. B. to avoid a collision with another object or because of dangers on the runway - z. B. Often required for "Simultaneous Operations on Intersecting Runways" (SOIR)
LAMA	Light Aircraft Manufacturers Association	Association of Light Aircraft Manufacturers (USA)
LAME	Licensed Aircraft Maintenance Engineer
LANTIRN	Low Altitude Navigation and Targeting InfraRed for Night	Infrared controlled low-level navigation and targeting system for night missions
LAPL	Light Aircraft Pilot License
LASORS	Licensing, Administration and Standardization; Operating Requirements and Safety	British authority which, among other things, regulates the licensing of pilots and defines the requirements for airlines
LASU	Large Aircraft Sector Understanding
LOAD	Low Altitude Safety and Targeting Enhancement System	With the A-10 - continuously provides the computer-calculated point of impact of free-fall ammunition
LAT	Latitude	Latitude (geographical latitude)
LAT	Lateral
LAT	Low-Altitude Tactics
LAV	Lavatory	On-board toilet , washroom / toilet
LAW	Landing Weight	Weight of the aircraft on landing
LAWRS	Limited Aviation Weather Reporting Station
lb, LB	Pound (singular) (or lbs or LBS - plural)	English pound (unit of measure); Quantity (weight) for the fuel : 1 lb = 0.45359 kg; 1 gal = approx. 3.08 kg = approx. 6.8 lbs
LBA		Luftfahrt-Bundesamt - the higher federal authority for the tasks of civil aviation in Germany
lbf.	pound feet	Anglo-American unit for torque - the SI unit is Nm
LBCM	Locator back course marker	Back approach course marking
LBM	Locator back marker	Approach fire marking on the back
LBS or lbs	Pounds (plural) (or lb - singular)	Pound ; 1 lb = 0.45359 kg; 1 gal = approx. 3.08 kg = approx. 6.8 lbs
LC	Landing chart	Landing map
LC	Local control
LCC	Low cost carrier
LCD	Liquid crystal display	Liquid crystal screen
LCF	Low cycle fatigue
LCF	(Boeing 747) Large Cargo Freighter	The Boeing equivalent of the Airbus Beluga
LCG	Load Classification Group
LCL	Local	locally
LCML	Low Calorie Meal (Catering Code)	Low calorie food - see: airplane food
LCN	Load Classification Number	Load capacity number, replaced by Pavement Classification Number (PCN)
LCO	Limit cycle oscillations	( Related to chatter ) Limited amplitude vibrations - stop surging further
LCOM	Compass locator at ILS middle marker
LCTD	Located	Is located
LCTR	Compass Locator (Locator Beacon)
LCVASI	Low Cost Visual Approach Slope Indicator	Special runway lighting
LCZR	Localizer
L / D	Lift to drag ratio, lift over drag	Glide ratio (ratio of dynamic lift to air resistance )
LD1	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LD2	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LD3	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LD6	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LD7	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LD8	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LD11	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container
LDA	Landing Distance Available	Available landing route
LDA	Localizer-Type Directional Aid (USA)	Landing course direction aid (e.g. LDA approach)
LDG	Landing	landing
LDG GR	Landing Gear	Landing gear (aircraft)
LDI	Localizer Deviation Indicator	Landing course deviation indicator in the ADI
LDI	Localizer Direction Indicator	Landing direction indicator
LDI	Landing Direction Indicator	Landing direction indicator
LDIN	Lead-in Lighting System, Lead-in Light System	Beacon
LDM	Load distribution message	Notification of cargo on board
LDMCR	Lower Deck Mobile Crew Rest
LE	Leading Edge	Wing nose ; Wing leading edge; Leading edge ( wing )
LE	Left engine	Left engine
LED	Leading Edge Device	Buoyancy aid on the wing leading edge; Slats
LED	Light Emitting Diode	light emitting diode
LEN	Length	length
LEQ	Less Than or Equal To	The comparison sign "less than or equal to" (≤)
LERX	Leading-Edge Root Extensions	Nasal edge root enlargements (see also LEX)
LEX	Leading Edge Extension	Buoyancy aid on the wing leading edge
LF	Low frequency	Long wave
LF	Left front	Left front; left front
LFC	Laminar flow control	Laminarization of the flow through boundary layer suction on the entire wing
LFE	Landing field elevation	Runway height above sea level
LFG		Aviation Act (Austria)
LFL	Landing field lengths	Runway length
LFML	Low Cholesterol Meal (Catering Code)	Low-fat food - see: Airplane food
LFR	Low frequency radio range	Range in the long wave range
LFR		Aviation rules (Austria)
LFT		Aerial supervision
LFT	Left	Left
LFT	Lufthansa Flight Training
Lfz, LFZ	Aircraft	Aircraft (the generic term for airplane , helicopter , etc.)
LG	Large	big
LG	Low glideslope	Part of the three-bar VASI (3 °)
LG	Landing Gear	Landing gear (aircraft)
LGCIU	Landing Gear Control and Interface Unit	Landing gear control computer (Airbus)
LGMM	Logistics Policies and Procedures	( Air National Guard - ANG / LGMM)
LGND	Legend	Legend (map)
LGS	Latvijas Gaisa Satiksme	Latvian air traffic control
LGT	Light; Lighting	Light, fire, lighting , lighting
LGTD	Lighted	illuminated
LGTH	Length	length
LGTS	Lights	Lights
LGTU	Landing Gear Transfer Unit	( B737 )
LGW	Landing Gross Weight
LH	Left hand	Left
LH	Left Hand (Pattern)	Left round ( fly traffic pattern counterclockwise)
LHO	Live Human Organs (Cargo Code)	Human donor organs
LIAL	Low intensity approach lights	Weak approach lighting
LIDAR	Light detection and ranging	Method for measuring distance and speed - analogous to radar - Radiowave Detection and Ranging; is z. B. used for the detection and prediction of wake vortices
LIFR	Low Instrument Flight Rules	Rules for low instrument flight (main cloud base below 500 ft. And / or visibility below 1 SM)
LIH	Light Intensity High	High performance lighting
LIL	Light Intensity Low	Low power firing
LIM	Light intensity medium	Medium-strength lighting
LIM	Inner marker locator
LIM	limit	border
LIRCLL	Low Intensity Runway Center Line Lights	Weak train center lights
LIRL	Low intensity runway lights	Runway lighting with low power (see: lighting )
LIZFW	Loaded Index Zero Fuel Weight	(on the loadsheet)
LK	Lake	lake
LK	Lock	Blockade, lock
LKD	Locked
LL	Low level	At a low level (e.g. LL Flt. - Low Level Flight)
100LL	Grade 100 Low Lead Gasoline	AvGas - jet fuel - 100 octane, low lead
LLCP	Low level critical point	Similar to ETOPS
LLK	Intercooler	Intercooler
LLP	Life-limited part	A component with prescribed replacement times, inspection intervals or comparable procedures for maintaining airworthiness
LLV	-	Landing site noise protection ordinance
LLWAS	Low-Level Wind Shear Alerting System, Low-Level Wind Shear Alert System	Sensor system at some large US airfields to warn of wind shear
LLZ	Localizer	Landing course transmitter
LLZ / DME	Localizer / DME approach	a non-precision approach
LM	Locator at Middle Marker Site	Space approach beacon at the main entry sign ( instrument landing system )
LM	Low man
LMC	Last minute change	Change (change) at the last minute
L / MF	Low / Medium Frequency	Long wave , medium wave
LMLG	Left Main Landing Gear	Left main landing gear - landing gear (aircraft)
LMM	Compass Locator at Middle Marker, Localizer Middle Marker, Locator Middle Marker	Main entry signs ( instrument landing system )
LMT	Local mean time	(Mean) local time
LMTD	Limited	limited, limited
LN, LN	Left nose	left front
LN	Aviation standard	DIN 9300
LNAV, L NAV	Lateral navigation	Horizontal navigation - a function of area navigation ( RNAV )
LND	Landing	Land
LNDG	Landing	Land
LO	Locator at Outer Marker Site	Approach radio beacon at pre-entry signal ( instrument landing system )
LO	Low altitude	Lower airspace (under flight level 245 - see: Airspace structure ); lower, lower, weak
LO	Low	low, weak
LOA	Letter of Authorization	Official credentials (including a driving license for experimental aircraft; LOA for RVSM-approved aircraft - Reduced Vertical Separation Minima)
LOC	Localizer	Landing course transmitter (part of the ILS )
LOC	Local; Location; located	local, place, located
LOCAAS	Low Cost Autonomous Attack System	US Air Force drone system used to combat armed and unarmed vehicles
LOC / DME	Localizer / DME approach	a non-precision approach
LOFT	Line-Oriented Flight Training, engl. Line-oriented flight training	Training in the flight simulator with the entire crew, whereby representative flight segments are flown which contain normal procedures, as well as abnormal procedures and emergency situations that can occur in the line service
LOGO	Logographic	See: logography
LOSA	Line Operations Safety Audit	Analysis method in aviation by collecting safety-relevant data
LOL	Loss of License	Loss of license (insurance against loss of license)
LO / L	Locator; Outer (NDB)	Approach radio beacon at the pre-entry sign
LOLI	Loss of Lifting Conditions En Route	Loss of lift while cruising
LOM	Compass Locator at Outer Marker, Localizer Outer Marker, Locator Outer Marker	Approach light at the pre-entry signal
LONG	Longitude, longitudinal	Longitude
LOP	Line of Position	Radio stand line , stand line
LOP	Lift-off point	Take-off point
LOPA	Layer of Protection Analysis	( Flight safety )
LOPA	Layout of Passenger Accommodations	Description of the cabin equipment
LORAN	Long range navigation system	Hyperbola navigation method
COME ON	Line of sight	Line of sight
LOSA	Line Operations Safety Audit	Procedure for assessing flight safety in scheduled services
LOV	Limit of Validity	operational limit of the service life of the aircraft structure based on fatigue tests
LOX	Liquid oxygen	Liquid oxygen
LP	Low pressure	Low pressure ...
LP	Loop	loop
LPC	Low pressure compressor	Low pressure compressor
LPC	Line proficiency check	Review of qualification for liner service
LPC	Less paper in the cockpit concept	Less paper in the cockpit concept ( Airbus )
LPC		Aviation Press Club
LPM	Landing Performance Monitor
LPM	Liters per minute	Liters per minute
LPML	Low Protein Meal (Catering Code)	low-protein food - see: airplane food
LPO	Long Period Oscillation	see phygoids
LPS	Letové Prevádzkové Služby	Slovak air traffic control
LPT	Low pressure turbine	Low pressure turbine
LPV	Localizer performance with vertical guidance	Precision WAAS-GPS approach without ground-side installations, as LPV200 up to a decision height of 200 ft.
LR	Long range	Long-haul flight authorization; Long range version of an airplane
LR	Lapse rate	Temperature decrease over altitude (0.65 ° C / 100 m; 2 ° C / 1000 feet)
LR	Lead Radial	Guide radial (at least 2 NM before turning onto the final course)
LR	Long range	Long-haul flight authorization; Long-haul version of an aircraft (e.g. Boeing 777 -200LR; Airbus 319 LR )
LR	Left rear	Left stern
LRA	Landing Rights Airport (for Initial Entry) (USA)	Airport right to land, for the first flight to the USA (with customs - after prior notice)
LR-A	Long range ATPL	Airline pilot license for long-haul flights ( long-haul flight )
LRAACA	Long Range Air Anti (-submarine-warfare) Capability Aircraft	Long-range aircraft - for submarine hunting
LRBL	Least Risk Bomb Location	the place where you drop a bomb that you find on the plane during the flight (e.g. on the B737: right rear door on the escape slide, under the window)
LRC	Long range cruise	Cruising speed for long haul ( long haul flight )
LRCU	Landing and Rollout Control Unit	Landing and roll-out control unit ( Boeing 747 )
LRG	Long range	Long-haul flight authorization ( long-haul flight )
LRG	Long range aircraft	Long-haul aircraft
LRH	Light Reconnaissance Helicopter	Light reconnaissance helicopter
LRM	Line replaceable module
LRN	Long-range navigation	Long distance navigation
LROPS	Long Range Operational Performance Standards	Name of the EASA for ETOPS rules that apply to airplanes with more than two engines.
LRRA	Low Range Radio Altimeter	Radar altimeter
LRU	Line Replacement Unit, Line Replaceable Unit	Quick change unit
L / S	Loadsheet	Loading plan - as part of the calculation of Weight and Balance (weight and center of gravity calculation )
LS	Low speed	Low speed
LS	Line Select	Select line; Select one of the 6 right or left lines on the Control and Display Unit (example: LS6R = select 6th line on the right)
LSA	Light-Sport Aircraft	Light sport aircraft - in the USA: maximum take-off weight 600 kg, maximum flight speed in level flight 120 kt; a category of light aircraft
LSALT	Lowest Safe Altitude	Lowest Safe Height
LSB	Lower sideband	Lower sideband (radio)
LSHF	Lower-Surface Hot Film	(Aerodynamics of the wings) hot air layer on the underside of the wing during supersonic flights
LSK	Line Select Key	Line selection button - on the Control and Display Unit
LSK / LV		Air Force / Air Defense ( Air Force of the GDR )
LSML	Low Sodium Meal (Catering Code)	Low-sodium (low-salt) food - see also: Salt-free food - NSML - see: Airplane food
LSO	Landing Signal Officer	Landing signal officer (on an American aircraft carrier)
LSP	Limit selector panel
LSQ	Line squall	Gust line
LSR	Loose snow on runway	Loose snow on the runway
LSTC	Limited Supplemental Type Certificate	Limited type approval for modifications or additional equipment of the aircraft
LSU	Lavatory Service Unit
LT	Left turn	Left turn
LT	Left	left
LT	Light	light
LT	Local time	Local time
LTA		Airworthiness instructions - from the Federal Aviation Office (LBA)
LTB		Aeronautical operation
LTD	Limited	Limited; limited
LTDQTY	Limited Quantity (Cargo Code)	Limited amount
LTF	Local training flight
LTG	Air Transport Wing (German Air Force)	Air Transport Squadron (e.g., Air Transport Squadron 62 ); also English: Airlift Squadron - AS
LTH		Aeronautical manual
LTO	Landing take-off
LTS	Lights	Lights
LTS	Load and Trim Sheet
LuFo		Aviation research program - the Federal Republic (up to 2008 from the federal government 160 million euros)
LuftBO		Operating rules for aviation equipment
LuftGerPO		Test regulations for aviation equipment
LuftGerPV		Ordinance on testing aviation equipment
LuftKostV		Cost regulation of the aviation administration
LuftNaSiG		Aviation Proof Security Act (1997; Act to ensure proof of ownership and control of air carriers for the maintenance of the air traffic operating license and air traffic rights)
LuftPersV		Aviation Personnel Ordinance
LuftSiG		Aviation Security Act
LuftVG		Aviation Act
LuftVO		Air traffic regulations
LuftVZO		Aviation Licensing Regulations
LVDT	Linear Variable Differential Transducer
LVL	Level	Longitudinal axis stabilizer (With the LVL option, the autopilot controls the aircraft with the lowest possible bank angle in [low] wind turbulence.)
LVL / CH	Level change	Changing the flight altitude (mode on the autopilot )
LVNL	Luchtverkeersleiding Nederland	Dutch air traffic control
LVOR	Low Altitude VOR	Short-range rotary radio beacon (as opposed to HVOR - High Altitude VOR)
LVP	Low visibility procedures	Procedure in low visibility
LVR	Last Visual Reference
LVSTCK	Livestock	cattle
LVT	Low volume terminal
LVTO	Low visibility take-off	Start in poor visibility
LW	Landing Weight	Landing weight
LW	Left wing	Left wing
LWF	Lightweight fighter	Light hunter
LWR	Lower	lower
LYR	Layer	Layer; Cloud layer (see: Cloudiness ); layered

to the beginning of the letter - L

M.

