Abbreviations / Aviation / S – Z

This is the fifth 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 ; M ; N ; O ; P ; Q ; R.
Part 5	S-Z	S - ( SA , SB , SC , SD , SE , SF , SG , SH , SI , SJ , SK , SL , SM , SN , SO , SP , SQ , SR , SS , ST , SU , SV , SW , SY ); T - ( TA , TB , TC , TD , TE , TF , TG , TH , TI , TJ , TK , TL , TM , TN , TO , TP , TQ , TR , TS , TT , TU , TV , TW , TX , TY , TZ ); U - ( UA , UC , UD , UF , UH , UI , UK , UL , UN , UP , UR , OS , OT , UU , UW ); V - ( VA , VB , VC , VD , VE , VF , VG , VH , VI , VL , VM , VN , VO , VP , VR , VS , VT , VV , VW , VX , VY , VZ ); W - ( WA , WB , WC , WD , WE , WF , WG , WH , WI , WK , WL , WM , WN , WO , WP , WR , WS , WT , WV , WW , WX , WY ); X - ( XB , XC , XD , XF , XH , XI , XM , XN , XO , XP , XQ , XR , XS , XT , XW , XX ); Y - ( YC , YD , YL , YR , YS , YU , YY); Z - ( ZA , ZB , ZE , ZF , ZI , ZK , ZL , ZM , ZN , ZO , ZP , ZT , ZU , ZV , ZZ )
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

S.

(to the next letter - T) ... (to the top of the list)

SA , SB , SC , SD , SE , SF , SG , SH , SI , SJ , SK , SL , SM , SN , SO , SP , SQ , SR , SS , ST , SU , SV , SW , SY

S.	Sierra	int. spelling alphabet ( ICAO alphabet )
S.	South; Southern Latitude	South; southern; southern latitude
S.	Straight-in	Direct approach (for landing )
S.	Sensitivity level
(S)	Summer time	Summertime
SA	Selective Availability	Artificially activated blurring of the civilian GPS satellite signal (until May 1, 2000), which is intended to prevent civilian devices from being used to control weapons.
SA	Situational awareness	Situation awareness - the precise perception of the factors and conditions by the pilot (pilot) that instantly influence the safe operation of the aircraft and the flight crew
SA	Surface Observations (Weather)	Surface observation ( weather ) - 6 hour weather forecast for the airport
SA	Actual Weather	Current weather ( METAR ) - is updated every 30 minutes, forecast period 2 hours.
SA	sand	Sandstorm (weather key for METAR and TAF )
SA	Safety area
SAA	Special activity airspace; Special Activity Area	z. B. Restricted, Danger Areas, Military Operations Areas
SAAAR	Special Aircraft and Aircrew Authorization Required
SAARU	Standby Attitude Airdata Reference Unit, Secondary Attitude Airdata Reference Unit	( Boeing )
SAASCo	South African Aviation Safety Council
SAD	Specific Air Distance	specific distance from air
SADIS	Satellite Distribution System
SAFA	Safety Assessment of Foreign Aircraft
SAFE	Safety and Flight Equipment Manufacturers Association
SAFO	Safety alert for operators
SAI	Standby attitude indicator	Reserve Artificial Horizon
SAI ILS	Standby Attitude Indicator - Instrument Landing System	Reserve artificial horizon with display for the instrument landing system
SAL	Slot allocation list
SALRS	Saturated Adiabatic Lapse Rate	see: Atmospheric temperature gradient
SALS	Short Approach Lighting System	special runway lights
SALSF	Short Approach Lighting System with Sequenced Flashing Lights	special runway lights
SAM	South america	South America (ICAO region)
SAM	Slot allocation message
SAM	Special Air Mission
SAME	Senior Aviation Medical Examiner	Aviation Medicine Doctor ( Aviation Doctor )
SASPO	As soon as possible	as soon as possible
SAP	As soon as possible	as soon as possible
SAR	Search and Rescue	Search and rescue services for aircraft
SAR	Specific Air Range	the distance traveled per unit of fuel; specific range in relation to the air
SAR	Synthetic aperture radar	imaging radar - provides a 2-dimensional representation of a section of the terrain
SARPs	Standards and Recommended Practices	Guidelines and recommendations of (the ICAO )
SARSAT	Search and Rescue Satellite Aided Tracking System	COSPAS-SARSAT (see also: COSPAS-SARSAT)
SARTIME	Search and Rescue Time	(Australia) for flight plans for flights outside of controlled areas, the pilot specifies a SAR time; the point in time from which a search and rescue operation is to be initiated for him if he does not arrive at the destination airport
SAT	Saturday	Saturday
SAT	Static Air Temperature	Outside air temperature (static) ( air temperature ); static air temperature
SAT	South Atlantic	South Atlantic (ICAO region)
SATCO	Senior Air Traffic Control Officer	Highest superior of the air traffic control personnel in the NATO-assigned Air Force Association
SATCOM	Satellite communication
SATCOM	Satellite Communication System	( Boeing 737 -700 / -800 / -900, Boeing 747 , Boeing 757 , Boeing 767 )
SATMA	South Atlantic Monitoring Agency	( ICAO )
SATS	Small Aircraft Transportation System	(see: Very Light Jet )
SATS	Short Airfield for Tactical Support	Take-off and landing on land using the techniques of an aircraft carrier to shorten the take-off and landing distance. This made mobile airfields possible. Starts on a 220 m long route were possible thanks to the catapult launch. The launch catapult accelerated the F-104 to a take-off speed of 360 km / h in 8 s.
SAVASIS	Simplified Abbreviated Visual Approach Slope Indicator	special approach lights
SAWRS	Supplementary Aviation Weather Reporting Station	special approach lights
SB	South Bound	flying south
SB	Service bulletins	Maintenance notifications (e.g. self-service listing - list of maintenance notifications)
SB	Start boarding	with the boarding begin
SB	(Russian) Скоростной бомбардировщик, Skorostnoi Bombardirowschtschik, high speed bomber	fast bomber (e.g. Tupolev SB-2 )
SBAS	Satellite Based Augmentation System	satellite-based improvement of navigation systems
SBEW	Standard Basic Empty Weight
SBT	Scenario Based Training
SBT	Simulator Based Training
SBY	Standby	Standby, reserve
S / C	Step Climb	Intermediate climb (the flight begins at the initial cruising altitude INIT FL)
SC	Stratocumulus	Stratocumulus clouds
SC	Small circle	Small circle
SCA	Southern Control Area
SCAP	Standard Computerized Aircraft Performance
SCATANA	Security Control of Air Traffic and Navigation Aids
SCD	Side Cargo Door (Cargo Code)	side cargo door
SCH	Schedule change	Flight schedule time changed
SCHED	Scheduled Services
SCID	Signal Collection / Tail ID Card	( Boeing )
SCID	Software Identification Number
ScOACC	Scottish and Oceanic Area Control Center
SCOB	Scattered Clouds or Better Approaches
SCP	Stretcher	Ambulance stretcher (passenger information)
SCR	Sterile cockpit rule	Sterile cockpit rule
SCT	Scattered	Scattered clouds (1/8 - 4/8), also (3/8 - 4/8), if the abbreviation FEW is used for (1/8 - 2/8) ; Cloud cover not closed (degree of coverage)
SCTD	Scattered	Scattered clouds (3/8 - 4/8)
SCU	Starter Converter Unit	z. B. APU SCU (Boeing 737)
SD	Special designator
SD	Spacial disorientation	spatial disorientation
SD	Radar Weather Report
S / D	Stepdescent	Intermediate descent
S / D	Shut down	Shut down the engines
S / D	Seadrome	Sea airfield
S&D	Schedulers & Dispatchers	see: flight dispatcher
SDAC	System Data Acquisition Monitor	see: ECAM
SDBY	Standby	Standby, reserve
SDD	Synthetic Dynamic Display
SDF	Simplified Directional Facility (USA)
SDI	Source / Destination Identifier	( Boeing 747 )
SDL	Software data loader	( Boeing 747 )
SDRL	Supplier data requirements list	( Boeing 747 )
SDU	Satellite Communication System Data Unit	( Boeing )
SDU	Satellite Data Unit	( Boeing )
SE	Southeast	Southeast ( cardinal direction )
SE; S / E	Single engine	single engine
SEAD	Suppression of Enemy Air Defenses	Anti-aircraft defense
SEB	Southeast Bound	flying to the southeast
SEC	Seconds	Seconds
SEC	Spoiler / elevator computer	Elevator and spoiler calculator
SEC	Sector	section
SECT	Sector, Section	section
SFAR	Special Federal Aviation Regulation, Special FAR	(issued by the Federal Aviation Administration - FAA)
SEIFR	Single engine IFR	U.S. regulations for commercial instrument flight in single-engine aircraft
SEL	Select; Selector	Choose, voter, choose (e.g. HDG SEL - a mode on the autopilot )
SEL	Sound exposure level	Noise pollution at airports
SEL	Selected	selected - Selected Air Temperature (MAX SEL - Derating - Reduction of the engine power for take-off)
SEL TEMP	Selected Temperature	selected - Selected Air Temperature ( Derating - reduction of engine power for take-off) - also: Assumed Temperatur - ASS TEMP
SELCAL	Selective calling system	Selective call system
SEN	sensor	Probe
SENS	Sensitivity	sensitivity
SEP	September	September
SEP	Specific excessive power
SEP	Single engine piston	a category in light aircraft
SER	Stop End of Runway
SER	service	service
SERV	service	Service, maintenance
SES	Single European Sky
SESAR	Single European Sky ATM Research	Aviation and management system (managed by Eurocontrol; designed by the European Commission)
SEU	Seat Electronic Unit
SEV	Severe	severe (e.g. gusts or icing)
SF	Shear Force	Shear force
SFA	Single frequency approach	for single-seat military jets - approach and landing only on one frequency (recorded in DOD FLIP IFR)
SFAR	Special Federal Aviation Regulation	(the FAA)
SFC	Surface	Ground; Floor level; Height above ground; Surface; surface
SFC	Specific Fuel Consumption	specific fuel consumption (per hour); relates to the power - in contrast to Thrust Specific Fuel Consumption (TSFC) - the thrust-specific fuel consumption; Fuel flow per horsepower (FF / HP) - unit: e.g. B. lbs of fuel / hour / hp
SFDR	Standard flight data recorder	Version of the Flight Data Recorder - FDR - flight data recorder
SFE	Synthetic Flight Examiner
SFE	Seller Furnished Equipment	( Boeing )
SFENA	Société Française d'Equipements pour la Navigation Aérienne	a manufacturer of aircraft equipment
SFI	Synthetic Flight Instructor
SFI / SFE	Synthetic Flight Instructor / Examiner
SFL	Sequenced Flashing Lights	Chase lighting
SFML	Sea Food Meal (Catering Code)	Seafood meal (fish) - see: airplane meal
SFMOH	Since Factory Motor Overhaul	Operating time since the engine was overhauled
SFO	Simulated flameout	Exercise on military jets, landing with idle thrust
SFO	Senior First Officer	First officer ; Rank badge of the cockpit crew ( pilots ) at Deutsche Lufthansa
SFO	Since Factory Overhaul
SFREM	Since Factory Remanufactured Engine
SFRM	Since Factory Remanufactured Engine
SFROH	Since frame overhaul	Operating time since cell overhaul
SFT / WET	Soft when wet	soft surface when wet
SG	Snow grains	Snow grains (weather key for METAR and TAF )
SG	Icon generator	( Boeing 747 )
SGC	Slaved Gyro Compass
SGHA	Standard Ground Handling Agreement
SGL	signal
SGML	Standard Generalized Markup Language	This is the format in which the raw data, the Master Minimum Equipment List - MMEL - and the Aircraft Maintenance Manual - AMM - from Airbus and Boeing are available
SH	Showers	Showers (weather key for METAR and TAF )
SH	Simulator Hours	Simulator lessons
SHF	Super high frequency	Centimeter wave