(to the next letter - N) ... (to the beginning of the list)

MA , MB , MC , MD , ME , MF , MG , MH , MI , MK , ML , MM , MN , MO , MP , MR , MS , MT , MU , MV , MW , MX , MZ

M.	Mike	Int. Spelling Alphabet ( ICAO Alphabet )
M.	minus	Minus (sign before numbers; e.g. M03)
M.	Mach; Do number	Mach number (e.g. CRZ M78 = cruising speed 0.78 Mach)
M crit , M crit	Critical Mach Number	Critical Mach number
M.	Magnetic	misrepresenting
M.	medium	Weight class medium, (Maximum Take Off Weight) 7 t ≤ MTOW ≤ 136 t
M.	Economy Discount Class (IATA)	Tourist class ( booking class )
M.	Mike - marginal	GAFOR weather code for: ground visibility more than 1.5 km (and / or) main cloud base over 500 ft above the reference area
m, M	Meter (s)	meter
M.	Month	month
M DF	Demonstrated Diving Speed ​​Mach Number	Demonstrated orbital pitch flight speed , also indicated as V DF (Vdf / Mdf)
M MO	Maximum Mach Operating Speed	Maximum permissible flying Mach number (see: Machmeter , Critical Mach number )
Ma	Mach number	Dimensionless number that indicates the ratio of the airspeed (v) to the speed of sound (a) in the surrounding medium (Ma = v / a)
MA	Minimum altitude	Minimum altitude above sea level
MA	Monitor alert
M / A	Missed Approach	Missed approach
MAA	Maximum Authorizes IFR Altitude, Maximum Authorizes Altitude	Maximum allowance
MAA	Mean time between failures	Mean distance to failure
MAC	Military Aircraft Configuration
MAC	Military Airlift Command
MAC	Mean Aerodynamic Chord	Mean aerodynamic wing chord ; Example: when preparing for take-off, the setting of the rudder trim is calculated as the position of the CG in "% MAC" - the center of gravity of the aircraft is calculated as a percentage of the mean aerodynamic wing depth, which then gives the exact values ​​for the adjustment of the trim wheel (in the In practice, the values ​​are not calculated, but read from tables)
% MAC		See: MAC
MACG	Marine Air Control Group
MACTOW	% MAC at Take off Weight
MADARS	Malfunction Analysis Detection And Recording System	( Lockheed C-5 )
MAF	Mobility Air Forces	( Air National Guard - ANG)
MAG, Mag	Magnetic	Misleading; magnetic, usually the magnetic declination of the compass is meant
LIKE	Magneto	Ignition magnet (see: Ignition (internal combustion engine) )
LIKE	Minimum Safe Grid Altitude	Lowest safe grille height
LIKE	Magnetized (Cargo Code)	Magnetic materials (see: permanent magnet )
LIKE	Marine Air Group
MAGSA	Mutual Assistance Ground Service Agreement
MAHP	Missed Approach Holding Point	Missed approach hold point
MAHWP	Missed Approach Holding Waypoint	Missed approach hold waypoint
MAINT	Maintenance	Maintenance ; maintenance
MAINT	Maintain	Keep it, continue
MALF	Malfunction	Malfunction
MALLAW	Maximum Allowed Landing Weight	Maximum permitted landing weight (also MALLW)
MALS	Medium Intensity Approach Light System	See: lighting
MALSF	Medium-intensity Approach Light System With Sequenced Flashers	MALS With Sequenced Flashers (see: firing )
MALSR	Medium Intensity Approach Light System with Runway Alignment (with RAIL)	Medium power runway lighting with side row lighting; MALS with RAIL (see: lighting )
MALTOW	Maximum Allowed Take Off Weight	Maximum allowable take-off weight
MALTXW	Maximum Allowable Taxi Weight	Maximum rolling weight (also MTW - Maximum Taxi Weight)
MALW	Maximum Allowable Landing Weight	maximum landing weight
MAMS	Military Avionics and Mission System
MAN	manual	Manual
MAP	Aeronautical Maps And Charts	Aeronautical charts
MAP	Manifold Air Pressure, Manifold Pressure, Manifold Absolute Pressure	Boost pressure
MAP	Million Annual Passengers	Million passengers a year
MAP	Missed Approach Procedure	Missed Approach Procedure
MAP	Missed Approach Point	Missed Approach Point
MAP	Fashion Annunciator Panel	Display of the activated modes of the autopilot (mostly in the upper half of the Primary Flight Display - PFD - integrated - above the Attitude Direction Indicator - ADI; left: Auto Throttle Modes; middle: Roll Modes; right; Pitch Modes; shows in which mode the Flight Director / Autopilot is or which mode is armed) - also: Flight Mode Annunciator - FMA
MAPT, MAPt	Missed Approach Point	Missed Approach Point
MAR	March	March
MAR	Maritime; at Sea	At sea
MARSA	Military Authority Assumes Responsibility For Separation Of Aircraft
MASI	Mach / Airspeed Indicator	Combined speed display and mach meter
MASPS	Minimum Aviation System Performance Standard
MAST	Make Airspeed Indicator
MAT	Maintenance Access Terminal	( Boeing 777 )
MATOW	Maximum Allowable Take-Off Weight	maximum take-off weight; maximum take-off weight (see maximum take-off weight )
MATS	Malta Air Traffic Services	Air traffic control Malta
MATZ	Military Aerodrome Traffic Zone	Traffic zone of a military airfield
MAV	Micro Air Vehicle	Microflane
MAW	Medical Airworthiness
MAW	Marine Aircraft Wing
MAWEA	Modular Avionics and Warning Electronics Assembly, Modular Avionics Warning and Electronic Assembly
MAWP	Missed Approach Waypoint	Missed Approach Waypoint
MAWTS-1	Marine Aviation Weapons and Tactics Squadron – One
MAX	maximum	Maximum, maximum ...
MAX DIFF	Maximum differential	Maximum permissible pressure difference between cabin pressure and outside pressure
MAXZFW	Maximum Allowed Zero Fuel Weight	Maximum empty tank weight; maximum aircraft weight without fuel
MAY	May	May
MAYDAY	International Distress Radio Signal	International emergency call sign - Mayday (emergency call)
MB	Magnetic bearing	Magnetic bearing
mb, MB	millibar	Millibar ( air pressure , out of date; 1 mbar = 1 hPa; 1 mb = 0.001 bar) - see: bar (unit)
MBB		Messerschmitt-Bölkow-Blohm
MBOH	Minimum break off height
MBS	Millibars	Millibar ( air pressure , out of date; 1 mbar = 1 hPa; 1 mb = 0.001 bar) - see: bar (unit)
MBS	Military aircraft crew certificate
MBZ	Mandatory Broadcast Zone	(Australia, New Zealand) Airspace in which radio contact is mandatory (ready to listen) - Call by radio at least every 20 minutes (position, height, intentions), the usual reports in the traffic area, entering and leaving the MBZ must be reported ; Expansion: z. B. 3 NM around certain airfields
MBST	Microburst ( downburst )	Falling cold air (small-scale) - great danger on landings - difficult to predict
MC	Magnetic Course	Magnetic Course ( Magnetic Bearing )
MC	Magnetic Compass	Magnetic compass
MC	Major Component
MC	Master Caution	(Master caution light on glare panel) Main warning lamp, which then prompts the pilot to look for which specific warning lamp has come on. He confirms the receipt of the warning by pressing the lamp, thus turning it off. The master caution lamp is yellow, next to it the master warning lamp (MW) is red and also coupled with a warning tone
MC	Mission Console
MCA	Minimum controllable air speed	Minimum speed at which the aircraft can still be controlled
MCA	Minimum crossing altitude	Minimum overflight altitude; Minimum crossing height
MCA	Minimum cruising altitude	Minimum cruising altitude
MCA	Military Controlled Airspace	Military surveillance zone
MCA	Major component assembly
MCA	Medium Combat Aircraft	(India)
MCAS	Marine Corps Air Station	United States Marine Corps airfield
MCAS	Maneuvering Characteristics Augmentation System
MCC	Maintenance Control Center	The Maintenance Control Center monitors the technical condition of the aircraft under care worldwide on the ground and in the air and controls the necessary measures.
MCC	Multi crew coordination; Multi crew cooperation; Multi-crew co-operation
MCC	Mission Control Center
MCD	Moveable Class Divider	Slidable curtain with which the classes are optically separated
MCD	Magnetic Chip Detector
MCDU	Multifunction Control and Display Unit, Multi-Purpose Control and Display Unit	Multifunctional display of the flight management system
MCH	Do	(Speed ​​specification) - e.g. B. MCH 81 = 0.81 M
MCL	Minimum cruising level	Minimum flight area
MCL	Maximum climb (engine rating)
MCLT	Maximum climb thrust	maximum allowable thrust for the climb
MCM	Maintenance Control Manual
MCO	Maximum Continuous (Thrust)	Maximum continuous thrust
MCP	Mode control panel	Control unit for the autopilot and autothrottle (see throttle lever ) - (on large aircraft) - directly below the windshield - in the middle between the two pilots
MCP	Maximum continuous power	Continuous power, see: Maximum Continuous (Thrust) - MCO
MCR	Maximum cruise thrust	Maximum thrust for cruise
Mcrit		Critical Mach number - the velocity of the flow at which the airframe or wing reaches the speed of sound at one point
MCRT	Maximum cruise thrust	maximum thrust allowed for cruising
MCT	Minimum cost track	Flight path that leads to the lowest costs (fuel, overflight charges, etc.), a very frequently used optimization criterion in flight path planning
MCT	Maximum continuous thrust	Maximum continuous thrust; Continuous power of an engine
MCT	Maximum cruise thrust	Maximum travel thrust (engine)
MCT	Minimum connecting time	Minimum transfer time at an airport
MCU	Modular Concept Unit
MD	Design Dive Mach	Mach number designed for the dive
MDA	Minimum Descent Altitude	Minimum descent altitude above MSL
MDA (H)	Minimum Descent Altitude (Height)
MDC	Military Diplomatic Clearance	Diplomatic clearance
MDH	Minimum Descent Height	Minimum descent altitude above threshold (only applies to non-precision approaches )
MDI	Moving Dial Indicator	A variant of three ADF display devices ( radio navigation )
MDI	Minimum departure interval	Minimum departure intervals
MDL	Modules	module
MDS	Maintenance Diagnostic System	Maintenance diagnostic system
MDT	Minimum distance track	Flight path with the smallest distance, rarely used flight path optimization criterion
MDT	Mountain Day Time
ME	Multi engine	Multi-engine
MEA	Minimum En-Route (IFR) Altitude; Minimum enroute altitude; Minimum Safe En-Route Altitude	Minimum cruise altitude; Safety minimum height ; minimum altitude for a flight route; IFR minimum route height
MEARTS	Micro-En-Route Automated Radar Tracking System
MEC	Maximum endurance cruise	Cruising speed for maximum flight duration (lowest fuel consumption per unit of time - is selected, for example, if a required improvement in the weather is only forecast after a longer period of time at the destination airport and the time has to be "killed" waiting for the weather to improve. If the flight is even slower, However, if the angle of attack increases and thus the air resistance and fuel consumption - and the maximum possible flight time is reduced again) - not to be confused with speed for maximum range
MEC	Main engine control
MEC	Main Equipment Center
MED	medium	medium strength
MEDA	Maintenance Error Decision Aid	Human error investigation program
MEDA	Medical case (passenger)	Long-term care passenger
MEF	Maximum elevation figures	Height of the highest obstacle in an area plus safety height (on flight maps)
MEG	Monoethylene glycol	Mono- ethylene glycol - ( aircraft de- icing )
MEHT	Minimum Eye Height Over Threshold	Minimum eye height above the threshold (MEHT = EWH (eye wheel height) + WTH (wheel height over threshold))
MEI	Multi engine instructor
MEIR	Multi engine instrument rating
MEL	Minimum equipment list	Minimum equipment list
MEM	Memory	Storage
MEM	Memorial	monument
MEML	Memorial	Memorial, memorial ...
MEP	Multi engine piston
CEST	Central European Summertime (CEST)	Central European Summer Time
MET	Meteorological; Meteorology	Weather ; Meteorology, meteorological, weather- wise
METAR	Meteorological Aviation Routine Weather Report ; Aviation Routine Weather Report; Aerodrome Actual MET Report	Scheduled aviation weather report; current airport weather information
METO	Maximum Except Take-Off Power, Maximum Power Except Take-Off, Maximum Continuous Power	Maximum permissible continuous power (only used for piston internal combustion engines)
MEW	Manufacturer's Empty Weight
CET	Central European Time CET	Central European Time
MF	Medium Frequency	Medium wave (300-3000 kHz)
MFA	Minimum flight altitude	Minimum altitude
MFD	Multifunction display	Multipurpose display; switchable display
MFD	Manufacture date	Production date
MFF	Mixed fleet flying
Kind regards	Naval Air Wing (GNY, East German Navy)	Naval Aviation Squadron (see: Naval Aviation )
MFL	Maintain Flight Level
MFS	Military aircraft driver's license
MFT	Minimum fuel track	Flight path with the lowest fuel consumption, frequently used optimization criterion in flight path planning
MFW	Maximum fuel weight	Aircraft weight
MGA	Minimum Safe Grid Altitude, Minimum Grid Altitude	Minimum safety height
MGSIA	Minimum glideslope intercept altitude	The lowest published altitude for an ILS approach at which the glide path may be approached (Final Approach Segment)
MgN	Magnetic North	Magnetic compass north
MGR	Manager
MGT	management	(e.g. PWR MGT - Power Management Selector)
MH	Magnetic heading	Magnetic heading (mwSK); magnetic heading, compass heading
MH	Man hour	Man hour ( person hour )
MHA	Minimum holding altitude	Lowest waiting height (see: Waiting loop )
MHC	Mile High Club	Sex on the plane - at least 1 mile altitude - 5,280 ft
MHz, MHZ	Mega Hertz	Megahertz (1 MHz = 1,000,000 Hertz)
MI	Shallow	Flat; on the ground (weather key for METAR and TAF ) - French: mince
MI	Medium intensity (lights)	medium (lights)
MI	Miles	Miles (country mile)
MIA	Minimum IFR Altitude
MIAL	Medium intensity approach lights	Medium-strength approach lights
MIALS	Medium Intensity Approach Light System	Medium-strength approach lighting system
MIAS	Miles per Hour Indicated Airspeed	Displayed speed in miles ( statute mile ); in contrast to KIAS (Knots Indicated Airspeed - displayed speed in knots)
MIC	Microphone	microphone
MID	Middle East	Middle East (ICAO region)
MIDO	Manufacturing Inspection District Office	FAA field office
MIDS	Multifunctional Information Distribution System
MIFG	Shallow fog	Flat fog, meadow fog
Mil	Military	military
Mil	Military airfield	Military airfield
MIN	Minute (s)	Minute (s)
MIN	minimum	at least (example: separation MIN - minimum separation distances )
MINS	Minimum
MINTOF	Minimum take-off fuel
MINTOW	Minimum take-off weight	Minimum take-off weight
MIOC	Multifunction Integrated Optic Chip	Optical building block
MIRL	Medium intensity runway lights	Runway lights with medium power
MISC	Miscellaneous	Miscellaneous
MITO	Minimum interval take off	Starting sequence with the smallest possible distance
MIX	Mixture Control	Mixture regulator for the engine (see: Fuel system )
MKGS	Markings	Markings
MKR	marker	mark
MKR	Marker Radion Beacon	Marker beacons
MKR BCN	Marker Radion Beacon	Marker beacons
MLAW	Maximum landing weight	Maximum landing weight
MLDI	Meter List Display Interval
MLG	Main landing gear	Main landing gear ( landing gear (aircraft) )
MLO	Mishandled Load Office	Baggage tracing
MLS	Microwave Landing System	Microwave landing system
MLU	Mid-life update	Retrofitting an aircraft after half of its useful life
MLW	Maximum Landing Weight , Maximum Certified Landing Weight , Maximum Allowable Landing Weight	maximum structural landing weight; maximum landing mass; Maximum landing weight; maximum permitted landing weight
MM	Middle marker	Main entry sign (The receipt of the main entry sign is indicated in the cockpit by a yellow flashing light (amber light) and an associated acoustic signal (short-long).)
MM	Maintenance manual	Maintenance manual
MM	Month	Month (two-digit format: 01, 02, ..., 12)
MMA	Multi-Mission Maritime Aircraft	Multipurpose maritime patrol aircraft ; General purpose naval aircraft
MMD	Master monitor display	(Fighter cockpit)
MMEL	Master Minimum Equipment List
MMI	Human-machine interface, user interface	Man-machine interface, man-machine interface
MMLS	Military Microwave Landing System	Military microwave landing system
MMO	Maximum Mach Operating Speed, Maximum Operating Speed ​​In Mach Number	Maximum permissible flying Mach number (see: Critical Mach number )
MMR	Multi-mode receiver	Multi-frequency receiver
MMR	Do meter reading	Speed ​​display on the machmeter
MN	Magnetic North	Magnetic north
MN	Do number	Mach number
MN	Main	Head-…
MND	Mound	hill
MNH	Mach Number Hold; Hold Mach Number	Keep speed at Mach (option on the autopilot; the automatic thrust control must be activated for this)
MNM	minimum	Minimum (example: MNM noise routes)
MNPS	Minimum Navigation Performance Specifications	Specification for minimum navigation performance; from FL285 to FL420 (usable cruising levels: from FL290 to FL410 inclusive); north of 27 ° N-90 ° N over the Atlantic and FL330 to FL410 over Canada; only for aircraft with approved precision long-range navigation procedures: lateral graduation 60 NM (instead of 120 NM), height graduation 1,000 ft; Time graduation (longitudinal) 10 min (instead of 30 min)
MNR	Minimum noise routing	Departure routes for the least amount of noise
MNT	monitor	Monitor
MNTN	Maintain	Maintain (e.g. altitude or course)
MOA	Military Operations Area	Military operational area; military training area
MOA	Minimum operating altitude
MOC	Minimum obstacle clearance	Minimum obstacle distance
MOC	Maintenance operation control
MOCA	Minimum Obstacle Clearance Altitude, Minimum Obstacle Clearance Altitude	lowest flight altitude that guarantees at least 1000 ft obstacle clearance
MOD	Moderate	moderate (e.g. MOD ICING)
MOD	Modify	Modify
MOD	Modification; Modify	modification
MOD	Modules	module
Mode A	Transponder setting	Identification signal only; Interrogation pulse on 1030 MHz, sends on 1090 MHz, pulse length 8 ms
Mode C	Transponder setting	In addition to mode A (/ 3) altitude information based on 1013.2 hPa; Pulse length 21 ms
Mode S	Discrete addressable secondary radar system with data link	Transponder setting: In addition to mode C (/ 3) data block contains: address, altitude, aircraft identification, status of aircraft on the ground or in the air), recommendations from the on-board TCAS (if available)
MOE	Maintenance organization exposure
MOF	Maintenance Operations Flight	( Air National Guard - ANG)
MOGAS	Motor gasoline	Petrol station premium gasoline = Aviation Gasoline - AvGas ; see also: jet fuel
MOML	Muslim Meal (Catering Code)	Muslim food - see: airplane food
MON	Monday	Monday
MON	monitor	Screen ; observe
MON	Above Mountains	Over mountains; over the mountains
PUG	Minimum operational performance standards
MOPSC	Maximum operational passenger seating configuration
MORA	Minimum off-route altitude	a minimum flight altitude calculated by Elrey B. Jeppesen which ensures an obstacle clearance of 1000 ft within a corridor of 10 nm on both sides of the center line of the airway, up to an obstacle height of 5000 ft and above that an obstacle clearance of 2000 ft; the MORA is important in an emergency descent
Cunt		Motor sailer
MOT	Ministry of Transport	Department of Transportation (Canadian Aviation Administration)
MOTNE	Meteorological Operational Telecommunications Network Europe	Flight meteorological network of all major European airports
MoU	Memorandum of Understanding	Plane purchase
MOV	Moving	moving
MP	Maintenance Period	Maintenance interval
MP	Manifold Pressure	Boost pressure
MPA	Maritime patrol aircraft	Maritime patrol aircraft
MPA	Man powered aircraft	Muscular strength plane
MPC	Maximum power check	helicopter
MPD	Maintenance Planning Document, Maintenance Planning Data	Maintenance planning
MPH	Statute Miles per Hour	Country mile (s) per hour (1.608 km / h)
MPI	Major Periodic Inspection	Large (annual) review
MPL	Multi-crew pilot license	new airline pilot license since November 2006. While the training with an ATPL takes place gradually (private pilot license - PPL; commercial pilot license with instrument rating - CPL IR; airline transport pilot license - ATPL, Multi Crew Coordination - MCC), with the MPL Training only takes a single exam at the end. During the training, the division of labor between pilot flying and pilot monitoring begins very early on. Compared to conventional training, there are considerably more simulator hours instead of real flight hours. The aim of the MPL is to prepare airline pilots within 18 months. This means that the MPL training is shorter than the ATPL training, with the same work area for the pilots. The MPL is the direct training path to become an airline pilot. The previous training path of an airline pilot with ATPL takes place especially in the initial phase with aircraft, equipment and procedures, with which he then as an airline pilot has nothing to do. The flight characteristics of the aircraft, on which the conventional training of airline pilots with ATPL takes place, has little to do with the later aircraft in scheduled service. For the license, 240 hours of total flight experience are required, which are completed in the simulator and on real flights. Since the ICAO does not stipulate the number of real flight hours - actual flight time - in practice there is an increase in the significantly cheaper simulator hours at the expense of the real flight hours. However, simulator lessons have a higher learning effect in many situations (TEM, CRM, in-flight emergencies, TCAS warnings and reactions, GPWS warnings, smoke and fire on board, passenger evacuation), as the situation can be stopped and errors or problems are discussed immediately and can be corrected. However, the actual flying time must at least correspond to the hourly requirements for a private pilot license plus instrument training and night flight authorization - that is about 60 to 120 real flight hours and 12 landings. The MPL students are much more likely to be trained in Crew Resource Management - CRM - and Threat and Error Management - TEM. The flight time in single-engine aircraft, especially flights that are not supervised by instructors (solo flight lessons in small aircraft), is reduced to a minimum. The MPL training is intended for student pilots without prior flying experience and pilot licenses. The MPL is intended to replace the ATPL, as it has been developed over the past 50 years, in order to meet the increasing pilot needs of airlines in a cost-effective and needs-based manner. The MPL training includes training in the Standard Operating Procedures (SOP), which are airline-specific, which is why the trainer must master the SOPs of the airline in question. An MPL license is mutually recognized by all ICAO states. The MPL is tailored to the two-man cockpit of modern commercial aircraft. As before, it is sufficient if the second pilot only has one CPL, only one pilot in the two-man cockpit needs an MPL or ATPL. MPL pilots are only allowed to fly in a one-man cockpit with restrictions (minimum flight experience - actual flight time).
MPLA	Multi-crew pilot license	see: MPL
MPP	Most probable position	Most likely location
MPS, mps	Meter (s) Per Second	Meters per second
MPS	Mission Planning System
MPW	Maximum Permitted Weight, Maximum Permitted Weight	Maximum permissible weight
MR	Medium range	Medium distance ...; medium range
MR	Maintenance release
MRA	Minimum reception altitude	Minimum reception height; lowest reception height for radio reception
MRA	Multi-role aircraft	Multipurpose aircraft
MRB	Maintenance Review Board	oversees the development of maintenance programs and now consists of specialists from the responsible authorities, operators, TCH / STCH, and the manufacturers of the systems; the MRB prepares the Maintenance Review Board Report (MRBR)
MRB	Material Review Board	Decision-making body initiated by quality management to solve material problems that have arisen
MRBR	Maintenance Review Board Report	Basis for manufacturer / operator for a maintenance program to be created
MRC	Maximum range cruise	Cruising speed that allows the greatest range
MRCA	Multi-Role Combat Aircraft	Multipurpose fighter
MRG	Medium range	Medium range
MRK	marker	Marker
MRKA		Multi-level baggage control system
MRL	Medium intensity runway edge lighting	Runway edge lighting with medium intensity
MRM	Manufacturing Resource Management	A system for the comprehensive improvement of business processes (used by Boeing ) - mostly in connection with DCAC / MRM (Define and Control Airplane Configuration / Manufacturing Resource Management)
MRO	Maintenance, repair, overhaul	Aircraft maintenance
MRI	Modified Rhyme Test	Test on military aircraft to assess the speech intelligibility of a communication system
MRVA	Minimum Radar Vectoring Altitude	Minimum radar guidance height
MRW	Maximum ramp weight	Maximum rolling weight; maximum permissible rolling weight
MS	Margin of Safety	Existing, calculated breaking load
MS	minus	minus
MSA	Minimum safe altitude	Safety Altitude , Minimum Safety Altitude
MSA	Minimum sector altitude	Sector Minimum Height; Minimum sector height (Jeppesen Airway Manual)
MSAS	M TSAT (Multifunctional Transport Satellite System) S pace-based A ugmentation S ystem	Japanese GPS (counterpart to European EGNOS )
MSAW	Minimum Safe Altitude Warning
MSB	Most significant bit	see: bit value
MSEC	Milliseconds	Milli seconds
MSG	Maintenance Steering Group	Representatives of manufacturers, airlines and legislators for the creation of maintenance programs
MSG	Message	Message, notification, message
MSI	Maintenance significant items	Identification of the parts that require maintenance; Components must have an impact on safety, lead to hidden failure or have a significant influence on economic efficiency in order to be classified as MSI
MSL	Mean Sea Level	Mean sea level (corresponds in Germany to NHN - normal height zero ); mean sea level, reference sea level; barometric altitude above sea level; mean sea level
MSME	Master of Science in Mechanical Engineering	academic degree as completion of a university education in the field of mechanical engineering
MSN	Manufacturer Serial Number	Serial number of the aircraft (for unique identification) - is assigned to each aircraft by the manufacturing company during its production (the numbering of the aircraft does not have to correspond to the sequence in which they were manufactured)
MSO	Mission Systems Operator
MSP	Maintenance Service Plan	Maintenance plan, maintenance contract
M SPD	Manual speed
MSSR-SA	Mono-Pulse Secondary Surveillance Radar Stand-Alone	Mid-range panoramic secondary radar system for route control
MST	Mountain Standard Time	( Time zone )
MSTR	master
MSU	Mode selector unit	( Boeing 747 )
MT	Magnetic Track	Magnetic course over ground
MT	Maximum top
MT	Metric tone	Ton (unit) (1 t = 2204.6 lbs)
MT	Mountain, Mount	Mountains
MT	Do trim
MT OBSC	Mountain Obscuration	Mountains in whole or in part in clouds
MTA	Military training area	Military training area
MTAT	Minimum turn-around time
MTBF	Mean time between failures	Mean distance to failure
MTBUR	Mean Time Between Unscheduled Removal	Mean time interval between the unplanned device replacement due to failure
MTCA	Minimum Terrain Clearance Altitude	Lowest ground clearance
MTCA	Military Terminal Control Area	Guarded military flight area
MTE	Manual test equipment
MTG	Miles to Go
MTHLY	Monthly	per month
MTI	Moving Target Indicator
MTMA	Military Terminal Control Area	Military section of an airport
MTN	Mountain	Mountains
MTOM	Maximum take-off mass	Maximum take-off weight (maximum take-off mass)
MTOP	Maximum take-off power
MTOW	Maximum take-off weight	Maximum take-off weight (maximum take-off weight); maximum take-off mass; Max. permissible takeoff weight; maximum take-off weight
MTR	Military Training Route	Military training track (instrument - IR, visual - VR)
MTR	Magnetic Track	Magnetic course over ground
MTS	Make trim system
MTT	Minimum time track	Flight path that leads to the shortest flight time, this is not necessarily the shortest or cheapest flight path
MTTA	Minimum time track analysis
MTTF	Mean time to failures	Mean time to failure
MTTT	Minimum turn-around time
MTW	Maximum taxi weight	Maximum rolling weight, also MALTXW (Maximum Allowable Taxi Weight)
MTWA	Maximum Total Weight Authorized	Maximum permissible total weight
MU	Management unit	( ACARS - Aircraft Communications Addressing and Reporting System)
MUFL	Minimum Usable Flight Level	lowest usable flight area
MUH	Minimum use height
MULTICOM	Self-Announcing Radio Frequency	Automatic announcement service; Radio frequency at US airfields without a control tower, FSS (Flight Service Station) or UNICOM
MUN	Municipal	urban; City-…
MUTA	Military Upper Traffic Control Area
MUX	Multiplexer, multiplex	Multiplexer (a selection switching network with which one can be selected from a number of input signals)
MVA	Minimum vectoring altitude
MVFR	Minimum visual flight rules; Marginal visual flight rules; Marginal VFR	Special VFR rules; Special visual flight rules (main cloud base between 1000 and 3000 ft. And / or visibility 3–5 SM)
MVT	Movement Control Message	Aircraft movement report
MW		Declination ( local magnetic declination )
mwK	Magnetic Track (MT)	Magnetic course over ground
mwSK	Magnetic Heading (MH)	Magnetic heading
mwN		Magnetic north
MWO	Meteorological Watch Office	Aviation weather monitoring station
MW	Master Warning	(Master warning light on glare panel) Main warning light which then prompts the pilot to search for which specific warning light has come on. He confirms the receipt of the warning by pressing the lamp, thus turning it off. The Master Warning lamp is red and also coupled with a warning tone, next to it the yellow Master Caution lamp
MWE	ManufacturerWeight Empty	Aircraft weight
MWR	Millimeter Wave Radar	Millimeter wave radar
mwSK	Magnetic Heading MH	Magnetic heading
MX	Mixed Type of Ice Formation (White Ice + Clear Ice)	Mixed ice formation (ice build-up on the aircraft) - clear ice , frost
MZFW	Maximum Zero Fuel Weight	maximum empty tank weight; Maximum empty tank weight (MZFW = Operating Weight Empty (OWE) + maximum payload)

to the beginning of the letter - M

N

(to the next letter - O) ... (to the beginning of the list)