SHF	Single heading flight
SHLDR	Shoulder	Edge fastening (of the taxiway, runway)
SHOTS	Since hot section inspection	Operating time since hot part inspection (of the turbine)
SHP	Shaft horse power	Shaft horsepower (power to the propeller shaft) - see: horsepower (virtually identical to Brake Horsepower - BHP; emphasizes the method of determining force BHP, SHP emphasizes the magnitude of the force on the shaft)
SHV		Swiss Hang Glider Association
SI	Straight-in approach	Direct approach
SI	Supplementary information	additional explanation
SI	Special Instructions
SIA	Standard Instrument Approach	Standard instrument approach
SIA	Service de l'information aéronautique	Flight information service (France)
SIAP	Standard Instrument Approach Procedure	Standard instrument approach procedures
SIBT	Scheduled in-block time
SIC	Second in Command	( Pilot ) second in command; if two captains are on board, one is Pilot on Command (PIC) and the other is Second in command (SIC)
SID	Standard Instrument Departure , Standard Instrument Departure Route	Standard instrument departure procedures from an airport
SIDA	Security Identification Display Area
SIF	Selective Identification Feature	selective identification system for recognition by friend-foe recognition system (IFF)
SIFF	Successor IFF
SIG	Significant	significant; significant
SIGMET	Significant Meteorological Information	essential meteorological weather data - information regarding weather phenomena on the flight route that can impair the safety of flight operations
SIGWX (SigWX)	Significant Weather Chart	significant weather phenomena
SIL	Service Information Letter	Maintenance circular
SIL	Safety Integrity Level
SIMMOD	The Airspace and Airport Simulation Model
SIMUL	Simultaneously	at the same time
SIP	Slot Improvement Proposal Message
SIS	Service Interphone System
SIS	Safety Instrumented System	( Flight safety )
SIT	Slot issue time
SITA	Societé Internationale de Télécommunications Aéronautiques	Airline telex system; leading service provider in the information and telecommunications sector of the aviation industry and operates z. B. a global data network through which companies like Lufthansa can regulate their data exchange.
SITA TMI	Société Internationale de Télécommunications Aéronautiques Track Message Ident number
SIWL	Single Isolated Wheel Load	Comparable single wheel load
SJ	Small jet
SKC	Sky Clear	Sky clear
SKD	Schedule; Scheduled	As planned
SKED	Schedule; Scheduled	As planned
SKP	Start control point	in uncontrolled places mostly vehicle in which the flight director sits (hardly used today)
SKYDVNG	Skydiving	Skydiving
SL	Sea level	Sea level
S / L	runway	Start-and runway
SLAP	Slot allocation procedure	Time slot allocation procedure
SLAR	Side-Looking Airborne Radar	Radar - sideways to the direction of flight
Slat	(actually not an abbreviation)	Slat flap
SLB	runway	Start-and runway
SLB	Slender body
SLC	Slot cancellation message
SLC	Safety Life Cycle
SLCTD	Selected
SLCTR	Selector
SLDI	Sector List Drop Interval
SLF		Seat load factor
SLFPM	Sea level feet per minute	Rate of pressure change in sea level feet per minute (1 SLFPM is around -0.036621555 mbar / min)
SLIR	Sideways Looking Infrared (Sensor)	Infrared sensor looking to the side (see also: FLIR - Forward Looking Infrared (Sensor) - infrared sensor looking in the direction of flight; DLIR - Downward Looking Infrared - infrared sensor looking downwards)
SLOP	Strategical Lateral Offset Procedure	Method which allows the pilot to fly a parallel offset of 1NM or 2NM when navigating along an assigned route, e.g. B. in MNPS airspace
slot	Slot (aviation)	Defined time window during which an airline may use the runway of an airport
SLP	Speed ​​limit point	Speed ​​limit point - from this point (e.g. Jeppesen approach charts), speed limits apply during the approach
SLP	Mean Sea Level Pressure	the last 3 digits of the pressure at sea level (USA - e.g. SLP 134 = 1013.4 hPa)
SLP		Special landing site (for special purposes, e.g. UL-SLP)
SLP	Slopes	Tilt
SLPS	Slopes	Tilt
SLR	Specific Long Range (Operations)
S-LSA	Special Light-Sport Aircraft	light special sport aircraft - a category of light aircraft
SLST	Sea level static thrust
SLV	Statens Luftfartsvaesen (DK); Statens Luftfartsvæsen; Danish Civil Aviation Authority	Aviation Authority Denmark
SLW	Slow	slowly
SLW		Vertical stabilizer
SM	Statute mile	Country mile (1 SM = 1.609 km)
SM	smale	small
SM	Static margin
SMAC	Standard Maneuvers and Configurations
SMB	Side marker board
SMC	Surface Movement Control	Ground movement control
SMGCS	Surface Movement Guidance Control System	(pronounced: smigs)
SMM	Safety Management Manual	summer
SMM	Slot missed message	summer
SMMRS	Summers	summer
SMOH	Since Motor Overhaul; Since Major Overhaul	Since engine / general overhaul
SMR	Surface Movement Radar	Ground motion radar; see ground radar (air traffic control)
SMS	Safety Management System
SMS	Stores management system	(F-18 Fighter Cockpit: Gun Control)
SMYD	Stall Management Yaw Damper (Computer)
SN	Snow	Snow (weather key for METAR and TAF )
SN	System Strategic Navigation
S / N	signal to noise ratio
S / N	Serial Number	serial number
SNBNK	Snowbank	Snowdrift (by wind or snow plow)
Snecma	Société Nationale d'Etudes et de Constructions de Moteurs d'Aviation	French engine manufacturer
SNGL	single	individually
S / No	Serial Number	serial number
SNS	since	since
SNR	sensor	sensor
SNSR	sensor	sensor
SNSTV	Sensitive	sensitive
SNOWTAM	Snow Notam	Information about dangerous conditions caused by snow , ice , slush or standing water on the movement area
SO	Second officer	2nd officer; Rank badge of the cockpit crew ( pilots ) at Deutsche Lufthansa - in the first three months after acquiring the ATPL - is monitored by a first officer
SO	Standards Office (EUROCONTROL)
SO	Supercharged / (Horizontally) Opposed	Boxer engine with a supercharger (compressor) driven by the engine (part of the type designation for aircraft engines )
SOBT	Scheduled off block time	planned “off-block” time
SOC	Start of Climb (at Missed Approach)	Beginning of the climb (at the missed approach point)
SOC	Sector Operations Center
SOCC	Sector Operations Control Center
SODA	Statement of Demonstrated Ability
SODALS	Simplified Omnidirectional Approach Lightning System
SOE	Supervised Operating Experience	accumulated operating experience under supervision and guidance
SOHC	Single overhead camshaft	single overhead camshaft - for overhead valve
SOIA	Simultaneous Offset Instrument Approach (USA)	simultaneous ILS PRM and LDA PRM approaches
SOIR	Simultaneous Operations on Intersecting Runways; Simultaneous Operations on Parallel (or Nearby) Runways	Simultaneous operation on intersecting runways - may require "Land and hold short operations" (LAHSO)
SOL	Solenoid	Solenoid , solenoid
SOP	Standard Operating Procedure; Standing Operating Procedures	Standard operating procedures
SOP	Standard option pin
SOPA	Standard Operating Procedures Amplified
SOPRV	Shut-Off and Pressure Regulator Valve	(on the engine)
SOR	State of Readiness
SOS	International Distress Signal	international emergency call sign (see: Morse code # SOS ; emergency call )
SOS	Special Operations Squadron (USAF)
SOTA	Shannon Oceanic Transition Area	Transitional area to the North Atlantic Track System (NAT)
SOTEIRA	not an abbreviation, but the name of a goddess	System for the rescue of pilots with the help of a solid fuel missile
SOTMV	Shut-Off and Temperature Modulating Valve	(on the engine)
SO V	Shut Off Valve	Shut-off valve
SovAF	Soviet Air Force	Soviet Air Force (now: Russian Air Force )
SP	Single pilot	One-man crew
SP	speed	speed
SP	Special performance	z. B. Raytheon Hawker 800 SP
SP	Space	Space (a button on the Control and Display Unit )
SPA	Single pilot airplane	Airplane for one-man crew
SPA	Slot Improvement Proposal Acceptance Message
SPD	Special forecast	selected special weather report for aviation
SPD	speed	speed
SPDBRK	Speedbrake	Air brake
SPD PRF	Speed ​​profiles	Speed ​​profile (on the autopilot : descending or climbing flight at constant speed)
SPD INTV	Speed ​​intervention
SPEC	Special	special
SPECI	Special Forecast, Special Weather Report, Aviation Selected Special Weather Report	selected special weather report for aviation
SPF	Scratch Pad Field	Writing field (on the Central Display Unit - CDU)
SPH	Single pilot helicopter	One-man helicopter
SPL	speed	speed
SPL	Sport Pilot License	Sport pilot license for ultralight / parachutes
SPL	Supplementary Flight Plan Message	Flight plan supplement message
SPL	System flight plan
SPM	Surface Posion Monitor
SPML	Special Meal (Catering Code)	Ordered special meal for passengers (e.g. kosher ) - see: airplane meal
SPO	Short Period Oscillation	Mode of possible torsional vibrations around an aircraft axis
SPOC	Search and Rescue Point of Contact	Search and rescue service contact point
SPOH	Since Prop Overhaul
SPR	Speaker	speaker
PLC	Standard Positioning Service (GPS)	Part of the Global Positioning System (GPS) - accuracy: 100 m horizontally, 156 m vertically - less accurate than the Precise Positioning Service (PPS); is improved by WAAS
PLC	Standard pressure setting	Standard setting on the altimeter - 1013 hPa - see: Air pressure measurement in aviation
PLC	Samples per second	( Boeing 747 )
SPWR	Specially Prepared Winter Runway
SQ	Squall	Gusts (weather key for METAR and TAF )
SQ	Squelch	Squelch / Sensitivity ( radio )
SQ	Squawk	Transponder code ; Transponder setting; Transponder must be set to the following code ... (e.g. Squawk 7400)
SQ	Square	square
SQ	Squadron	squadron
SQL	Squall Line	Gust line
SQL	Squelch	Squelch , noise reduction
Squawk	Activate transponder code	Transponder code