NA , NB , NC , ND , NE , NF , NG , NI , NK , NL , NM , NN , NO , NP , NR , NS , NT , LV , NW , NX , NY , NZ

N	November	Int. Spelling Alphabet ( ICAO Alphabet )
N	North; Northern Latitude	North; north; north latitude ( compass direction )
N		Country code for aircraft with US approval (e.g. NSDF2345)
N	Negatives	negative (before negative numerical values; e.g. temperature, wind component)
N1	Low Pressure Rotor Speed, Low Pressure Rotor	Fan speed (low pressure stage = shaft 1) - expressed in Revolution Per Minute - RPM - or% of normal maximum speed. At the start, over 100% is also possible.
N2	High / Intermediate Pressure Compressor Speed, High / Intermediate Pressure Rotor	Speed ​​of gas generator (high pressure stage = shaft 2) - specified in Revolution Per Minute - RPM - or% of normal maximum speed. At the start, over 100% is also possible.
N3	High Pressure Compressor Speed, High Pressure Rotor	Speed ​​of gas generator (high pressure stage = shaft 3) - specified in Revolution Per Minute - RPM - or% of normal maximum speed. In modern airliners, 3-shaft turbines can still be found mainly in Rolls-Royce engines.
N / A	Not Authorized	Not approved, unauthorized
N / A	Not Applicable; Not Available	Not applicable; no information; Not available
NAA	National Aviation Authority
NAC	Nacelle	Turbine fairing
NACA	National Advisory Committee for Aeronautics
NACO	National Aeronautical Charting Office (FAA)
NADC	Naval Air Development Center	Trial site for naval aviators
NADP	Noise Abatement Departure Procedure	Procedure for noise protection
NAF	Naval Air Facility	Naval Aviation Facility
CLOSE	Emergency helicopter
NAI	Nacelle Anti-Ice ( Boeing 747 )	Engine air intake anti-icing system
NALF	Naval Auxiliary Landing Field
NAM	North America	North America (ICAO Region)
NAM	Nautical Air Mile	nautical miles flown; Nautical mile compared to the air (the flight route to be flown - including all smaller detours via VORs on the airway; comparable to the distance information in motorway kilometers) - results in the airdistance (in contrast to the basic distance - Nautical Ground Mile - NGM)
NAMEADSMA	NATO Medium Extended Air Defense System Management Agency
NAMEADSMO	NATO Medium Extended Air Defense System Organization
NANSC	National Air Navigation Services Company	Egyptian air traffic control
NAP	Noise Abatement Procedure	Procedure for minimizing the noise nuisance in the approach and departure areas of airfields (at takeoff: gain altitude quickly and from 1500 ft thrust reduction; for landing: configure the aircraft for landing as late as possible, landing gear and flaps extend late, as these are caused by the Turbulence generate noise and also require a greater engine thrust due to the air resistance)
NAR	North American Route
NAS	National Airspace System	National Airspace System (USA)
NAS	Naval Air Station	Naval Aviation Base (USA)
NAS-1		Russian navigation systems in aircraft that work independently of ground stations
NASA	National Aeronautics and Space Administration	US Federal Aerospace Agency
NAT	North Atlantic	North Atlantic (ICAO region)
NAT	North Atlantic Tracks	North Atlantic routes, for crossing the Atlantic; they are recreated daily; in the morning they can only be flown to the east, from noon only to the west; they start at the entry and exit points
NATCA	National Air Traffic Controllers Association	US Air Traffic Controllers Union - ousted former Professional Air Traffic Controllers Organization - PATCO
NATL	National	national
NATO	North Atlantic Treaty Organization	North Atlantic Defense Pact
NATOPS	Naval Air Training & Operating Procedure & Standard; Naval Aviation Training Operations
NAT / OTS	North Atlantic Track / Organized Track System	North Atlantic routes / route system
NATS	National Air Traffic Services	British air traffic control
NAV	navigation	Navigation ; VOR receiver ; NAV means "hold ahead" on the autopilot
NAV Canada		Canadian air traffic control
NAV Portugal		Portuguese air traffic control
NAV1, NAV2		Navigation device 1 and 2 (used to receive signals from VOR stations)
NAVAID	Navigational aid; Navigation System Using Time and Ranging	Navigation aid; (Name for the US American GPS system)
NAVSTAR	Navigation System Using Time and Ranging	Navigation system with time and distance measurement (see: Global Positioning System )
NAWAU	National Aviation Weather Advisory Unit
NAWC-AD	Naval Air Warfare Center - Aircraft Division
NB	North Bound	Flying north
NB	Narrow Body Aircraft	Airplane with a narrow fuselage
NBA		Finnish Aviation Authority
NBAA	National Business Aviation Association	US Business Aviation Association
NBCAP	National Beacon Code Allocation Plan	(UNITED STATES)
NC	No change	No changes
NCA	Northern Control Area	Northern Control Area ( Canada )
NCD	Nose Cargo Door (Cargo Code)	Bow cargo door (e.g. Boeing 747 )
NCD	No computed data
NCD	Nose cargo door
NCEP	National Centers for Environmental Prediction	National Centers for Environmental Prediction (USA)
NCFT	Non Federal Control Tower (USA)
NCRP	Non-Compulsory Reporting Point	voluntary reporting point; Non-mandatory reporting point, not mandatory reporting point (but if a report has already been made, then please above this point), air traffic control may expressly request a report at this point
NCWF	National Convective Weather Forecast (USA)
ND	Navigation display	Navigation screen (see: Multifunction-Display ) (shows: Compass rose with course information, course indicator, ground speed, ILS display) - also called Electronic Horizontal Status Indicator (EHSI)
NDB	Non directional beacon ; Non-directional radio beacon	Undirected beacon ; in the long and medium wave range (225 ... 1750 kHz) for navigation with the automatic radio direction finder ADF (Automatic Direction Finder)
NDFP	Net diftdown flight path
NDH	No damage history
NDT	Non-Destructive Testing	nondestructive material test
NE	Northeast	Northeast ( cardinal direction )
NEADS	Northeast Air Defense Sector	USA: Northeast Air Defense Sector
NEB	Northeast Bound	Flying towards the northeast
NEF	Non-essential equipment and furnishings	Equipment and furnishings in the aircraft that are insignificant for the execution of the flight
NEG	Negative; No	negative, no (e.g. TEMPS NEG ABV 24000)
NEH	Emergency medical helicopter
NEQ	Not Equal To	not equal (≠ comparison symbol )
NeSS	New SIDS and STARS
NEW	Neutral	neutral
NFCT	Non-Federal Control Tower	Non-Federal Control Tower (USA)
NFDC	National Flight Data Center
NFDC	National Flight Data Digest
NFF	Locator at Middle Marker	Near beacon
NFF	Student Pilot (Lufthansa)	Young pilot
NFH	NATO frigate helicopter
NfL		News for pilots , announcements of the relevant permits from the state aviation authorities (has nothing to do with NOTAM)
NFO	Naval Flight Officer
NFP	Non flying pilot	the non-flying pilot (identical to PNF)
NFQ	Night flight qualification
Commercial vehicles	No-flight zone	No-fly zone
NG	Next generation	z. B. Boeing 737-600 NG
NGA	National Geospatial Intelligence Agency	National Agency for Geographical Reconnaissance (USA)
NGE	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet network for PGE / P7E
NGM	Nautical Ground Mile	nautical mile from the ground - gives the ground distance (in contrast to air distance - Nautical Air Mile - NAM)
NGT	Night	night
NILE	No Item Listed; None	No information, nothing available; no points listed; no
NIMA	National Imagery and Mapping Agency (USA)
NKA	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet network for PKC
NLA	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet network for PLA / PLW
NLFS	Night Low Flying System	Night low flight system (see also: Low flight )
NLFZ		National situation and command center for security in the airspace
NLG	Nose landing gear	Nose gear ( landing gear (aircraft) )
NLML	Non-Lactose Meal (Catering Code)	Lactose-free food - see: airplane food
NLP		Emergency landing site, motorway emergency landing site, motorway makeshift airfield
NLR	Nationaal Lucht- en Ruimtevaartlaboratorium	National Aerospace Laboratory of the Netherlands
NM; nm	Nautical Miles	Nautical miles (1 NM = 1.852 km) (rarely also: nmi)
NMAC	Near mid-air collision	Near-air collision (less than 500 feet) - see: Traffic Alert and Collision Avoidance System
NMC	National Meteorological Center
NME	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet network for P1P / PAG / PAJ / PAW / PAX / P6P / PMC / PMW / PQP
nmi	Nautical Miles	Nautical miles (1 NM = 1.852 km) (mostly: NM)
NML	normal	normal
NMR	Nautical Mile Radius	In a radius of so and so many nautical miles: Example: USA - stadiums with a seating capacity of over 30,000 people must not be overflown below 3000 feet one hour before to one hour after events within a radius of 3 NMR.
NMS	Navigation management system	Navigation management system
NN	Normal zero
NNC	Non normal checklist
NNE	North-northeast	North-northeast ( cardinal direction )
NNM	Non normal maneuver
NNW	North-northwest	North-Northwest ( cardinal point )
NO	Number	Number, number
NO	No - not available	No data available - e.g. B. SLPNO (Sea Level Pressure not available), RVRNO (Runway Visual Range not available)
NOAA	National Oceanic and Atmospheric Administration	Weather and Oceanography Agency (USA)
NOAH	NO t A ustiegs H elp	Emergency exit aid for glider pilots consisting of a seat cushion that inflates with compressed air to enable emergency exit with the parachute even in adverse situations.
NOCOMM	Loss of Radio (squawk 7600)	Loss of radio contact - set transponder code 7600
NOF	NOTAM office	NOTAM office
NOGO	No go	Do not take (the flight); do not start (e.g. because of serious obstacles: weather, technical problems with the aircraft)
NOMS	Noise and Operations Monitoring System	Noise monitoring system, including permanent noise monitoring stations (e.g. 16 units at Atlanta Airport) for monitoring aircraft noise
NO OP	No operation	No function, no flight operation possible (e.g. entry in the aircraft manual - in some table fields, due to exceeding permissible limits)
NOPAC	North Pacific Route System	North Pacific route network
NoPT	No Procedure Turn Required, No Procedure Turn	no process curve (therefore a process curve should not be carried out here without ATC approval)
NORDO	Non radio aircraft; No radio	Without radio; Radio communication lost
STANDARD	normal	normal
NOS	National Ocean Service	National Oceanic and Atmospheric Administration (US weather service)
No-show		Passenger who did not show up for the flight without a cancellation
NOSIG	No Significant Weather Change	No special weather phenomena; no change within the forecast period ( Automated Terminal Information Service )
NOTAM	Notice to Airmen	Information about temporary changes in aviation
NOTARY	No tail rotor	no tail rotor (helicopter) - McDonnell Douglas NOTARY
NOTECHS	Non-technical skills	Skills of a person that go beyond simply mastering technology (cooperation, leadership, ...)
NOTOC	Notification to Captain	Information about dangerous goods on board
NOV	November	November
NOZ	Normal Operation Zone
NOZ	Nozzle	jet
NP	Neutral point	Neutral point
NPA	Notice of Proposed Amendment	From the EASA issued
NPA	Non Precision Approach	Non-precision approach
NPFO	Nominated Person Flight Operation	Designated Flight Operations Manager
NPPL	National Private Pilot's License (UK)	Private pilot license valid in Great Britain only (since 2002); divided into NPPL (SSEA / SLMG) - Simple Single Engined Aircraft and Self-Launching Motor Gliders; as well as NPPL (Microlight and Powered Parachute)
NPRM	Notice of Proposed Rulemaking
NPS	Navigation performance scales
NO	Number	Number, number
NRMLLY	Normally	usually
NRP	North American Route Program
NRR	Non-restrictive routing
NRS	Navigation Reference System	New waypoint system for Freeflight (currently only in USA)
NRS	National Route System
NRST	Nearest (waypoints)	closest
NS	Nimbostratus	Nimbostratus clouds (rain clouds)
NS	No seat
NSA	Naval Support Activity	Measure in support of the Navy
NS ABTMT	Noise abatement	Noise reduction
NSAWC	Naval Strike and Air Warfare Center
NSC	Nile Significant Clouds	No clouds below 5000 ft; no essential clouds
NSML	No Salt Meal (Catering Code)	Salt-free food - see: airplane meal
NSSFC	National Severe Storms Forecast Center
NSTD	Nonstandard	Not in accordance with the standard (e.g. marking: NSTD - if e.g. the marking of a landing threshold does not comply with the ICAO standard - e.g. HALS / DTOP or Runway 17/35 at New London Airport )
NSW	No significant weather	No (essential) weather phenomena worth mentioning
NTAB	Notices To Airmen Publication
NTC	Notice	Communication, information
NTLF		New transonic laminar grand piano
NTSB	National Transportation Safety Board	American regulator for aircraft accident investigations
NTZ	No transgression zone
NVD	Night vision device	Night vision device
N-VFR, NVFR	Night VFR	Night VFR ( night flight qualification )
NVIS	Night vision	Night vision ( night vision device )
NV-PB1U		Russian navigation systems in aircraft that work independently of ground stations
NVU		Russian navigation systems in aircraft that work independently of ground stations
NW	Northwest	Northwest ( cardinal direction )
NWB	Northwest Bound	Flying towards the northwest
NWC	Naval Weapon Center	Naval weapon base
NWOC	National Warbird Operators Conference
NWR	No weight restrictions	no weight restrictions
NWS	National Weather Service	US Weather Service - see: National Oceanic and Atmospheric Administration
NWS	Nosewheel steering	Nose wheel steering
NXT	Next	next
NYB	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet network for PYB
NZ		NOTAM headquarters

to the beginning of the letter - N

O

(to the next letter - P) ... (to the beginning of the list)