SR	Sunrise	Sunrise - z. B. SS + 30 TILL SR-30
SR	Service request	Maintenance requirement
SR	Special regulations
SR	Specific range	specific range in relation to the ground
SRA	Surveillance Radar Approach	Panoramic radar approach
SRA	Special Rules Area
SRA	Solar Radiation Alert
SRE	Surveillance Radar Element Of GCA ; Surveillance Radar Element Of PAR System	Panoramic radar part for GCA; Panoramic radar part for PAR system
SRF	Scientific Research Facility	Scientific research facility in the Center for Flight Simulation Berlin GmbH - in the Institute for Aerospace at the Technical University of Berlin
SRG	Short range	Small range
SRG	Safety Regulation Group	(the Civil Aviation Authority - CAA / SRG)
SRIA	Strategic Research and Innovation Agenda
SRJ	Slot Improvement Proposal Rejection Message
SRM	Structural Repair Manual	Repair instructions for the aircraft structure
SRM	Stab Trim Rudder, Stabilizer Trim / Rudder Ratio Module	Stabilization of the trim tab (done by the ratio module computer on the B-747 )
SRM	Single pilot resource management	(see: Crew Resource Management )
SRM	Slot revision message
SROB	Short range omnidirectional beacon
SRR	Search And Rescue Region	Search and rescue region ( Search and Rescue )
SRRNDS	Surrounds	surrounds
SRS	Speed ​​Reference System
SRS	Standard routing scheme	other designation for RAD, TOS
SR-SS	Sunrise to Sunset	Sunrise to sunset
SRU	Shop replaceable unit	Exchange unit (for changing in the workshop - in contrast to the Line Replaceable Unit - LRU)
SRY	Secondary	secondary; Second-…
SRZ	Special radar zone
SRZ	Surveillance Radar Zone	All-round visibility radar zone
SS	Sandstorm	Sandstorm (weather key for METAR and TAF )
SS	Sliding scale
SS	Single shot
SS	Sector supervisor
SS	Sunset	sunset
SS	Single seat	Single seater
SS	Slow Slew	slow rate of change (e.g. SS on the clock around the cockpit - when setting the current date)
SS + 30	30 minutes after sunset	30 minutes after sunset
SSA	Sector Safe Altitude	the MSA of the control sector used including glide path in the terminal area
SSAL	Simplified Short Approach Lightning System	special runway lights
SSALF	Simplified Short Approach Lightning System with sequenced flashing light	special runway lights
SSALR	Simplified Short Approach Lightning System with RAIL	special runway lights
SSALS	Simplified Short Approach Lightning System, Simplified SALS	special runway lights
SSALSF	SSALS with SFL, Simplified Short Approach Lightning System with sequenced flashing light	special runway lights
SSALSR	SSALS with RAIL, Simplified Short Approach Light System with Runway Alignment Indicator Lights	special runway lights
SSB	Single side band	Single sideband modulation
SSB	Split system breaker	separates the left (bus 1 and 2) and right (bus 3 and 4) electrical system from each other - Boeing 747
SSCVR	Solid-State Cockpit Voice Recorder	(1992 - 30 min; 1995 - 2 h; no moving parts, just memory chips)
SSDFR	Solid State Digital Flight Recorder, Solid State DFR	Flight recorder without moving parts, only with memory chips
SSE	South-southeast	South-southeast ( cardinal direction )
SSE	Simple Single Engine (UK)	(up to 2 t) the British NPPL license (National Private Pilot's License) entitles you to fly these aircraft
SSFDR	Solid-state flight data recorder	(Fairchild SSFDR model F1000 - 1990; no moving parts, just memory chips)
SSIM	Standard Schedules Information Manual	defines communication formats with which flight plan information is exchanged; appears twice a year
SSJ	Sukhoi Superjet 100	originally referred to as the Russian Regional Jet (RRJ)
SSL	Standard sea level	Standard conditions of the atmosphere at sea level
SSM	Standard Schedules Message	Telex format to exchange period-based changes to flight plans; is defined in the SSIM;
SSM	Standard Specifications Manual
SSM	System surveillance and maintenance
SSM	Sign status matrix
SS M	Slow Slew - Month	slow rate of change - month (see: SS - Slow Slew)
SSP	State Safe Program	State safety program (see: Safety Management System )
SSP	Source Selector Panel
SSR	Secondary Surveillance Radar	Secondary surveillance radar; Secondary radar
SSR	Special service request	Extra service - with more detailed description (passenger)
SST	Supersonic transportation	Supersonic transportation
SSTOL	Super short take off and landing	Super short takeoff and short landing
SSTP	Sidestep
SSV	Standard service volumes	Usable areas for VOR
SSV	Static Source Valve
SSW	South-southwest	South-southwest ( cardinal direction )
ST	stratus	Stratus cloud
STA	Scheduled time of arrival (aircraft on block)	Scheduled arrival time (aircraft at the parking position)
STA	station	(Section on the plane)
STA	Supplemental Type Approval	(Canada)
STA	Straight in approach	Straight approach
STA	Security Threat Assessment
ROD	Stabilizer	( Elevator )
ROD	Stabilization	Button to switch on the stabilization of the radar antenna built into the aircraft nose - this is how the disturbing fluctuations in the vertical deflection (when turning, climbing, turbulence) of the horizontally pivoting antenna is compensated for by means of a gyroscope
STANAG	Standardization Agreement
STAR	Standard Arrival Route ; Standard Terminal Arrival Routes	Standard instrument approach route
STARS	Standard Terminal Automation Replacement System
STAT	status	Status
STBY	Standby	Standby, reserve
STC	Supplemental Type Certificate (FAA)	Type approval for modifications or additional equipment of the aircraft
STC	Sensitive Time Control, Sensitivity Time Control
STCA	Supplemental Type Certificate	(Canada)
STCA	Short Term Conflict Alert (System)	Proximity warning system; Collision warning system for air traffic controllers (45–60 s; 5 NM distance; 300 ft altitude difference ), based on secondary radar target tracking
STCM	Stabilizer Trim Control Module	( Boeing 747 )
HOURS	Standard (altimeter setting)	Standard (altimeter setting); Air pressure setting on the altimeter - 1013.25 hPa (see flight altitude ); default; normal
HOURS	default	default
HOURS	Scheduled time of departure (aircraft of block)	Scheduled departure time (aircraft rolls away from the parking position)
HOURS	Synthetic training device	synthetic flight training devices (see Flight and Navigation Procedures Trainer )
STDNT	college student	Student pilot
STF	Stratiform	Stratus clouds -like
STJ	Subtropical jet	Subtropenjetstream; subtropical jet stream
STN	station	station
STNBY	Standby	Standby, reserve
STNR	Stationary	stationary ; constant; stationary
STOBAR	Short Take-Off - But Arrested Recovery	Catapult- assisted take-off (aircraft carrier) - see: Catapult take-off and aircraft catapult
STOL	Short Take Off And Landing	For a short take-off and short landing, see: VTOL
STOPS	Standard Operations
STOVL	Short take-off and vertical landing	Short takeoff and vertical landing; see: VTOL
STPWY	Stopway
STR	Strobe light	Flashlight on the aircraft ( position light )
STR	Straight	Str. Ahead - straight ahead
CTRL	Steering	Steering, steering
STRGHT	Straight	straight; directly
STS	status	Priority treatment, condition
STS	System status	System state
STS	Status indicator
STS	Reasons for Specific Handling	specified in the flight plan - e.g. B. STS / EMER - Emergency; STS / HEAD - Head of State; STS / HOSP - hospital flight; STS / HUM - humanitarian flight;
STS	Space Transportation System	official name for the space shuttle program
STU	Student (pilot)	Student pilot
STW	Slot Tolerance Window
STWL	Stopway Lights
S / U	Startup	Starting the engines
SUA	Special use airspace	Restricted flight area ; Airspace for special use (e.g. control zones or military training area)
SUAS	Special use airspace	Restricted flight area ; Airspace for special use (e.g. control zones or military training area)
SUAV (E)	Strategic Unmanned Air Vehicle (Experimental)
SUBJ	Subject to	are subject to ...
SUC	Start Up Controller
SUC	Start Up Clearance
SUM	Summer period (Central European Summer Time)	Summer period (Central European Summer Time )
SUN	Sunday	Sunday
SUP	Supplement	Supplement (e.g. AIP SUPs)
SUP	supervisor
SUP	Supply	care
SUPP	Supplementary	complement
SUPP	Airport Supplemental Data	Supplementary data on the airfield
SUPP	Heliport Supplemental Data	Supplementary data on the helipad
SUPPS	Regional Supplementary Procedures (ICAO)	regional supplementary procedure
SUR	Start-up request
SUR	Surround	surround
SV	Shuttle valve
SV	Side valves; Flathead	Side valve arrangement (vertical valves) - valves controlled from below - on the aircraft engine
SVC	Service message	Service notification
SVC	service	Operation, service
SVCBL	Serviceable	usable; ready to use
SVCE	service	Service, maintenance
SVCG	Servicing	served
SVFR	Special Visual Flight Rules, Special VFR	Special visual flight rules (if the weather conditions are no longer sufficient for normal VFR)
SVR	Slant visual range	Angular eyeshot of the railway in the landing
SVR	Severe	severe (e.g. SVR ICING)
SVRWX	Severe Weather	severe weather conditions
SW	Southwest	Southwest ( direction )
SW	Switch	counter
S / W	software	software
SWAP	Severe Weather Avoidance Plan	Traffic flow control (see: Air traffic control )
SWB	Southwest Bound	Flying towards the southwest
SWC	Significant Weather Chart	significant weather map
SWC	Stall Warning Computer	( Boeing 747 )
SWL	Single wheel load	Single wheel load
SWS	Stall Warning System	Stall warning system
SWS	Switches	Switch (plural)
SWSL	Supplemental Weather Service Location
SWY	Stopway	Stop lane, stop surface
SYD	Subject your discretion	at their discretion
SYN	Synchronize	synchronize, coordinate
SYNC	Synchronous	synchronous, coordinated
SYS	system	system
SysKontrZ MilFS		System control center of the military air traffic control

to the beginning of the letter - S.

T

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

TA , TB , TC , TD , TE , TF , TG , TH , TI , TJ , TK , TL , TM , TN , TO , TP , TQ , TR , TS , TT , TU , TV , TW , TX , TY , TZ

T	tango	int. spelling alphabet ( ICAO alphabet )
T	Tons (Weight)	Ton (unit)
T	Temperature	temperature
T	Time	time
T	TACAN airway	z. B. TB1 - Tacan Blue One
T	TACAN	Tactical flight navigation aid (military flight navigation procedure)
T	Trainer (aircraft)	Training aircraft (e.g. T-1 ; T-37 ; T-38 ; T-43 )
T	True Bearing	true (e.g. true heading; true course)
TA	Traffic Advisory (from TCAS )
TA	Transition Altitude	Transition altitude (when climbing; from QNH to standard altimeter setting 1013.25 hPa); Transition height at which a switch is made from QNH to QNE (1013.25 mbar). From this height, FL applies as the height specification.
TA	(Airport) turnaround	Turning process (ground handling between arrival and departure)
TA	True Altitude	actual altitude
TAA	Terminal Arrival Area
TAA	Technically Advanced Aircraft	technically advanced aircraft; A general aviation aircraft that has some or all of the following features: modern cockpit automation (moving map GPS , glass cockpit ) for IFR / VFR flight operations, automated engines and system management, integrated autoflight / autopilot system
TAAATS	The Australian Advanced Air Traffic System
TAC	Terminal area chart
TAC	Thrust asymmetry compensation	( Boeing )
TAC	= TACAN
TACAN	Tactical Air Navigation	Tactical flight navigation aid (military flight navigation procedure)
TacEval	Tactical Evaluation	NATO assessment and review process .
TACH	Speedometer	Tachometer (not the airspeed indicator - beware of the trap: wrong friend )
TAD	Terrain Awareness and Display Function	Additional function of the Enhanced Ground Proximity Warning System (EGPWS) compared to the Ground Proximity Warning System (GPWS)
TAF	Terminal Aerodrome Forecast	Airport weather forecast
TAFB	Time away from base	For accounting purposes, the pilot counts the hours he is away from home base every month
TAFS	Tactical Air Reconnaissance Squadron (East German Airforce)	Tactical Reconnaissance Squadron ( Air Force of the National People's Army )
TAFE	Technical and Further Education
TAI	Thermal anti-ice	thermal protection against ice
TAIL	Tailwind	Tailwind
TAR	Terminal Area Surveillance Radar	Roundabout radar; Local traffic area radar
TA / RA	Traffic Advisory and Resolution Advisory	Choice mode on the Traffic Alert and Collision Avoidance System
TAS	True Airspeed	true airspeed; true airspeed in relation to the air; corrected IAS for pressure and temperature. The TAS is around 2% higher than the IAS per 1,000 ft.
TAS	Terminal automation system
TAS	Air Transport Training Wing (East German Airforce)	Transport Aviation Training Squadron ( Air Force of the National People's Army )
DID	Total Air Temperature	Outside temperature with frictional heat; Temperature of the outer shell of the aircraft, includes the outside air temperature (OAT) and the frictional heat of the air.
DID	Turn around time	Time of a settlement period, e.g. B. a repair
TATS	Terminal Area Thunderstorm Service
DEW		see: Traffic Alert and Collision Avoidance System - the area of ​​the protection zone around the aircraft
TAW	Tactical Airlift Wing (USAF)	Tactical Air Transport Squadron ( US Air Force )
TAWS	Terrain Awareness and Warning System, Terrain Alert and Warning System
TAX	Taxying, taxi	rolling, rolling
TB	True Bearing	true angle to an NDB station (ADF)
TB	Turbulence	Turbulence
TBA	To be Advised, To be Announced	is (still) announced
TBCC	Turbine-Based Combined Cycle
TBD	To be Determined; To be defined
TBD	Time Between Decision	Time between decisions ( Boeing )
TBF	To be furnished
TBM	Tracker Ball Markers
TBN	To be notified
TBO	Time Between Overhaul , Overhaul Interval	Overhaul interval (OA) - permissible operating time between overhauls (maintenance interval); Recommended maximum operating time before overhaul
TBS	To be specified
TC	True Course	True course (rwK): the course that the aircraft actually covers, which is shown on the map.
TC	Thrust computer	Thrust computer
TC	Transport Canada
TC	Tropical Cyclone (+ name)	Tropical cyclone
TC	Type Certificate
TC	Temporary change	temporary change (on the aircraft)
TC	Type Certificate	Type certification
TCA	Terminal control area	Urban Area (USA)
T / C	Top Of Climb	End of climb; Point at which the climb ends
T / C	Transfer of Control
TCA	Transport Canada Aviation
TCA	Transport Category Airplanes	Transport aircraft category
TCAP	Tank capacity	Tank capacity
TCAS	Traffic Alert and Collision Avoidance System	Collision warning system; Collision protection system (system installed on board for traffic warning and collision avoidance)
TCAS I	Traffic Alert and Collision Avoidance System	shows every aircraft in a 5-mile radius on a screen in the cockpit (without resolution advisories)
TCAS II	Traffic Alert and Collision Avoidance System	shows each aircraft in a 5-mile radius and indicates the time to a possible collision; Indication of the height difference; Acoustic instructions for climbing or sinking and red / green display on the variometer
TCAS III	Traffic Alert and Collision Avoidance System	like TCAS II, but faster and with a horizontal recommendation to avoid it
T2CAS	Terrain and Traffic Collision Avoidance System
TCC	Thrust control computer
TCC	Traffic Control Center
TCC	Turbine case cooling
TCDS	Type Certificate Data Sheet	Type certification data sheet
TCF	Trim, centering and feel	( Boeing 747 )
TCF	Terrain clearance floor	Additional function of the Enhanced Ground Proximity Warning System (EGPWS) compared to the Ground Proximity Warning System (GPWS)
TCH	Threshold crossing height	Threshold crossing height ; Height at which you fly over the runway threshold. z. B. TCH 50 = threshold is flown over at 50 ft. Only applies to non-precision approaches.
TCH	Touch	touch (see: Touch and Go)
TCHDWN	Touchdown	landing
TCLT	Tentative Calculated Landing Time
TCM	Teledyne Continental Motors	US manufacturer of aircraft engines
TCs	Temporary changeses	temporary changes (to the aircraft)
TCTA	Transcontinental Control Area
TCTP	Tactical Combat Training Programs
TCU	Towering Cumulonimbus	Cumulus congestus - high (large) storm clouds; Source cumulus
TCV	Temperature Control Valve
TCWP	Threshold crossing waypoint
T / D	Top of Descent	Starting point of the descent
T / D	Touchdown	Put on
TDC	Top dead center	top dead center
TDF	Total delayed flights
TDLS	Terminal data link system
TDM	Total delay in minutes
TDMA	Time Division Multiple Access
TDO	tornado
TDOP	Time Dilution of Precision
T-DPI	Target Departure Planning Information Message
TDWR	Terminal Doppler Weather Radar
TDZ	Touchdown zone	Touchdown point
TDZ / CL	Touchdown Zone and Runway Centerline Lighting	Landing zone and center line lights
TDZE	Touchdown Zone Elevation	Height of the touchdown point
TDZL	Touchdown Zone Lights	Touch-down zone lighting
TE	Trailing edge	Wing trailing edge ( wing ); Trailing edge
TE		Total energy; Total energy compensation on the variometer - TE variometer - in contrast to the non-compensated variometer ; a total energy variometer does not show the vertical speed of the aircraft but the change in its total energy per unit of time and per unit of weight; it measures the variation of the total energy (= sum of potential and kinetic energy): very practical in gliders
TEC	Tower En-Route Control
TECR	Technical reason
TEJ	Tropical Easterly Jet	tropical east jet stream
TEL	Telephone	Telephone
TELCOM	Telecommunication Service
TEL-TWEB	Telephone Access to TWEB (Transcribed Weather Broadcast)
TEM	(Illustrated) Tools and Equipment Manual	temperature
TEM	Threat and Error Management	Hazard and error management (in connection with Crew Resource Management - CRM) - a comprehensive safety concept to handle the influences of threatening external factors on the performance in the dynamic working environment of a pilot (external hazards are e.g .: adverse weather, Workload due to the instructions of air traffic control, technical problems, incorrect flap or landing gear position of the aircraft)
TEMP	Temperature	temperature
TEMP	Temporary	temporarily
TEMPO	Temporary	temporary weather change; temporarily (weather key for METAR and TAF )
TEMPS	Temperature	Temperatures
TEO	Temperature Engine Oil	Engine oil temperature
TER	Terminated
TERM	terminal	Terminal building (see: Terminal (air traffic) )
TERPS	Terminal Instrument Procedures (US Standard)
TERR	terrain	ground
TF	Trip Fuel	Fuel for the regularly planned flight route (without reserves, such as: Contingency Fuel, Alternate Fuel, Reserve Fuel, Taxi Fuel, Extra Fuel)
TF	Taxi fuel	Fuel for rolling on the ground