OA , OB , OC , OD , OE , OF , OG , OH , OI , OJ , OK , OL , OM , ON , OO , OP , OQ , OR , OS , OT , OU , OV , OW , OX

O	Oscar	Int. Spelling Alphabet ( ICAO Alphabet )
O	Odd (Altitude or FL)	Odd numbers (altitude or FL)
O	Oscar Open	GAFOR weather code for: ground visibility more than 8 km, (and / or) main cloud base above 2000 ft
O	(Horizontally) Opposed	Boxer engine (part of the type designation for aircraft engines - e.g. Lycoming O-540 )
O2	Oxygen	oxygen
O / A	On or About	around or around
OA	???	Designation for the front section of the aircraft cabin (the B737 divided the aircraft cabin into OA and OB; the B747 divided the cabin into OA, OB, OC, OD, OE, UD)
OAC	Oceanic Area Control
OACC	Oceanic Area Control Center
OAD	Overall aircraft design
OAG	Official Airline Guide
OAP	Overhead Annunciator Panel	( McDonnell Douglas MD-80 )
OAR	Operations Assistance Request	( Boeing 747 )
OAS	Offensive air support
OAS	Obstacle Assessment Surface	Area system to define the OCA / H or MDA / H
OASIS	Operational and Supportability Implementation System
OASIS	Online Aerospace Supplier Information System	OASIS database - records the suppliers of the aerospace and space industries that have been tested according to EN 9100
OAT	Outside Air Temperature	Outside air temperature ; Outside temperature
OAT	Operational air traffic	Operational air transport (military flights)
OATS	Orbit and Attitude Tracking
OAV	Organic Aerial Vehicle	Organic flying device (in the sense of: expanding human senses)
IF	On board	On board (e.g. TOTAL O / B = total number of people on board) (also: POB)
IF	outboard	outboard (further away from the aircraft longitudinal axis); outer (e.g. outboard engine - for aircraft with 4 engines; in contrast to inboard - I / B)
OBAWS	On-Board Aircraft Weighing System	Determination of mass and center of gravity via chassis sensors
OBC	On-board computer
OBDH	On-board data handling
OBE	Overcome By Events
OBI	Omni Bearing Indicator	automatic azimuth indicator
OBOGS	On-board oxygen generation system	a system that is used to generate oxygen
OBRM	Onboard replaceable module	(e.g. OBRM connector)
OBS	Omni Bearing Selector	Course selector button on the VOR indicator; Course selector in the NAV device (used to set a radial of a VOR station)
OBS	Observe; Observation; Observer	Observe; Observation; observer
OBS	Obstacle	obstacle
OBSC	Obscuration; Obscured; Obscuring	Fully or partially in clouds (not visible)
OBSL	Obstruction lights	Obstacle lighting
OBSN	Obstruction	Obstacle, handicap
FRUIT	Obstruction; Obstacle	Obstacle; Blocking; Obstruction
OBSTRXN	Obstruction; Obstacle	Obstacle; Blocking; Obstruction
OBT	On-board trainers
OBT	Off-block time	Blocking time
OC, O / C	On course
OCA	Obstacle Clearance Altitude	Obstacle clearance limit (indicated above sea level)
OCA	Oceanic Control Area
OCA	Offensive Counter Air
OCC	Operational Control Center
OCC	Occulting	veiling
OCCC	Oneworld Cockpit Crew Coalition	international association of national pilots' associations
OCH	Obstacle clearance height	Obstacle clearance limit, indicated by the threshold
OCL	Obstacle clearance limit	Obstacle clearance limit
OCM	Oceanic Clearance Message
OCNL	Occasional	occasionally
OCS	Oceanic Control System
OCS	Obstacle Clearance Surface
OCT	October	October
OCTA	Oceanic Control Area
OCTA	Outside Controlled Airspace	(Australia)
OCTA	eighths of the sky cloud cover	Eighth; Indication of cloudiness degree in Octa ( eighths ) - (USA) (actually no shortcut, but it looks at first glance like)
OD	Operational deviation	Irregularity, violation in flight operations
ODALS	Omni-Directional Approach Light System	Special runway lighting
ODAPS	Oceanic Display And Planning System
ODL	Opposite Direction Levels	Flying on a flight level in the opposite direction - against the semicircle flight rule ; is requested by the air traffic control pilot via radio and is often approved - e.g. B. to fly in a more optimal flight area for fuel consumption; possibly at the request of air traffic control of a neighboring district to separation distances (traffic resolution) observed
ODR	Operator Differences Requirements
ODS	Operations Display System	Air traffic controller workstation
OE	Operational error	Errors of the air traffic controllers - the graduation distances are not reached - graduation (air traffic control)
OEB	Operations engineering bulletins	( Airbus )
OEI	One Engine Inoperative	Failure of an engine (e.g. OEI Power Setting); one engine failed
OELAG	Austrian Air Transport AG	see: Austrian
OeNfL	Austrian news bulletin for pilots
OEP	Operational Evolution Plan	(USA - FAA)
OEW	Operating Empty Weight, Operator's Empty Weight, Operational Empty Weight	(see also MEW - Manufacturers Empty Weight)
OFAC	Office fédéral de l'aviation civil (Suisse)	Federal Office for Civil Aviation (Switzerland)
OFF BL	Off block	Blocking time
OFFL	Official	officially
OFIS	Operational Flight Information Service
OFP	Operational Flight Plan	Flight plan; Operational flight plan (includes all information regarding flight route, altitude, speed, time, fuel, etc.)
OFP	Operational Flight Profile
OFS	Offset	Systematic error , spatial shift, offset, shift, control deviation
OFST	Offset	Systematic error , spatial shift, offset, shift, control deviation
OFTEN	Outer fix time
OFTEN	Operational Flight Trainer
OFV	Out flow valve
OFZ	Obstacle Free Zone	Area system that must be kept absolutely free in all-weather flight operations levels CAT II and III
OGE	Operational ground equipment
OGE	Out of Ground Effect	Outside of the ground effect - see ground effect # helicopter
OGV	Outlet Guide Vane	Outlet diffuser
OH	Overhaul	Overhaul, maintenance (e.g. Auxiliary Power Unit - APU OH-Period)
OHC	Overhead camshaft	Overhead camshaft - of the top-controlled valve
OHD	Overhead
OHV	Overhead valves	Aircraft engine with overhead valves
OID	Operational Instrument Departure
OIS	Onboard information system	( Airbus 380 )
OIS	Obstacle Identification Surface	Obstacle area for calculating PDGs (Procedure Design Gradient)
OJT	On-the-job training
OK	OK	OK
OKB	(Russian) опытно-конструкторское бюро (ОКБ), ópitno-konstrúktorskoje bjuró, Experimental Design Bureau	Experimental design office
OLDI	On-line data interchange	OLDI is a Eurocontrol protocol that has similar tasks to the AIDC protocol.
OLCI	Online check-in	see check-in
OLF	Outlying Landing Field	For simulated aircraft carrier landings on land (for naval aviators)
OLR	Off-load route
OLS	Optical Landing System	Optical landing system
OILS	Austrian Aviation School
OM	Magnetic Variation (VAR)	Location dismissal
OM	Outer marker	Pre-entry sign (for an instrument landing system ).
OM	Operation Manual	Operations manual (e.g. Aircraft Operation Manual - AOM)
O&M	Operation and maintenance	Operation and maintenance
GRANNY	Operations Manual Part A	Company-specific manual for staff
OMC	Observer member of the crew	Observing member of the flight crew - e.g. As a company pilot, a check-captain, a FAA observer, a jump seat -Passagier
OMEGA		Radio navigation system OMEGA
OMI	Outer, Middle, Inner Marker	Pre, main, space entry signs
OMP	Operations and Maintenance Plan
ON BL	On block	Blocking time
ONC	Operational Navigation Chart	1: 1 million scale topographic aeronautical maps issued by the US military authorities
ONERA	Office National d'Études et de Recherches Aérospatiales	The French counterpart to NASA
ÖNfL	Austrian news bulletin for pilots
ONS	Onboard navigation system
ONS	Omega navigation system	OMEGA radio navigation system
OOOI	Out, Off, On, In	ACARS automatically sends OOOI messages (blocking time, start time, landing time, docking time)
OP	Open	Open
O / P	output	output
GRANDPA	Opaque (White Ice Formation)	Cloudy (ice) - (type of ice accumulation) ( frost )
OPAM	Operations Division Airspace Management
Grandpa	Overhead panel	( ARINC 629 system)
OPC	Operational Program Configuration
OPC	Operators Proficiency Check	(Similar to the LPC - Line Proficiency Check)
OPMET	Operational Meteorological Information	Flight meteorological data
OPN	Open; Opening; Opened	open, open, open
OPR	Operator; Operate; Operative	Holder ; Operator; operate; in operation
OPR HRS	Operational Hours	Operating time; Opening time
OPRN	surgery	business
OPRTNS	Operations	business
OPRTS	Operators	operator
OPS	Operations	Business; Flight operations; opening hours
OPS	Operations Office	Aircraft Handling Department
OPS	Obstacle protection surface	Obstacle free area for a PAPI system
OPS	Operational Program Software
OpSpec	Operations Specification
OQAR	Optical Quick Access Recorder	Optical Quick Access Recorder - QAR - optical data recorder
O / R	On request	on request (e.g. flight director, customs) (example: AVBL O / R - available on request)
ORAP	Reconnaissance Regiment (Soviet / Russian Air Force)
ORCA	Oceanic Route Clearance Authorization Service
ORCAM	Origination Region Code Assignment Method	Method of fixed code allocation by air traffic control (transponder code)
ORGMSG	Original message
ORGRTE	Original route
ORM	Operational Risk Management
ORML	Oriental Meal (Catering Code)	oriental chinese food (chinese style) - see: airplane food
ORI	Operational Readiness Inspection
OROCA	Off Route Obstruction Clearance Altitude
ORTCA	Off Route Terrain Clearance Altitude
O / S	Out of service	Out of service
OShAP	Ground Attack Regiment (Soviet / Russian Air Force)
OSO	Offensive system officer	Crew member of a fighter aircraft who is responsible for the weapons systems, similar to the weapons systems officer
OSS	Occupant Safety and Survivability	Occupant safety
OSTIV	Organization Scientifique et Technique Internationale du Vol á Voile	International organization for science and technology in gliding
OSV	Oceanic Station Vessel
OT, O / T	Other Times	At other times
OTAR	Over the air re-keying
OTCH	End of Overrun Crossing Height	Passing altitude at the end of the roll-over distance
OTLK	Outlook	Weather forecast
OTP	On top	Above the cloud ceiling
OTR	Oceanic Transition Routes
OTS	Organized Track System	see: NAT / OTR
OTS	Out of service	Out of service
OUBD	Outbound	Flying away
OUR	Operational Users Requirement
OUTB	Outbound	flying away
OUTBD	Outbound	flying away
OUTBD	Outboard	outboard, outboard
OVBD	Overboard	Over board; outwards
OVC	Overcast	Closed cloud cover ; Cloud cover 8/8; cloudy
OVFT	Overflight	Overflight
OVHD	Overhead	over; about that
OVHD	Overhead panel	Overhead panel
OVHT	Overheat	Overheating
OVPRESS	Overpressure	Overpressure
OVRD	Override	take control of the automatic system; oversteer; overcome, do not consider; overrule; bridge; cancel, override
OVRHD	Overhead	over; about that
OVRN	Overrun
OVSP	Overspeed	Too high speed
OVU	Overhead electronic unit
OW	Operating Weight	Basic operational weight including fuel
OWE	Operational Weight Empty	Operating empty weight of the aircraft (MWE + permanently installed additional equipment)
OX	Oxygen	oxygen
OXY	Oxygen	oxygen

to the beginning of the letter - O

P

(to the next letter - Q) ... (to the beginning of the list)

PA , PB , PC , PD , PE , PF , PG , PH , PI , PJ , PK , PL , PM , PN , PO , PP , PQ , PR , PS , PT , PU , PV , PW , PY , PZ