TF	Terrain Following
TFC	traffic	Traffic (example: TFC range rings on the navigation display of the Boeing 737)
TFC PAT	Traffic pattern	Traffic pattern
TFDPS	Tower Flight Data Processing System	Flight data processing and transmission system for space control
TFG	Air transport wing (East German Airforce)	Transport Fliegergeschwader ( Air Force of the National People's Army )
TFM	Traffic flow management
TFR	Temporary flight restriction	often: VIP TFR (on flights of the US President), also around stadiums, nuclear power plants, military target practice areas
TFR	Terrain Following Radar	(military) terrain following radar
TFR	transfer	transmit, relocate (transfer from one place to another); switch the entered standby frequency as the active frequency; activates the standby frequency
TFS	Tactical Fighter Squadron (USAF)
TFW	Tactical Fighter Wing (USAF)
TFX	Tactical Fighter Experimental
TGL	Touch-and-go landing	Put on and take off
TGL	Temporary guidance leaflets	issued by the Joint Aviation Authorities (JAA) Maintenance Division; Existing regulations are explained in TGLs or imminent new, amended or supplemented regulations are pointed out
TGS	Taxiing and Guidance Systems	Taxiway system (see: Taxiway )
TGT	Turbine Gas Temperature	Temperature - measured between the turbine stages - turbofan
TGT	Target	Target (see other aircraft as radar points)
TH	True heading	correct heading; Actual heading on which the aircraft is being flown - orientation of the aircraft nose; Wind (WCA) and compass deviations are included in this heading.
THAIPA	Thai Pilots Associations
THDG	True heading	correct heading
GHG	Transport Helicopter Wing (East German Airforce)	Transport helicopter squadron ( Air Force of the National People's Army )
THL	Threshold lights	Runway threshold lights
THLD	Threshold	Runway threshold
THR	Threshold	Runway threshold - this defined and marked line does not necessarily have to match the actual asphalt surface of the RWY.
THR	Thrust	thrust
THR	Throttle	Thrust lever
THLSH	Threshold	Runway threshold
THROT	Throttle	Thrust lever
THRSH	Threshold	Threshold (maximum or minimum); Runway threshold
THRU	Through	by
THS	Trimmable Horizontal Stabilizer	Tailplane
THS A	Trimmable Horizontal Stabilizer Actuator	Tailplane - "operating lever"
THU	Thursday	Thursday
TI	Thermal index
TIA	Type inspection authorization
TIACA	The International Air Cargo Association
TIBA	Traffic Information Broadcast by Aircraft
TIBS	Transcribed Information Briefing Service; Telephone Information Briefing Service	Aviation and Weather Announcement Announcement - a service provided by AFSS. TIBS includes: route briefing, Aisspace procedures, special announcements.
TIF	Trip Fuel	(the fuel used during the flight)
TIL	until	to
TIM	Travel Information Manual	Travel information guide
TIO	Turbocharger / (Fuel) Injection / (Horizontally) Opposed	Boxer engine with manifold injection and turbocharger (part of the type designation for aircraft engines - e.g. Lycoming IO-540 )
TIP	Until Past (place)
TIS	Traffic Information Service
TIS-B	Traffic Information Service - Broadcast	an air traffic control monitoring system that brings together and displays all available traffic information on a single screen
TIS	Time in service	(previous) operating hours
TIT	Turbine Inlet Temperature	Turbine inlet temperature (see: jet engine )
TIZ	Traffic Information Zone
TJ	Turbojet
TK	Theoretical Knowledge
TKE	Track Angle Error	Storage opposite a radial
TKFF	Take off	Start, departure
TKNCAP	Tank capacity	total fuel tank capacity
TKNO	Ticket Number	Ticket number
TKTL	Ticket time limit	time limit of the flight ticket
TKO	Take off	Start, departure
TKO	tons of kilometers offertes	offered ton-kilometers
TKOF	Take off	Start, departure
TKOF ALTN	Take-Off Alternate	Alternative airport for the starting airport if you have to land again immediately after take-off due to problems and the actual starting airport is below the weather minimum or the runway is too short to land with full tanks
TKS	Weeping Wing Deicing System (anti-ice and de-ice system)	chemical de-icing system. Perforated leading edge that allows de-icing fluid to escape. Can be retrofitted, normal operating time approx. Three hours - glycol with alcohol - see: Aircraft de-icing
TKT	Tonnes Kilometres Transportées	tonne-kilometers worked
TL	Turbine air jet engine	Turbine air jet engine
TL	until	until (time)
TL	Tacan Link	Military connection route between individual TACAN stations (some turning points can also be determined by coordinates; military equivalent to the airways that are directed from VOR to VOR)
TLA	Thrust Lever Angle, Throttle Lever Angle	( Boeing )
TLC	Track-line computer
TLG	Tail landing gear	Tail wheel landing gear - landing gear (aircraft)
TLOF	Touchdown and Lift-Off Area	Touch-down and lift-off area (for helicopter landing pads)
TLR	Temperature Lapse Rate	Temperature decrease over altitude (0.65 ° C / 100 m; 2 ° C / 1000 feet)
TLS	Transponder Landing System	Precision Landing System - based on the Instrument Landing System (ILS) and the transponder
TLS	Target level of safety	(Air traffic control)
TLW	Time Limited WIP (Work in Progress)
TLX	Task load index	Survey procedure to determine a measure of workload (e.g. by pilots); developed by NASA ( TLX questionnaire )
TM	Time	time
TM	Traffic management	Traffic management
TMA	Terminal control area	Near airport area; Local control district; Local traffic - a special sector in the airspace above airports
TMA	Traffic Management Advisory
TMC	Terminal Control Center	Local traffic control center
TMC	Thrust management computer	( Boeing 747 )
TMG	Touring motor gliders	Touring motor glider (self-starting, engine and propeller not retractable) - see: Motor glider (see also light aircraft )
TML	terminal
TMN	True Mach Number	the Indicated Mach Number (IMN) corrected for the position error
TMO	twelve minutes outer marker	Aircraft lands in approx. 12 ′ (formerly 10 miles out, has been adapted over time to the higher speeds of the aircraft)
TMP	Temperature	Temperature; Labeling of the instrument that shows the operating temperature of the engines (turbines) in the cockpit
TMPA	Traffic Management Program Alert
TMPRY	Temporary	temporarily
TMS	Thrust management system	( Boeing 747 )
TMSP	Thrust Mode Select Panel	( Boeing 747 )
TMU	Traffic Management Unit
TMW	Tactical Missile Wing (USAF)
TMZ	Transponder Mandatory Zones	Areas in which a transponder is mandatory
TN	True North	geographically north; true true north - coincides with N on the map
TNA	Turn Altitude
TNH	Turn Height
THP	Thrust horse power	see: thrust , jet engine
TNS	Transitional Surface
TO	Turbocharger / (Horizontally) Opposed	Boxer engine with turbocharger (part of the type designation for aircraft engines )
T / O , TO	Take-off, takeoff	begin
TOAM	Taxi Operations Aircraft Marshaller
TOBT	Target Off Block Time	Planned time for the announcement: "Aircraft Ready" - all handling processes completed, except for pushback and remote aircraft de-icing; Basis for the scheduling and coordination of ground handling, airport and airline
TOC	Top of Climb	End point for the climb ; Rising point; End of the climb
TOC	Total operation costs	Total cost of ownership
TOD , T_O_D	Top of Descent	Start of descent ; Point at which the descent begins
DEATH	Ticket on departure	Ticket deposit at the departure airport
DEATH	Time of delivery
DEATH	Take-Off Distance	Takeoff route
DEATH	Time of day
TODA	Take-Off Distance Available	available take-off distance, results from TORA plus Clearway (CWY) - see: Take-off run
TODR	Take-Off Distance Required	required takeoff distance
TOF	Take-off fuel	Starting fuel amount
TOFL	Takeoff Field Lengths	Runway length
TOGA or TO / GA	Take-Off / Go-Around	Start / go-around; Thrust adjustment mode;
TOGW	Take-Off Gross Weight
TOL	Tolerance	Tolerance (technology)
TOLD cards	Take-Off and Landing Cards	Takeoff and landing cards - with weights and speeds for a specific aircraft
TOP	Take-off performance	Starting performance (starting performance test - TOP test )
TOP	Cloud tops	Cloud ceiling
TOPAZ	Take-Off Performance Advisory System
TOPCASED	T oolkit in Op en Source for C ritical A pplications and S yst e ms D evelopment	Open source tool collection for the development of critical applications and systems - Airbus, together with other companies, is relying on open source software and, with the project, want to provide a software tool collection that covers the entire development process from system specification to implementation in hard - and software covers.
TOPL	Take-off performance limit
GOAL	Time of receipt
GOAL	Take-off run	Take-off run
TORA	Take-Off Run Available	available take-off run
TORR	Take-Off Run Required	required take-off run
TOS	Traffic Orientation Scheme	Another name for RAD (Route Availability Document)
TOSS	Take Off Safety Speed	Safety speed at start - see: V TOSS
DEAD	Time over target	Arrival time above the destination
DEAD	Take off time	Start time
DEAD	Total	total, total
TOTAL O / B	Total on board	Total number of people on board ( passengers plus flight personnel )
TOTRES	Total reserve	entire fuel reserve
TOW	Take-Off Weight	Takeoff weight; Weight of the aircraft at takeoff
TP	Turning point	Course change point, reversal point; Turning point in the missed approach
TP	Aircraft Type	Aircraft type
TP	Tire Pressure	Tire pressure
TPA	Traffic Pattern Altitude	Traffic pattern height (see: traffic pattern )
TPC	Tactical Pilotage Chart
TPI	Tire Pressure Indicator	( Boeing 747 )
TPR	Transponder	Radar Responder
TQ	Torque	Torque (on the propeller - with the lever for the propeller pitch - the speed and thus the torque - TQ - is set) see: controllable pitch propeller
TPS	Takeoff Performance System	(Boeing)
TR	Track	Course over ground
TR	Type rating	Type certification
TR	Temporary revision
TR	Traffic resolution	from the Traffic Alert and Collision Avoidance System
TR	Transformer rectifier	Transformer / rectifier
T / R	Thrust reverse, thrust reverser	Thrust reversal
TRA	Temporary Reserved Airspace	Restricted flight area (literally: temporarily reserved airspace)
TRA	Radar Transfer of Control
TRACON	Terminal Radar Approach Control	Radar approach control
TR OLD	Transition Altitude	Transition height (see: TA)
TRAMON	TRA monitoring unit
TRAN	Transition
TRANS	Transmitter, transmitting; Transmit	Sender, send
TRANS	Transition	Transition from QNH to 1013 hPa (see; TA, TL)
TRANS	Transition	part of the flight route - may be inserted between route and STAR
TRANS	Transient
TRANS ALT	Transition Altitude (TA)	Transition height
Transponder	Made-up word for transmit and respond	The transponder is automatically queried by the secondary radar system on the ground
TRB	Turbulence	turbulence
TRB	turbine	Turbine, engine; Labeling of the instrument that shows the turbine speed in the cockpit - in percent
TRBLNC	Turbulence	turbulence
TRC	Thermal rotor control
TRCV	Tri-Color Visual Approach Slope Indicator
TRE	Type Rating Examiner	Type Certification Examiner
TRE	(Flight Crew) Type Rating Examiner
TRG	training	z. B. Procedures for Air Navigation Services - Training (PANS TRG)
TRI	(Flight Crew) Type Rating Instructor
TRI / TRE	(Flight Crew) Type Rating Instructor / Examiner
TRIP	Trip	Travel; Air travel
TRIP FUEL		Travel fuel requirements (from taking off from the runway to touching down on the runway)
TRK	Track	Course (navigation)
TRL	Transition level	Flight level, which is switched to QNH if it falls below 1013.25 hPa; Transition height (in descent)
TR LEVEL	Transition level	Transition height (see: TRL)
TRLR	Trailer	Pendant; Caravan
TRM	Terminal Instrument Procedures	(SIDs, STARs, IAPs)
TRMH	Terminal Instrument Procedures for Heliports
TRML	terminal	Terminal building (see: Terminal (air traffic) )
TRNFF	Turnoff
TRNG	training	training
TRND	trend	( Flying weather )
TRNPKE	Turnpike	Turning loop
TRNS	Transition	crossing
TROP	Tropopause	Tropopause
TRP	Transponder	Transponder activation recommended
TRP	Thrust rating computer	Thrust power computer (Boeing; for setting the takeoff thrust , also for takeoff thrust derating )
TRQ	Torque	Torque
TRS	Tactical Reconnaissance Squadron (USAF)
TRS	Transformer rectifier	(Plural) see: TR (singular) - transformer / rectifier
TRT	Total rotor thrust
TRSA	Terminal Radar Service Area	Short-range radar
TRSB	Time Reference Scanning Beam (MLS)	(see Microwave Landing System # TRSB principle )
TRTD	Treated	treated
TRTO	Type Rating Training Organization
TRU	Transformer-rectifier unit	Transformer - rectifier (feed: 115 V alternating current, 400 Hz; the transformer turns it into 28 V alternating current and the rectifier then 28 V direct current) - each alternating current bus (115 V) feeds one TRU, which then each feeds a direct current bus (28 V) (Example: B737; other numbers are possible depending on the aircraft model)
TRUNC	Trunk route	Shortened connection route for aircraft with RNAV
TRW		Engine
TRW	Tactical Reconnaissance Wing (USAF)
TS	Thunderstorm	Thunderstorm (weather key for METAR and TAF )
TS	Air Transport Squadron (East German Airforce)	Transport Fliegerstaffel ( Air Force of the National People's Army )
T / S	Trim sheet	Trim plan - as part of the calculation of Weight and Balance (weight and center of gravity calculation )
TSA	Transportation Security Administration (USA)	Formerly part of the Department of Transportation , now with the United States Department of Homeland Security
TSAT	Target startup approval time	(at the airfield)
TSB	Transportation Safety Board of Canada; Bureau de la securité des transports du Canada
TSA	Temporary Segregated Airspace
TSA	Tail Strike Assembly	Palm-sized sensor under the rear of the aircraft that breaks in the event of a tail strike (ground contact of the fuselage rear during take-off) and sends a signal to the cockpit (e.g. Boeing 777-200, -300 and the stretched version of the Boeing 757-300)
TsAGI	Central Aerohydrodynamic Institute	Central Aerohydrodynamic Institute (ZAGI)
TSB	Transportation Safety Board (of Canada)
TSC	Ticket Service Charge	Booking fee
TSC	Turbo supercharged engine
TSD	Traffic situation display	system-wide synthesis of all traffic data
TSFC	Thrust Specific Fuel Consumption	thrust-specific fuel consumption; in contrast to Specific Fuel Consumption (SFC), which refers to the power
TSGR	Thunderstorm With Hail	Thunderstorm with hail
TSI	Time Since Installation
TSLV	Time Since Last Shop Visit	Time period since the last visit to the workshop (e.g. engine)
TSN	(Total) Time Since New	Time since new (manufacture) (seniority of the unit - without considering maintenance)
TSO	Time Since Overhaul	Time since the overhaul (e.g. APU TSO - Auxiliary Power Unit)
TSO	Technical Standard Orders
TT	True track	Legal course; true course (over ground)
TT	Total time	Total time (e.g. total flight time; e.g. 600TT - 600 hours of flight experience)
TT	Teletypewriter	Teletype
TT	Taxi time
TT2	Engine inlet temperature	( Boeing )
TTAE , TTA & E	Total Time Airframe and Engine	Total operating time for airframe and engine
TTAE & P	Total Time Airframe, Engine and Propeller	Total operating time for the airframe , engine and propeller
TTAF	Total time airframe
TTAF & E	Total Time Airframe and Engine
TTC	The Tower Company GmbH	German certified low-cost air traffic control company, subsidiary of DFS GmbH
TTC	Time to climb	Duration for the climb to the cruising altitude
TTF	Trend Type Forecast
TTG	Time to go	remaining flight time (to waypoint or destination)
TTH	Tactical transport helicopter
TTIS	Total time-in service	Total operating time
TTL DIST	Total Distance	Total distance
TTOT	Target Take Off Time	(at the airfield)
TTR	True track	true course over ground
TTR	Terminal transition route
TTR	Target tracking radar
TTSN	Total Time Since New	Total operating time since manufacture
TTSO	Total Time Since Overhaul	Total operating time since overhaul
TUAV	Tactical Unmanned Aerial Vehicle	Combat support UAV
DO	Tuesday	Tuesday
TURB	turbine	turbine
TURB	Turbulence	turbulence
TURBL	Turbulence	turbulence
TVASI; T-VASI	T-Form Visual Approach Slope Indicator	T-shaped glide angle lighting
TVOR	Terminal VOR (Low Power)	VHF rotary radio beacon (low transmission power); VOR in local transport; VOR at close range
TW		Engine
TW	Tail wind	Tailwind (often used in combination: HW / TW; Head Wind / Tail Wind; Headwind / Tailwind)
TW	Taxi Weight	Rolling weight - may usually be greater than the maximum take-off weight
T / W	Thrust / Weight Ratio	Thrust / weight ratio
TWC	Tail Wind Components	Tailwind component; Tailwind portion of the crosswind
TWEB	Transcribed Weather Broadcast	standardized weather forecast - as an endless announcement loop on published frequencies - long wave or medium wave (190 to 535 kHz) and on selected VOR frequencies (108.0 to 117.95 MHz)
TWR	Aerodrome Control Tower	Site control point (or control) - 1. As a control body with its own radio frequency; (Control) tower - 2. as tower (building)
TWY	Taxiway	Taxiway ; Taxiway (no runway !)
TWYL	Taxiway lights	Taxiway - lights (blue lights)
TWYL	Taxiway link
TX	taxi	roll
TX	Time expired	(Aircraft maintenance)
TX	Transponder	Secondary radar transponder (e.g. TX7700 - in emergencies)
TX	Transmitter ; transmission	(Radio) transmitter or (radio) transmission
TXC	Taxiway Centerline Lightning
TXE	Taxiway Edge Lightning
TXI	taxi	roll
TXNG	Taxiing	roll
TXPDR	Transponder	Transponder
TXT	text	text
TXWY	Taxiway	Taxiway ; Taxiway (no runway !)
TYPE	Type of aircraft	Aircraft type (see also: List of aircraft types )
TYPH	Typhoon
TZ	Time zone	Time zone