P	father	Int. Spelling Alphabet ( ICAO Alphabet )
P	Prohibited Area (followed by identification)	Restricted area - e.g. B. LE-P 71A = restricted area in Spain (LE)
P	Positive	positive (before positive numerical values, e.g. temperature or wind component)
P	Panel	(e.g. P3 = panel 3)
P	Pressure change, delta pressure	(see: pressurized cabin )
PPR	Prior Permission Required	Requires prior approval
ΔP	Differential pressure; Delta P	(see: pressurized cabin )
P factor	P-factor	asymmetrical effect on the propeller
PA	Pressure Altitude	Pressure height (see: density height )
PA	Precision approach	Precision Approach
PA	Passenger announcement, Public Address, Passenger Address	Passenger notification; Announcement (of the pilot) for the passengers
PAC	Pacific	Pacific (ICAO region)
PACAF	Pacific Air Forces
PACOTS	Pacific Oceanic Track System
PACT	Precision Aircraft Control Technology
PAD	Passenger Available For Disembarkation	Passenger without a booking entitlement; Paxes on waiting list; Airline employees who travel privately with a stand-by ticket and are only taken along if seats remain free.
PADRA	Pass to Air Defense RADAR	Pass (the flight plan) on to the air defense radar control
PAG	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
PAJ	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
PAJA	Parachute jumping	Skydiving
PAL	Pilot Activated Lighting	Pilot side activated firing (at least 2 seconds holding the microphone button of radio is the firing for about 30 minutes enabled)
PALCS	Passenger Address Level Control Sensor
PAL / PCL	Pilot Activated Lighting / Pilot Controlled Lighting	Pilot side-activated lights
PAN-PAN	Emergency Call (without imminent danger)	With (3 x) "PAN-PAN" an urgency message is initiated in the voice radio ; PAN goes back to the French word panne (not really an abbreviation, but at first glance it looks like it)
PANS OPS	Procedures For Air Navigation Services Operations	Procedural rules for navigation and procedures
PANS OPS	Procedures For Air Navigation Services - Training	Procedural rules for pilot training
PAOC	Police Air Operator's Certificate (UK)
PAOM	Police Air Operations Manual (UK)
PAP	Paying Passenger	Paying passenger; Full payer
FATHER	Parallax Aircraft Parking Aid	Parking guidance system
PAPI	Precision Approach Path Indicator	Precision slip angle lighting
PAPP	RNAV Precision Approach Path Points
PAR	Precision Approach Radar System	Military precision approach radar - example: PAR-80
PAR	Preferential Arrival Route
PAR	Parallel	parallel
PARA	paragraph	paragraph
PARC	Performance-Based Operations Aviation Rulemaking Committee
PARL	Parallel	parallel
PARROT	Position Adjustable Range Reference Orientation Transponder
PAS	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - heavy duty pallet
PAS	Passenger Address System	Announcement system (of the pilot) for the passengers
PAS	Protective Aircraft Shelter	(also: Hardened Aircraft Shelter - HAS) Aircraft bunker
PASSPORT	Passenger	passenger
PAT	Pattern	Traffic pattern , pattern
PATA	Poland Air Traffic Agency	Polish air traffic control
PATC	Precision Approach Terrain Chart	Precision ground profile map (only for CAT II / III during the ILS approach)
PATCO	Professional Air Traffic Controllers Organization	Former US air traffic controllers' union - now ousted by the National Air Traffic Controllers Association - NATCA
PATWAS	Pilots Automatic Telephone Weather Answering System	Telephone weather briefing in the USA - from an automatic tape announcement - mostly for the local weather within a radius of 50 NM
PAW	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet with side extension
PAX	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
PAX	Passenger	Passengers ; Passenger - is calculated as a load of 95 kg including luggage. Airbus calculates with 91 kg / PAX for short-haul flights and Boeing with 200 lb / PAX for the two-class seat configuration and 210 lb / PAX for the three-class seat configuration (see: booking class )
PAX (A / C / I)	Passenger (Adults / Children / Infants)	Passengers (adults / children / babies)
PB	Pushbutton	Push button
P / B	Pushback	Rolling back the aircraft by a tug
PBB	Passenger boarding bridge	Passenger boarding bridge
PBCS	Performance-based communication and surveillance
PBCT	Proposed Boundary Crossing Time
PBD	Place bearing distance	Place - direction - distance
PBE	Personal breathing equipment; Protective Breathing Equipment	Breathing equipment (breathing mask - for flight crew); Personal breathing equipment
PBIT	Power up built in test
PBN	Performance based navigation
PB / PB	Place Bearing / Place Bearing	Place - direction / place - direction
Pc	Protocol	protocol
Pc	Personal computer	Personal computer
PCA	Power Control Actuator	Actuator with force control
PCA	Pre-Conditioned Air	Air conditioning system that transfers conditioned air to the aircraft at the passenger boarding bridge
PCATD	PC based Aviation Training Device	PC-based instrument flight trainer
PCC	Pilot Competency Check
PCD	Proceed; Proceeding	procedure; Procedure
PCE	Pieces	Pieces, number, pieces of luggage (Load Manifest: WEIGHT PCE - total weight of pieces of luggage)
PCFA	Person Carrying Firearms	Passenger armed with a firearm
PCI	Pavement Condition Index
PCK	Package (Cargo Code)	pack
PCKGRP	Package Group (Cargo Code)	Packing group
PCL	Pilot controlled lighting; Precision Pilot Controlled Runway Lighting	RWY lighting that can be switched on with a special COM frequency (click 7 × within 5 s on the published frequency - switches on the strongest light intensity; 5 × click = medium light intensity; 3 × click = weakest light intensity or light off; in uncontrolled places - USA; e.g. goes out automatically after 15 minutes)
PCM	Pulse Coded Modulation
PCM	Pitch Change Mechanism
PCN	Pavement Classification Number	Capacity classification number (of the runway )
PCR	Pavement Classification Rating
PCP	Pilot call panel
PCPN	Precipitation	Precipitation
PCS	Propulsion Control System	( Boeing 737 NG) - protects, among other things, the engines when the engine is started (automatically monitors the abort criteria for engine start) - these protective mechanisms are switched off when in-flight starts; prevents engine damage in the event of "abnormal ground engine start"
PCT	Percent, percentage	percent
PCU	Passenger Control Unit
PCU	Power control unit
PCZ	Positive control zone
PD	Pilot deviation	FAA: errors by a pilot that violate Federal Aviation Regulations.
PDAR	Preferential Departure and Arrival Route
PDC	Performance Data Computers	Performance data computer - part of the Flight Management System (FMS)
PDC	Pre-departure clearance
PDG	Procedure Design Gradient	Climb Gradient for a Standard Instrument Departure Procedure (SID) - The normal gradient is 3.3% for fixed-wing aircraft. A deviating value of the gradient is published with the respective procedure.
PDI	Pictorial Deviation Indicator
PDM	Passenger Departure Manifest
PDM	Possible double message
PDP	Pre-determined point procedure	some kind of alternate airfield
PDP	Planed Descent Point
PDP	Pneumatic Duct Pressure	Air pressure in the pneumatic system (bleed air, packs, pressurized cabin )
PDR	Preferential Departure Route
PDR	Pre-Determined Route
PDS	Primary display system
PDST	Pedestal	Center console
PDT	Pacific Daylight Time
PE	Position error	Position error
PE	Ice pellets	Ice grains (weather key for METAR and TAF )
P7E	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - 20 foot pallet
PEA	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - half pallet
PEC	Personal Equipment Connector	Breakaway coupling on the ejection seat
PED	Portable electronic device; Personal electronic device	Portable electronic consumer devices - cell phones, laptops, CD players, etc., which are prohibited to operate for reasons of flight safety (especially during take-offs and landings).
PEF	Plants and Plant Products (Cargo Code)	Plants and plant products
PEM	Meat and Meat Products (Cargo Code)	Meat and meat products
PEM	Performance Engineer Manual
PEM	People with reduced mobility	English Persons with reduced mobility (PRM)
PEP	Peak envelope power
BY	Perishable Goods (Cargo Code)	Perishable cargo
PERF	performance	Power (of the aircraft, the engines)
PERF INIT	Performance initialization	a page in the flight management computer (Boeing)
PERM	Permanent	permanent; continuously; z. B. Duration of validity of a NOTAM - Notice to Airmen
PES	Passenger entertainment system
PES	Fish and Seafood (Cargo Code)	fish and seafood
PET	Point of Equal Time	Point of the same time (also called ETP - Equal Time Point) For ETOPS flights, the point between two ETOPS alternates at which the flight time to the two airports is the same. After skimming the PET, the next following alternate, which is entered after the PET, must be selected if necessary; if the engine fails (1X) there is another PET (PET 1X); PET DC applies when the cabin is decompressed; PET DX applies to decompression and a failed engine
PET 1X		see: PET
PETC	Pet in Cabin	Traveling pet (up to 6 kg) in the cabin of a passenger plane
PET DC		see: PET
PET DX		see: PET
PF	Pilot flying	The controlling pilot (regardless of who is Pilot In Command - PIC)
PFC	Primary flight computer	( Boeing 777 )
PFC	Porous Friction Courses
PFCS	Primary Flight Control System
PFD	Primary flight display	Primary flight display - see: Multifunction Display ; Main display in the aircraft (shows: attitude, altimeter, rate of climb, course indicator, speedometer); also called Electronic Attitude Display Indicator (EADI)
PFE	Professional flight engineer	Flight engineer (mostly for airframe and engine - A & P)
PFJ	Polar front jet	Polar front jet stream; polar jet stream (80–2000 kt; in FL 300–350; 60 ° N in summer; 45 ° N in winter)
PFL	Planned flight level	Planned flight level
PFL	Practice Forced Landing	Emergency landing exercise
PFM	Pre-flight message
PG	page	page
PGE	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - 20 foot pallet
PGM	Program	program
PH	Pilot handbook	Pilot manual
PHPL	Private Helicopter Pilot License	Private helicopter license - see: Private pilot license
PI	Performance inflight	( Boeing )
PI	Previously Incorporated
PI	Paint & Interior
PIB	Preflight Information Bulletin	Flight advice bulletin (prepared before departure)
PIC	Pilot in command	Responsible pilot ; responsible pilot ; commander
PIC	Pilot in charge	Responsible pilot ; responsible pilot ; commander
PICUS	Pilot In Command Under Supervision	A pilot who independently controls an aircraft, but who z. B. because he lacks the appropriate license, flies with a special flight assignment (training flights)
PID	Product Identification Number
PIH	Pilot's Information Handbook
PIM	Pilot's Information Manual	Airplane manual for the pilots - also called the Pilot's Operating Handbook (POH)
PIP	Production Improvement Package	( Boeing )
PIR	Precision Instrument Runway
PIREP	Pilot Report , Pilot Weather Report	Pilot weather report (from the flying aircraft)
PISTON	Piston aircraft	Piston-powered aircraft (as opposed to jet engines - JET)
PJA	Parachute jumping area, drop zone	Area for skydiving
PJE	Parachute jumping exercise	Parachute jump exercise
PKC	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet with side extension
PKM		Passenger kilometers
PK	park	park
PK	Peak	top
PK WND	Peak wind	Wind force peaks (USA)
PKO	Passenger Kilometers Offered	Passenger kilometers
PKT	Passenger kilometers
PL	Power lever; Throttle; Thrust lever	Throttle , throttle
PLA	Practice low approach	Practice approach in low flight
PLA	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet with side extension
PLASI	Pulse Light Approach Slope Indicator	Special runway lighting ( lighting )
PLB	Personal Locator Beacon	Emergency beacon - PLB is for people while EPIRB is for distress at sea and ELT is for aircraft
PLD	Portable load device
PLI	Pitch Limit Indicator
PLN	plan	Flight schedule in Electronic Flight Instrument System - EFIS - represent
PLNLAW	Planned Landing Weight	Planned landing weight
P-LNS	Power lines	High voltage lines
PLNTOF	Planned Take Off Fuel	Calculated amount of fuel at the time of departure (the fuel for starting and taxi has already been burned by then)
PLNTOW	Planned Take Off Weight	Calculated takeoff weight
PLNZFW	Planned Zero Fuel Weight	Calculated weight without fuel but with payload; planned empty tank weight; planned starting weight
PLT	pilot	pilot
PLW	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet with side extension
PLW	Performance Landing Weight	maximum permissible flight performance-limited landing weight
PM	Pilot monitoring	Observing pilot - was formerly known as Pilot Non Flying (PNF; non-flying pilot) - the counterpart to Pilot Flying (PF)
PMA	Permanent magnet alternator	(see: Alternator , Alternator , Electric Generator )
PMA	Parts Manufacturing Approval	Authorization to manufacture spare parts / replacement devices
PMAT	Portable Maintenance Access Terminal
PMC	Power management control	( Boeing - controls the engine thrust and the position of the thrust lever)
PMC	Performance management computer
PMC	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
PMCU	Passenger Medical Clearance Unit	Department for medical advice for passengers - regarding their fitness to fly (e.g. at British Airways )
PMG	Permanent magnet generator	(see: DC machine , AC generator , alternator , electric generator )
PMI	Principal Maintenance Inspector
PMP	Pump	pump
PMS	Performance Management System	Provides commands for pitch and thrust to the Digital Flight Guidance System (DFGS)
PMS	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - heavy duty pallet
PMUX	Propulsion Multiplex Unit (on Engine)	( Boeing 747 )
PMW	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - pallet with side extension
PN	Prior Notice Required	prior notification required
PN	Part Number	Part number
PND	Primary navigation display	primary navigation screen ( Boeing 747 )
PNEU	Pneumatic	pneumatic
PNF	Pilot Non Flying	the non-flying pilot - is now called Pilot Monitoring (PM) - the counterpart to Pilot Flying (PF)
PNdB	Perceived Noise in Decibel	Perceived volume in decibels
PNI	Pictorial Navigation Indicator
PNL	Panel	Control panel
PNR	Passenger Name Record	Passenger Name Record
PNR	Prior Notice Required	Prior notification required
PNR	Point of no return	Last turning point; Point of the last possibility of turning back
PO	Dust / Sand Whirls (Dust Devils)	Sand / dust vortex ( dust devil )
PO	Outside air pressure
POB	Persons on board	Number of people on board (also: O / B)
POC	Private Operator Certificate
POEMS	PreOperational European Mode-S	Test radar stations operated by Eurocontrol before the introduction of Mode-S as the standard for secondary radar devices
POI	Principal Operations Inspector
POH	Pilot's Operating Handbook	Airplane manual for the pilots - also known as the Pilot's Information Manual (PIM)
POLE	Petrol, Oil and Lubricants	Fuel , engine oil and lubricants
POR	Power on reset
POS	position	Location
POSN	position	Location
POST OFFICE	Pilot Optimized Speed ​​Task	Pilot-optimized speed task
POSS	Possible	possible
POT	Potentiometer	Potentiometer
PP	Preepais (Cargo Code)	The sender pays the delivery fee
P1P	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
P6P	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
PPA	Pilot's personal assistant	Data processing system and memory for the pilot tasks
PPC	Powered parachute	Motorized parachute ; Paramotor
PPC	Pilot Proficiency Check
PPC	Patrol Plane Commander
PPC	Pre-pay check	Sales inspection
PPCP	Patrol Plane copilot
PPG	Powered paraglider	Motorized paraglider ; Paramotor
PPH	Pounds per hour	Pounds per hour (fuel consumption)
PPI	Plan Position Indicator	Panoramic display device; Dual screen showing the aircraft position in side and top view
PPL	Private pilot license	Private pilot license
PPL-A	Private Pilot License (Motor)	Permission for private pilots - see: Private pilot license
PPL-B	Private Pilot License (Motorglider)	Permission for motor glider pilots - see: Private pilot license
PPL-C	Private Pilot License (Glider)	Permission for sailplane pilots - see: Private pilot license
PPL-D	Private pilot license	Permission for free balloon pilots - see: Private pilot license
PPL-E	Private Pilot License (Helicopter)	Permit for private helicopter drivers - today PPL-H
PPL-H	Private Pilot License (Helicopter)	Permission for private helicopter operators - formerly PPL-E
PPLI	Precise Position Location Indicator
PPL-N	Private Pilot License (National)	Permission for private pilots - maximum weight 750 kg, single-engine aircraft approved for a maximum of 2 people
PPNC	Patrol Plane Navigator / Communicator
PPO	Prior Permission Only	Only with prior approval (e.g. at a private airfield)
PPR	Prior Permission Required	prior approval required
PPS	Precise Positioning System
P-RNAV	Precision Area Navigation	Precision area navigation - the aircraft may have a maximum storage (position accuracy) of ± 1 NM (1.85 km) - Area Navigation - B-RNAV is not as accurate
PROB	Probability	Probability (weather key for METAR and TAF ) - only 30% or 40% is used; if more likely: BECMG - becoming; with low probability - SPEED - temporarily
PPOS	Present position	Current location
PPP	Patrol Plane Pilot
PPR	Prior Permission Required	Requires prior approval
PPS	Precise Positioning Service	Part of the Global Positioning System (GPS) - accuracy: 22 m horizontally, 27.7 m vertically - more precise than the Standard Positioning Service (SPS)
PPTC	Patrol Plane Tactical Coordinator
PQP	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - pallet
PR	Partial	Partly (weather key for METAR and TAF )
PR	Preferred routes	Preferred routes
PR	Pressure	pressure
PRECIP	Precipitation	Precipitation
PRED	Predefined route	Predefined route (were created to make the work of the dispatcher / flight dispatcher easier)
PRED	Prediction	forecast
PRESFR	Pressure falling	Falling air pressure
PRESRR	Pressure rising	Rising air pressure
PRESS	Pressure	pressure
PREV	Previous	previous
PRF	Profiles	Profile (e.g. on the autopilot : SPD PRF - descending or climbing flight at constant speed)
PRF	Pulse Repetition Frequency	Pulse repetition rate - radar
PRFG	Aerodrome partially covered by fog (partially fog)	Airport partly fog covered
PRGM	Program	program
PRI	Primary	(e.g. ENG PRI - Engine Primary)
PRI	Pulse repetition interval	Pulse Repeat Interval - Radar
PRIM	Primary	primary
PRK	park	Park
PRKG	Parking	Park
PRLL	Parallel	parallel
PRM	Passengers with Reduced Mobility	Passengers with restricted mobility, see viennaairport.com (PDF file; 140 kB)
PRM	Precision Runway Monitor	System for the early detection of flight path deviations of approaching aircraft
PRMG	Soviet Instrument Landing System	Russian instrument landing system
PRML	Low Purine Meal (Catering Code)	Low-purine food - see: Airplane food
PRMSSN	Permission	Approval
PRN	Pseudo random noise	Characteristic GPS satellite signal that appears randomly
PRNAV	Precision RNAV, Precision Area Navigation	Precision area navigation (will replace RNP-RNAV - Required Navigation Performance - Precision Area Navigation ) PRNAV will optimize the approach and departure routes, as it enables navigation in the local traffic area of ​​airports (independent of ground-based facilities - e.g. radio beacons)
PROB	Probability	Probability (only 30% and 40% are used in the weather key)
PROC	Procedure	Procedure
PROG	progress	Progress, advancement
PROH	Prohibited	forbidden
PROJ	Projection	projection
PROP	Propeller aircraft	Propeller aircraft - see: Motor aircraft
PROT	Protection	Protection (e.g. fire prot)
PROV	Provisional	provisionally
PROX	Proximity	Proximity
PRSOV	Pressure Regulating and Shutoff Valve	Pressure regulation and shut-off valve
P / RST	Push to reset	Press (button) - for a system restart (e.g. A / TP / RST; A / PP / RST; FMC P / RST)
PRT	Power Recovery Turbines
PRV	Pressure Relief Valve	Pressure relief valve (also on the pressure cooker )
PRV	Pressure Regulating Valve	Pressure regulating valve
PS	plus	plus
PS	Horse Power (HP)	Horsepower
P / S	Pitot Static	Pitot static system
PSBL	Possible	possible
PSC	Preset Course	Presetting the course
PSC	Performance Seeking Control
PS&D	Plans, Scheduling and Documentation
PSEU	Proximity Switch Electronic Unit	Proximity switch - electronic unit; reports the position or status of a system component: e.g. B. flaps , landing gear , doors; In the case of the B737 NG, the PSEU controls: the take-off and landing configuration warning, the landing gear transfer valve, the landing gear position indicator and warning, warning when the speed brakes are deployed
PSG	Passing	happen, flyby
PSGR	Passengers	Passengers
PSH	Preset heading	Presetting of flight direction (current course)
PSI	Pounds per square inch	Pressure unit
PSIG	Pounds per square inch gauge, pounds per square inch gage	Pressure gauge that measures in PSI units; PSIG and PSI are used interchangeably for the unit of measurement of pressure - e.g. B. the pressure at the outlet of a turbine
PSM	Procedures Specification Manual
PSM	Passenger Service Message	Information about people on board, e.g. B. WCH, MAAS etc.
PSN	position	Location (example: parking PSN)
PSN	Packet Switched Network
PSP	Pierced Steel Plank (s)	Stahlrostplatte (n)
PSR	Primary Surveillance Radar	All-round primary radar
PSR	Point of Safe Return	Point at which a safe turnaround is possible
PSR	Packed Snow on Runway
PSS	Passenger Service System	( Boeing 747 )
PST	Pacific Standard Time	( Time zone )
PSU	Passenger Service Unit, Passenger Overhead Panel	Control panel above each passenger seat (light, air, call button, oxygen masks, recently also the life jackets on some aircraft models and airlines)
PSX	Passenger	Passengers ; Passenger - is calculated as a load of 93 kg including luggage; PAX is much more common
PSYS	Pressure Systems	Printing centers (location and fronts, as well as expected development)
PT	Procedure turn	Process curve ; Standard process curve (with this curve, a 180 ° curve takes exactly one minute; a 360 ° circle - 2 minutes. The turn coordinator shows the correct incline. The corresponding wing tip must point exactly to the "R" or "L" mark)
PT	Point	Point, position
PT2, PT 2	Engine inlet pressure	Engine inlet pressure ( Boeing 747 )
PTC	Pack temperature controller	( Air conditioning (airplane) )
PTH	Path	path
PTH	Pitch	Nod (around the transverse axis ); Rotation of the aircraft around its transverse axis (the raising and lowering of the aircraft nose) (see: Flight maneuvers )
PTL	Turbo prop engine	Propeller turbine air jet engine (also known as turboprop for short )
PTM	Passenger Transfer Message	Information about onward flights from PAX on board
PTMS	Power Thermal Management System
PTN	Procedure turn	Process curve
PTO	Please turn over
PTO	Part time operation	Only in operation temporarily
PTOT	Provisional take-off time	Preliminary start time (in the Central Flow Management Unit - the flight movement coordination of ECAC in Brussels)
PTOW	Planned Takeoff Weight
PTOW	Performance Take-Off Weight	Maximum take-off weight with a limited flight performance
PTP	Point-To-Point (Operations)
PTS	Pitch Trim System	Trimming the elevator against high load
PTS	Practical Test Standards	Minimum requirements for the practical flight test
PTS	Polar Track Structure
PTT	Press-to-talk (button or switch), push-to-talk	press and speak (switch)
PTTN	Pattern	Template; Traffic pattern
PTU	Power transfer unit	The PTU is a hydraulic emergency supply system that provides power transmission between two separate hydraulic circuits
PTV	(Individual) Passenger TV	Individual television for passengers
PUF	P ilot u nd F lugzeug	Abbreviation for the magazine published in Germany for the GA (General Aviation) called “Pilot und Flugzeug”. Former editor-in-chief was Heiko Teegen, who had a fatal accident in a motorcycle accident.
PURE	Purser	Cabin chief
PV	Priority Valve
PVASI	Pulsating Visual Approach Slope Indicator	Pulsating glide angle lighting
PVGI	Pulsating Visual Glidescope Indicator	Pulsating glide angle lighting
PVD	Paved	paved
PVD	Paravisual display	(For low-visibility take-off Boeing 747 )
PVMNT	Pavement	paving
PVT	Private; Private operator	Private; private operators
PW	Pratt & Whitney	Turbine manufacturer (e.g. PW 610 F engine)
PWI	Proximity Warning Indicator	Proximity warning system similar in function to the Ground Proximity Warning System - possibly with an optical sensor
PWR	power	Performance ; Force ; energy
PWR MGT	Power management
PWS	Predictive Windshear System	Wind Shear Prediction System
PY	spray	Slight impairment of visibility due to precipitation (weather code for METAR and TAF )
PYP	Unit Load Device (ULD)	IATA ID code for a specific type of air freight container - Q-pallet (only for Boeing 747)
PZA	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - 16-foot pallet

to the beginning of the letter - P

Q

(to the next letter - R) ... (to the beginning of the list)

QA , QC , QD , QE , QF , QH , QM , QN , QP , QQ , QR , QT , QU , QV , QZ

Q	Quebec	Int. Spelling Alphabet ( ICAO Alphabet )
Q	QNH	(e.g. Q1036 = 1036 hPa; for US figures in inches Mercury, A is used instead)
QA	Quality assurance	quality control
QAD	Quick Attach Detach
QAP	Quality Assurance Plan	Quality assurance plan
QAR	Quick Access Recorder	Data recorder; Supplement to Flight Data Recorder (FDR) and Cockpit Voice Recorder (CVR), not crash-proof, but can be read directly with a laptop after an incident
QC	Quick Change (Aircraft)	Rapid conversion (of cabin equipment) - commercial aircraft that can be used for passenger, cargo or mail transport by quickly converting the cabin equipment
Q-CLB	Quiet climb	noise-reduced climb
QD	Quick donning
QDM	Magnetic Heading (no wind)	Magnetic heading (with wind force 0) to the station; Magnetic compass heading from the aircraft to the beacon. QDM is displayed directly from the RMI
QDR	Magnetic bearing	Magnetic bearing from a ground transmitter to an aircraft
QDR	Quality Defect Report
QDR	Quality Deficiency Report
QEC	Quick engine change
QEC	Quick Engine Change Unit
QEC	Quadrantral Error Corrector
QFA	Route Weather Forecast	Route weather forecast
QFE	Local station pressure ; Height Above Airport; Field elevation; Pressure at Aerodrome Atmospheric pressure at aerodrome elevation (or at runway threshold); Atmospheric Pressure at Aerodrome Elevation (or at runway threshold) in the USA only subscale setting	Air pressure at seat height; Air pressure setting on the altimeter at the height of the place; Height above airfield; Air pressure at airport level (or at the runway threshold) (article: flight level ); QFE is the air pressure value that has not been reduced to court level. This shows the height above ground (at the airfield). The QFE setting only applies in the vicinity of the seat. In contrast to QFE, the QNH setting shows the altitude above MSL (NN).
QFF		Air pressure, using current weather values, reduced to sea level
QFG		As a question: Am I over your station? In response: you are above my station.
QFH		As a question: Can I sink under the clouds? The answer: You can sink under the clouds.
QFO		As a question: Can I land immediately? The answer: you can land immediately.
QFR		As a question: does my landing gear appear to be damaged? In response: your landing gear appears to be damaged.
QFU	Magnetic Orientation of Runway In Use	Magnetic direction of the runway; Orientation of the active runway relative to the magnetic meridian ; Magnetic direction of the runway; Magnetic runway direction
QHI	Qualified Helicopter Instructor
QM	Quality management	Quality management
QMP	Quality Management Plan	Quality management plan
QMS	Quality Management System	Quality management system
QNE	Altimeter setting	Height at standard pressure (STD); QNE is the standard air pressure (1013.25 mbar) that is used from the transition level (TRL) so that the flight areas are the same in all aircraft
QNH	Altimeter Setting; ASL Altitude; in the USA only subscale setting; Atmospheric pressure reduced to MSL by ICAO Standard Atmosphere and Altimeter sub-scale setting to obtain aerodrome elevation when on the ground. The barometric pressure as reported by a particular station	Altimeter setting - air pressure at the airfield, based on sea level; Air pressure setting on the altimeter to converted sea level; Altitude above sea level; Air pressure reduced to sea level with ICAO standard atmosphere and scale setting on the altimeter so that the airport altitude is displayed when landing; Air pressure, using the values ​​of the ISA reduced to sea level (article: altitude )
. QOP	Quality Operating Procedures
QOS	Quality of Service
QP	Quality Procedure
QPM	Quality Policy Manual
QRA	Quick Reaction Alert
QRC	Quick Reference Checklist ; Quick Reaction Checklist	Quick checklist for emergencies
QRG	Quick Reference Guide
Q route		Name for RNAV routes in the USA
QRH	Quick Reference Handbook	Quick start Guide; Extract from the operating manual
Q key	Aviation radio abbreviation
QSM	Quality Safety Manager
QSR	Quality Safety Requirement
QT	Qualification test
QTA	Cancel	to brush
QTE	Line of Position (true); True bearing from a station	Legislative radio stand line; right direction from the station
QTG	Qualification Test Guide
QTI	Quantity (Cargo Code)	amount
QTY	Quantity	amount
QTRS	Quarters
QUAD	Quadrant, Quadrantal	quadrant
QUJ	True bearing to a station	True bearing ; direction to the station
QVL	Qualified Vendor List
QZSS	Quasi-Zenith Satellite System

to the beginning of the letter - Q

R.

(to the next letter - S) ... (to the beginning of the list)

RA , RB , RC , RD , RE , RF , RG , RH , RI , RK , RL , RM , RN , RO , RP , RQ , RR , RS , RT , RU , RV , RW , RX , RZ

R.	Romeo	Int. Spelling Alphabet ( ICAO Alphabet )
R.	Radial	Radial (heading from a VOR station to an aircraft, corresponds to the QDR)
R.	radar	Radar; ATC RADAR (see: Air Traffic Control )
R.	Right (runway identification)	Right ( runway designation)
R (+ number)	Red (or Romeo)	Red airway (+ number)
R.	Restricted area (followed by identification)	Restricted flight area (followed by a more detailed description) - see also: No-fly zone
R E	Reynolds Number	Reynolds number
RA	Radio altitude; Radar Altitude	Radar altitude; Height above ground measured with a radar altimeter
RA	Radio altimeter	Radar altimeter
RA	Resolution Advisory	Alternative recommendation (from TCAS )
RA	Rain	Rain (weather key for METAR and TAF )
RA	Risk Analysis
RA4	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - cooling igloo
RAA	Remote Airport Advisory	The service station is not stationed at the landing site, but has its own ground-to-air frequency or tower frequency (while the tower is closed) - u. a. automatic weather reports
RAA	Recreational Aviation Australia	Formerly the Australian Ultralight Federation (AUF), the umbrella organization for ultralight pilots in Australia
RAA	Regional Airline Association
RAAF	Royal Australian Air Force	Australian Air Force
RAAS	Runway Awareness and Advisory System	(Boeing B777)
RA-Off	Recreational Aviation Australia	formerly the Australian Ultralight Federation (AUF), the umbrella organization for ultralight pilots in Australia
RABFAC	Radar Beacon Forward Air Controller
RABS	Reverse Actuated Bleed Air
RAC	Rules Of The Air And Air Traffic Services	Air Traffic Rules and Air Traffic Services - AIP RAC
RACON	Radar beacon
WHEEL	Radar; Radar control	radar
WHEEL	Radius, radial	within a radius (e.g. from 5 nm)
WHEEL	radio	Wireless
WHEEL	Route Availability Document	Airway resource planning document (another name for Traffic Orientation Scheme - TOS)
radar	Radio detection and ranging	Literally: radio detection and distance measurement
RADAY	Radio Day
RADC	Regional Air Defense Commander
RADINT	Radar Intelligence
RADNET	Radar Data Interchange Network	Network of radar systems
RADZ	drizzle	drizzle
RAE	Royal Aircraft Establishment	British air carrier
RAeS	Royal Aeronautical Society	global institution that deals with the diverse aspects of aerospace
RAF	Royal Air Force	British Air Force
RAFC	Regional Area Forecast Center	Regional area forecasting center
RAFIS	Radar-Assisted Flight Information Service	Military radar flight information is used e.g. B. for polygons
RAGF	Remote air-ground facility
RAI		Italian Aviation Authority
RAIL	Runway Alignment Indicator Lights	Side row lighting
RAIM	Receiver Automodus Integrity Monitoring	Automatic receiver for self-monitoring of GPS devices (the system built into the receiver checks the integrity of the GPS transmitters)
RAIM FD	Receiver Autonomous Integrity Monitoring with Fault Detection	see: RAIM
RAIS	Remote Airport Information Service
RPCON	Radar Approach Control
RAG	Runway arrest gear	Safety gear
RAI	Runway Alignment Indicator	Orbit orientation indicator
RAIL	Runway Alignment Indicator Lights	Orbit alignment indicator lights
RAIM	Receiver autonomous integrity monitoring	Automatic receiver for self-monitoring of GPS devices (the system built into the receiver checks the integrity of the GPS transmitters)
R.A.M.	Radar Absorbant Material	Radar absorbing materials - see: stealth technology
R.A.M.	Random Access Memory	Random access memory
RAMCC	Regional Air Movement Coordination Center
RAO	Regional Airworthiness Office
RAOB	Rawind probe observation	Weather observation using a combined radiosonde and radar wind observation
RAOC	Regional Air Operations Center
RAP	Reclearance Airport
RAPCON	Radar Approach Control Center, Radar Approach Control ( USAF )
RAR	Radar arrival route
RAR	Real aperture radar	see: Side-Looking-Airborne-Radar - SLAR
RAREP	Radar Weather Reports	Radar information about thunderstorms and precipitation
RASA	Radar Advisory Service Area
ADVICE	Ram Air Turbine	Dynamic pressure turbine ("rat")
ADVICE	Ram Air Temperature
RATCF	Radar Air Traffic Control Facility (US Navy)
RATO	Rocket Assisted Take Off	Missile-assisted aircraft launch
RATT	Radio Teletype
RB	Relative bearing	Radio lateral direction finding ; relative bearing (side bearing in relation to the aircraft longitudinal axis)
RBE	Remain-behind equipment
RBI	Relative Bearing Indicator	Relative Bearing Indicator (ADF) - a radio compass
RBN	Radio beacon	Radio beacon
RC	Rate of Climb	Rate of climb
RC	Road Reconnaissance
RC	Reconnaissance (Aircraft)	Reconnaissance aircraft (e.g. RC-135 )
RC	SOUTH Regional Command South (NATO)
R / C	Radio Controlled	radio controlled
RCA	Reach Cruising Altitude	Reaching cruising altitude
RCAF	Royal Canadian Air Force	Canadian Air Force
RCAG	Remote Communications Air / Ground Facility
RCC	Rescue Coordination Center	SAR control center; Rescue Coordination Center
RCD	Record	record
RCDR	recorder	Recorder
RCF	Radio communication failure	Radio failure message
RCL	Runway Center Line	Runway center line
RCL	Recall	remember, remember, repeat
RCL	Deeply Refrigerated Gas / Cryogenic Liquids (Cargo Code)	Liquid gas
RCL	Request for clearance
RCLL	Runway Center Line Lights	Runway center line lights
R-CLB	Reduced climb	reduced climb performance
RCLM	Runway Center Line Marking	Runway center line marking
RCLS	Runway Centerline Lighting System	Runway center line lights
RCM	Corrosive Material (Cargo Code)	Corrosive material - ( dangerous goods class )
RCMND	Recommended	recommended
RCO	Remote Communications Outlet	Radiotelephone relay station
RCP	Radio control panel, radio communication panel
RCPL	Restricted Commercial Pilot License	Limited commercial pilot license
RCR	Runway Condition Reading
RCS	Radar Cross Section	Radar cross-section - see: stealth technology
RCT	Ramp Control Tower
RCVR	Receiver	receiver
RCVS	Receives (Only)	only receives
RCX	Explosives (Cargo Code)	Explosive material - ( dangerous goods class )
RD	Rapid decompression	Sudden loss of pressure
R&D	Research and Development	Research and Development
RDD	Required delivery date
RDF	Radio Direction Finder
RDH	Reference Date Height (for ILS)	ILS reference height above the threshold; Flying height of the aerial of an aircraft above the threshold during a precision approach (ILS)
RDIS	Remaining Distance	Remaining flight route
RDL	Radial	Beacon
RDMI	Radio Distance Magnetic Indicators	Radio compass (RMI); Compass rose (rotates automatically), a thick and a thin pointer (switchable for VOR and NDB), 2 DME displays (DME-1, DME-2)
RDO	radio	Wireless
RDPS	Radar data processing system
RDR	radar	Radio detection and ranging
RDR	Radar Departure Route	Departure route by air traffic controller instruction
RDRMI	Radio Digital Distance Magnetic Indicator	Departure route by air traffic controller instruction
RDY	Ready	ready
RE	Right engine	right engine
RE	Recent	recently; previous; during the last few hours
RE	Reynolds Number	Formula symbol for Reynolds number
R E	Reynolds Number	Reynolds number
REC	Receive, receiver	Received, receiver
REC	Reclearance in flight	Release change during flight
REC	Recreation	recreation
RECD	Recorded	recorded
RECIRC	Recirculation, Recirculate	(Air) circulation; circulation
RECLPT	Reclearance Point	Clearance point
RED	Red	Red (weather key) - military - main cloud base and ground view below amber or below GCA minima; (see: color code )
REDL	Runway Edge Lights	Runway side marker lights
REF	Reference	Reference (reference value)
REF	Reference To; Refer To	Refer to, reference (reference value)
REF	Refuge	Refugium (Wildlife Reserve)
REFL	Refueling	refuel
REFRIG	Refrigeration	cooling
REFUL	Refueling	refuel
REFU	Remaining fuel	remaining fuel
REG	Registration	Aircraft registration
REG	Regulator	Regulator
REGL	Regular	regular, normal
REIL	Runway End Identifier Lights	Runway end lights
REJ	Reject message	Rejection message
REL	Release	let go, let go, relax
REL	Runway End Lights	End lights of the runway
RELCTD	Relocated	dislocated
SEM	Remaining	remaining
SEM	Remark	comment
REP	report	report
REP	Reporting point	Reporting point
REP	Repellent	Repellent, windscreen washer for the windshield (water repellent)
REPEL	Repellent	Repellent, windscreen washer for the windshield (water repellent)
REQ	Request	request
REQ	Required; Requirement	required; requirement
REQTOF	Required Take Off Fuel	Minimum fuel required
RERA	Recent Rain	New rain front
RES	reservation	Reservation; Seat booking
RES	reserve	reserve
RES	reservoir	Water reservoir
RESA	Runway End Safety Area	A defined level safety zone in front of and behind the runway
RESCAP	Rescue Combat Air Patrol
RESP	Respective	respective
REST	restaurant	restaurant
RESTR	Restricted; Restriction	limited; Restriction
RET	Rapid Exit Taxiway	Rapid roll-off
RETIL	Rapid Exit Taxiway Indicator Lights	Information lighting for rapid taxiways
REU	Remote Electronics Unit
REV	Revision	Rectification
REV	Reverse, reverser	backwards, backwards, turn around; Thrust reversal
RF	Registered Facility	Registered training institution
RF	Radio facility	Radio navigation device
RF	Radio frequency	Radio frequency (see frequency band )
RF	Radio failure	Radio failure
RF	Release fuel
RF	Reserve fuel	Reserve fuel (must last for 30 minutes)
RF	Refill	refill; to refill
RFC	Radio facility chart	Radio navigation card
RFDS	Royal Flying Doctor Service of Australia
RFF7	Rescue Fire Fighting ICAO Category 7
RFG	Flammable Gas (Cargo Code)	Flammable gas
RFL	Flammable Liquid (Cargo Code)	Flammable liquid - ( dangerous goods class )
RFL	Refill	refill; to refill
RFL	Reflected	reflected
RFL	Required field length	required runway length ( runway )
RFL	Requested flight level
RFLCTRS	Reflectors	Reflectors
RFLG	Refueling	refuel
RFO	Routine flight operations
RFP	Replacement Flight Plan	Replacement schedule
RFS	Flammable Solids (Cargo Code)	Combustible solid - ( dangerous goods class )
RFS	Route Feeder Service (Cargo Code)	Replacement air freight ; Road replacement transport - truck transport of air freight
RFSC	Rubberized Friction Seal Coat
RFTS	Request for technical support	Ask for technical support
RFW	(Restricted, Flammable, Water) (Cargo Code)	Substances that form flammable gases in contact with water - ( dangerous goods class )
RG	Range	Range
RG		Rescue device
RGDS	Regards	greetings
RGS	Remote Ground Station, VHF Ground Station	Transceivers located on the ground for communication with aircraft
RGT	Right	Right
RGX	Explosives (Cargo Code)	Explosive material ( dangerous goods class )
RH	Right hand	right (e.g. RH Engine - right engine)
RH	Right Hand (Pattern)	Fly clockwise ( traffic pattern )
RHF	Harmful (Cargo Code)	Harmful substances - ( dangerous goods class )
R / I	Remove / Install	can be attached and removed
RIAS	Runway Incursion Alerting System
RIF	Reclearance in flight	Change of clearance during the flight
RII	Required inspection time
RIO	Radar Intercept Officer	Weapons system officer
RIS	Infectious substances (Risk) (Cargo Code)	Infectious substances ( dangerous goods class )
RITTR	Area Navigation Instrument Flight Rules Terminal Transition Route
RJ	Regional jet	Ragionaljet; (uncommon: regional jet aircraft) - is increasingly displacing turboprops; see: regional airliner
RKN	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - refrigerated LD3
RL	Runway lighting	Runway - lights
RL	Rhumb Line	Same course, Loxodrome
RLCE	Request Level Change En Route	Inquire about change of flight area during cruise
RLD	Rijksluchtvaartdienst	Dutch Aviation Authority
RLG	Ring laser gyroscope	Laser gyro (for the inertial navigation system - INS)
RLLNG	Rolling	rolling (e.g. rolling start - without stopping again on the runway)
RLLS	Runway Lead-in Lightning System
RLS	Remote light sensor	Far light sensor ( Boeing 747 )
RLY	Relay	relay
RM	Remark	Note (USA - in PIREPs )
RMI	Radio Magnetic Indicator	Radio compass indicator; Combined display device for radio navigation systems (VOR, NDB) and radio compass.
RMD	Miscellaneous Dangerous Goods (Risk Miscellaneous Dangerous) (Cargo Code)	various dangerous goods ( dangerous goods class )
RMK	Remark	comment
RMLG	Right Main Landing Gear	right main landing gear - landing gear (aircraft)
RMP	Radio management panel
RMS	Root Mean Square	Square mean
RMT	Remaining time
RMVL	Removal
RMZ	Radio Mandatory Zone	Airspace with obligation to listen around airfields with IFR approach and departure procedures for which no airspace D (CTR) is available (formerly airspace F)
RN	Radar navigation
RN	Right nose	front right
RNAV	Area navigation, random area navigation	Area navigation
RNG	Non-Flammable and Non-Toxic Gas (Cargo Code)	Non-flammable, non-toxic gas ( dangerous goods class )
RNG	Range; Radio range	Range
RNG ARC	Range Arc
RNP	Required navigation performance
RNP I	Required air navigation performance	Minimum navigation equipment; Aircraft in this airspace, route section or procedure must be able to navigate precisely (to 0.5 NM, e.g. RNP 10)
RNPC I	Required Air Navigation Performance Capability	see: RNP
RNV	Area navigation	RNAV area navigation; Area navigation
RNZAF	Royal New Zealand Air Force	New Zealand Air Force
RO	Roll out	( Boeing 747 )
ROC	Rate of Climb	Climb rate (measured in FPM)
ROC	Required obstacle clearance	required clearance height
ROCC	Region Operations Control Center
ROD	Rate Of Descent	Sink rate (measured in FPM)
ROFOR	Route forecast	Route weather forecast
ROME	Read only memory	Read-only memory
RON	Receiving Only	only receives
RON	Remain overnight	The crew is staying somewhere other than home base; usually also the aircraft - it must be appropriately secured (covers, lashing)
ROP	Organic peroxide (cargo code)	Peroxide ( dangerous goods class )
ROPS	Runway Overrun Prevention System
ROS	Route Oriented Scheme
PINK	Radar Open System Architecture
RED	Runway Occupancy Time
RED	rotation	revolution
RED	Rate one turn	Standard curve - 3 ° / second = = 180 ° / 1 minute = 360 ° / 2 minutes = 2-minute circle
ROV		Spatial planning procedure
ROX	Oxidizing Substances (Cargo Code)	oxidizing substances ( dangerous goods class )
RP	Reporting point	Reporting point
RP	Rotation point	Rotation point
RPB	Toxic Substances (Cargo Code)	Toxic substances ( dangerous goods class )
RPG	Toxic Gas (Cargo Code)	Toxic gas
RPI	Runway Point of Intercept
RPIG	Reporting	to report
RPL	Repetitive Flight Plan	Duration schedule
RPLC	Replace	replace
RPI	Runway Point of Interception
RPK	Revenue Passenger Kilometers	Passenger or seat kilometers
RPM	Revolutions per minute	Revolutions per minute (propeller speed, turbine speed)
RPT	Repeat	to repeat; I repeat
RPT	report	report it)
RPT	Regular Public Transport
RPTG	Reporting	to report
RPTING	Repeating	to repeat
RPU	Receiver Processor Unit	Receiver processing unit (see Omega navigation procedure )
RPV	Remotely Piloted Vehicle	remote-controlled aircraft
RPZ	Runway Protection Zone
RQR	Required	required
RQRD	Required	required
RQRS	Requires	requires
RQS	Request Supplementary Flight Plan Message	Request for a flight plan supplement message
RR	Railroad	Railroad track
RR	Low or Medium Frequency Radio Range Station
RR	Right rear	back right
RR	Rolls Royce	International group, engine manufacturer
RR	Ram Rise	in the back right the difference between Total Air Temperature and Static Air Temperature
R / R	Re-registered
R&R	Rest and recovery	rest and relaxation
RRD	Rolls-Royce Germany
RRJ	Russian regional jet	Sukhoi Superjet 100
RRL	Runway Remaining Lights
RRRCAT	Radioactive Category (Cargo Code)	Radioactive hazard class ( dangerous goods class )
RRT	Rerouting	Detour routing
RRW	Radioactive Material (Cargo Code)	Radioactive material ( dangerous goods class )
RRWDS	Radar Remote Weather Display System	Real-time weather radar system in the USA - with Doppler system
RRY	Radioactive Material (Cargo Code)	Radioactive material ( dangerous goods class )
RRZ	Radar Regulation Zone
RSB	Polymeric Beads or Granules (Cargo Code)	Polymer beads or granules ( dangerous goods class )
RSBN	Radiotechnizscheskaja systema blischneij nawigaci (russ.), TACAN-like navigation system	A Russian civil and military radio navigation system that is similar to the VOR rotary radio beacon
RSC	Rescue Sub-Center	SAR -Unterleitstelle
RSC	Runway Surface Conditions	Runway surface texture
RSC	Substances Liable to Spontaneous Combustion (Cargo Code)	Substances that tend to spontaneously ignite
RSDU	Radar Storm Detection Unit
RSEP	Rudder System Enhancement Program
RSP	Respond Beacon	Responder
RSR	Reinstated canceled flight	Flight that had already been canceled was put back into force
RSR	En-Route Surveillance Radar	Course overview radar
RST	Reset	Restart; reset to a defined start state
RSS	Relaxed static stability	An aircraft with reduced stability has a tendency to break out and must therefore be controlled by computers and fly-by-wire (e.g. Lockheed F-117 ), whereas e.g. B. a Cessna 150 stable
RST	restaurant	restaurant
RSTD	Restricted	limited
RSTRCTD	Restricted	limited
RSTRCTNS	Restrictions	restrictions
RSV	reserve	Reserve (e.g. RTE RSV - Route Reserve - reserve fuel for the flight route; reserve fuel)
RSVM	Reduced Vertical Separation Minima	Reduced vertical staggering (more letters rotate - instead of RVSM, as it should be called correctly)
RSVR	reservoir
RT	Right turn	right turn
RT	Right	right
RT	Remote terminal
RT	Rate of turn	Rotation speed (usually given as degrees per minute ) - is measured with the turn indicator
R / T	Radio telephony	Aeronautical radio ; Radiotelephony
R / T	Receiver / transmitter	Receiver / sender
RTA	Required time of arrival
RTC	Real time clock
RTCA	Radio Technical Commission for Aeronautics	(USA - Washington, DC)
RTD	Retarded	delayed (reported weather report - Terminal Aerodrome Forecast - TAF)
RTE	route	route
RTE DATA	Route data	Route data
RTF	Radio telephony; Radio telephone	Radiotelephone , two-way radio
RTH	Rescue helicopter
RTN	return
RTO	Rejected take-off	Start aborted (literally: rejected start) - e.g. B. a preset on the brakes
R-TO	Reduced take-off	reduced starting power
RTOP	Reduced take-off power
RTOP	Radiotelephone Operator Permit	Radiotelephony certificate (e.g. FCC RTOP - American radiotelephone certificate)
RTOW	Regulatory Take Off Weight
RTP	Radio tuning panel
RTR	Remote transmitter / receiver	Remote controlled radio
RTR	rotor	z. B. Rotor Overspeed (helicopter)
R / TRU	Regulated Transformer Rectifier Unit	Regulated transformer - rectifier unit; see: TRU
RTS	Returned to Service, Return to Service	Back in operation
RTT	Radio Teletype	Radio teletype
RTT	Rate Two Turn	Double fast standard curve (aviation) - 6 ° / second = = 180 ° / 30 seconds = 360 ° / 1 minute
RTTY	Radio Teletype	Radio telex
RTU	Radio tuning unit	Radio frequency dialer
Ambulance	Round-the-world	Round-the-world ticket
RUD	Rudder	Rudder
CALL	Rough	rough
RUNB	starts the elapsed time (ET) display	(Clock in the cockpit) starts the display of the elapsed time (ET)
RUT	Standard Regional Route Transmitting Frequency	Regional route frequencies
RV	Rescue Vessel	Lifeboat
RV	Radar Vector
RVDT	Rotary Variable Displacement Transducer, Rotary Variable Differential Transducer	( Boeing 747 )
RVML	Raw Vegetarian Meal (Catering Code)	vegetarian raw food - see: airplane food
RVR	Runway Visual Range	Runway visibility; the officially established visibility on the runway; z. B. RVR 24 means: a view of 2,400 m
RVR	River	flow
RVSM	Reduced Vertical Separation Minima	Reduced vertical staggering (1000 ft) above FL 290 (previously 2000 ft)
RVSR	Reverser	Thrust reversal
RVV	Runway Visibility Value
RW	Right wing	right wing
R / W, RW	runway	Runway ; piste
RWA	Relative Wind Angle	The angle between the wind direction and the true heading or the aircraft longitudinal axis
RWC	Runway Weight Charts
rwK	True course (TC)	Right course
rwN	True North (TN)	True North - points to the geographic North Pole
rwSK	True Heading (TH)	Legal heading
RWY	runway	Start-and runway
RX	Receive; Receiver
RXB	Explosives (Cargo Code)	Explosive material
RXC	Explosives (Cargo Code)	Explosive material
RXD	Explosives (Cargo Code)	Explosive material
RXE	Explosives (Cargo Code)	Explosive material
RXG	Explosives (Cargo Code)	Explosive material
RXS	Explosives (Cargo Code)	Explosives - may be transported in passenger planes
RZ	Reference Zero	Reference area zero
RZ	Return to Zero	( Boeing 747 )

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