to the beginning of the letter - T

U

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

UA , UC , UD , UF , UH , UI , UK , UL , UN , UP , UR , US , UT , UU , UW

U	uniform	int. spelling alphabet ( ICAO alphabet )
U	Ultra high frequency	Decimeter waves
U	Upper	upper ( airway )
U	UNICOM	Standard frequency at some airports (USA)
(U)	Unwatched	unmonitored frequency
UA	Routine Pirep, Pilot Report Message Identifier	Routine pilot weather report (USA) ( pilot report )
UAA	Upper Advisory Area
UAB	Until Advised By
UAC	Upper Control Area
UAC	Upper Area Control Center
UACC	Upper Area Control Center	District control point for the upper airspace (air traffic control)
UAD	Upper Advisory Route
UAP	Unauthorized airspace penetration	Unauthorized entry into the airspace; Airspace violation
UAR	Upper Air Route
UAS	Unmanned Aircraft System
UAV	Unmanned Aerial Vehicle	Unmanned aerial vehicle
UAVS	Unmanned Aircraft Vehicle System
UAW	Universal Airwaybill (Cargo Code)	Uniform waybill (of the IATA)
UC	Undercarriage	landing gear
u / c ; uc	Under construction	Construction work
UCM	Unit control message	Information about containers or container numbers on board
U / D; UD	Upper deck	Upper deck - B-747 (e.g. designation of the aircraft cabin on the upper deck: UD)
UCAV	Unmanned Combat Air Vehicle	Combat drone ( unmanned aerial vehicle )
UDA	Upper Advisory Service Area
UDCAT	Upper Deck Catering Vehicle	Uploader
UDF	UHF Direction Finding Station	Decimeter Wave DF - Determines the QDM of an aircraft; UHF bearing station
UFAC	Ufficio federale dell'aviazione civile	(Italian for :) Federal Office of Civil Aviation (FOCA)
UFC	Up-front control panel	(Fighter cockpit)
UFIT	Uncontrolled Flight Into Terrain	uncontrolled flight into the ground (for delimitation see: Controlled flight into the ground ) - Controlled Flight Into Terrain - CFIT
UFN	Until Further Notice	for the time being
UFP	Urgent flight plan	urgent flight schedule
UFT	Undergraduate Flight Training
UH	Utility helicopter	Utility helicopter (e.g. UH-1 Iroquois - the military type designation of the Bell 205)
UHB	Ultra high bypass	Bypass engine; see: Turbofan , bypass ratio
UHBR	Ultra-high bypass ratio engine	(Engines); see: Turbofan , bypass ratio
UHCA	Ultra high capacity aircraft	oversized airliner
UHDT	Unable higher due traffic
UHF	Ultra high frequency	Decimeter waves (approx. 300 to 3,000 MHz)
UHP	Ultra high bypass	Jet engine with high bypass ratio
UIC	Upper Information Center	Headquarters for the upper flight information area
UIMC	Unintended Flight in Instrument Meteorological Conditions	Accidental flight in instrument flight weather conditions
UIR	Upper Flight Information Region	Upper flight information area
UKCAA	United Kingdom Civil Aviation Authority
VHF	Very high frequency	Ultra-short waves
UL	Ultralight Aviation	Ultralight aircraft - (more precisely aerial sports equipment) the take-off weight in Europe may be 300 kilograms for single-seaters and 450 kilograms for two-seaters
UL	Upper limits
ULB	Ultrasonic Locator Beacon, Underwater Locator Beacon	(to locate the flight recorder in the water - is only activated by contact with water; transmits at least 30 days at 37.5 kHz, range up to 2 miles; the signal can be localized with a hydrophone ).
ULC	Universal Logic Card
ULC	Urząd Lotnictwa Cywilnego	Polish Aviation Authority
ULD	Unit Load Device (Cargo Code)	Air freight containers - containers and pallets
ULR	Ultra long range	Ultra long haul flights lasting more than 16 hours (long haul flights: 12-16 hours)
UL-SLP		Special landing pad for microlight aircraft
AROUND	Unaccompanied minor	unaccompanied child (6-12 years of age), unaccompanied minors
UMNR	Unaccompanied minor	unaccompanied child (6-12 years of age)
U.N.	(Cargo Code)	Dangerous goods packaging
UNA	Unable	unable; unable
UNAP	Unable to Approve
UNATT	unattended	unattended
UNAVBL	Unavailable	not available
UNCTL	Uncontrolled	uncontrolled
UNF	Unified Fine Wire Thread	(Standard within the Unified Thread Standard , UTS) (see: Thread )
UNICOM; Unicom	Aeronautical Advisory Service; Aeronautical Advisory Station; Aeronautical Advisory Radio Communications Unit (unique COM)	Airfields with only one operating frequency; Universal frequency for the transmission of traffic information between the pilots in the area around the field
UN / ID	UN Identifier (Cargo Code)	Number code of the packaging
Uni Link	Air-to-Ground Datalink	Text and data transmission between aircraft and ground station
UNK	Unknown	unknown
UNKN	Unknown	unknown (e.g. in PIREP for mandatory fields)
UNL	Unlimited	unlimited
UNLC	Unlicensed
UNLGTD	Unlighted	unfired
UNLKD	Unlocked
UNMTO	Unmonitored	unobserved; not monitored
UNREL	Unreliable	unreliable
UNSHD	Unscheduled
UNUSE	Unusable	unusable
UP	Unknown Precipitation	unknown precipitation (with automated weather observation)
UPG	Upgrader	Passenger placed in a higher seat class
UPR	Upper	upper winds (e.g. UPR WINDS)
UR	Upper Air Routes	Airway in the upper airspace - e.g. B. UR15
URAV	Unmanned Reconnaissance Aerial Vehicle	Reconnaissance UAV (unmanned aerial vehicle)
URET	User Request Evaluation Tool	in the 20 FFA Air Route Traffic Control Centers (the US name for Area Control Center (ACC) ) - alerts the controller to foreseeable traffic conflicts and suggests solutions
U / S	Unserviceable	not usable; unusable; Out of service
USAF	US Air Force	US Air Force
USAFE	US Air Force Europe	US Air Force Europe
USAFIB	Army Aviation Flight Information Bulletin (US)
USB	Upper Side Band	upper sideband (VHF)
USB	Upper surface blowing
USBL	Useable	usable
USG	US gallon	US Gallon (see: GAL - Gallon)
USRA	Upper Air Space Special Rules Area
UPS	Uninterruptible Power Supply (UPS)	Uninterruptible power supply
UTA	Upper Control Area	Upper controlled airspace (see: Airspace structure # Upper airspace )
UTB	Uchebno-Trenirowotschnij Bombardirowschtschik, (Russian Учебно-тренировочный бомбардировщик)	School and practice bombers (e.g. Suchoi UTB-2 )
UTC	Coordinated Universal Time; Universal Time Coordinated	Coordinated Universal Time ; World time (has replaced GMT), also known as Zulu time (short: Z)
UTIL	Utility	Useful ...
UTM	Universal Transverse Mercator (Grid)	UTM coordinate system - a uniform meridian strip mapping of the earth with 6 ° wide zone strips
UTS	Unified Thread Standard	Inch thread ( thread )
UUA	Urgent PIREP	urgent PIREP (USA)
UW		Probability of falling below
UWY	Upper Airway	Upper airway

to the beginning of the letter - U

V

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

VA , VB , VC , VD , VE , VF , VG , VH , VI , VL , VM , VN , VO , VP , VR , VS , VT , VV , VW , VX , VY , VZ

V	Victor	int. spelling alphabet ( ICAO alphabet )
V	Victor Airway; VFR Airway (USA)	lower airways (see J - Jet Airways)
V	Varying	variable wind direction (e.g. 290V360 - wind direction varies from 290 ° to 360 °)
V	IN FRONT	VHF rotary radio beacon (see: VOR)
V	Velocity	Speed , airspeed
V	V engine	V-engine (part of the type designation for aircraft engines - e.g. Allison V-1710 )
V	volt	Unit of electrical voltage
V 1	Critical engine failure speed; Decision Speed ​​for Take-off Engine Failure; Takeoff Decision Speed	Start abort speed ; Decision speed up to which a start can be aborted (e.g. B737 approx. 150 kt); Speed ​​of decision in case of engine failure at start ; Speed ​​up to which the start can be aborted if a critical motor fails; if the aircraft is faster than V 1 , then it must also take off in the event of an engine failure; V 1 applies to larger aircraft that have a sufficient and precisely defined climb rate even after an engine failure
V 2	Take-Off Safety Speed, Scheduled Target Speed ​​(for Takeoff)	safe rate of climb; safe take-off speed at which it is still possible to start even if an engine fails (e.g. B737 approx. 160 kt); the lowest speed at which the aircraft can climb after take-off with an engine failure - analogous to V y (Velocity for Best Climb-Rate) with a failed engine - one could also refer to this logic as V y1 ; for jet aircraft it is called "Take-Off Climb Speed" - the speed from 35 ft above the runway to the end of the second climb segment; V 2 is determined by V S ( stall speed ) and V MCA (minimum control speed - airborne)
V 3	All engines screen speed	the all-engines operational speed at the screen height at the start Takeoff is calculated from standstill to a height given by takeoff-screen-height, which is normally 35 feet. While landing 50 ft above the threshold; V 2 +10; analogous to V YSE (single engine best rate of climb)
V 4	All Engines Steady Initial Climb Speed	The speeds V 1 to V 4 are at the start (air) run through in succession - in aeronautical daily life is only for the start V 1 , V R and V 2 in use
V A	Design maneuvering speed; Maximum maneuver speed	maximum maneuvering speed
V AT	Target Threshold Speed, (Last Look Speed), Certified Threshold Speed	Landing threshold speed - the speed at which they should have the last look at the speedometer before the flare (flare) comes in - in this one looks only get out and no longer on the instruments; older British English, practically identical to V REF - reference speed (depending on the flight weight; this is then calculated, for example, + 20 Kt for the climb: VREF + 20) - but the V AT can also add a safety surcharge (due to wind, gusts , turbulence) to the V REF contain
V AT0	Target Threshold Speed for max. extended flaps	V AT for fully extended flaps
V AT1	Target Threshold Speed (one engine out landing)
V AT2	Target Threshold Speed for two engines out landing
V B	Design Speed ​​for Maximum Gust Intensity	maximum maneuver speed with intense gusts of wind - speeds from the vn diagram; Top speed in strong gusts
V C	Design Cruising Speed, Design Cruise Speed	Rated cruising speed; Cruising speed for which the aircraft was designed; a speeds from the vn diagram
V D	Design diving speed	Orbital pitch flight speed; a speeds from the vn diagram
V DF	Demonstrated diving speed	demonstrated orbit inclination flight speed (also indicated as M DF , Vdf / Mdf)
V EF	Speed ​​at Engine Failure, Critical Engine Failure Speed	Take-off speed at which the failure of the critical engine is assumed
V F	Design Flap Speed	Maximum speed with the flaps fully extended - the upper end of the white area on the airspeed indicator
V FC	Final Climb Speed ​​(take-off)
V FE	Maximum Flap Extended Speed, Flap Extend Speed	Speed with extended flaps ; maximum speed with deployed flaps ; Maximum speed at which it is still possible to fly with the flaps set - can be different for the various flap positions
V FO	Flap operating speed	Maximum speed for retracting and extending the flaps
V FR	Flap Retraction Safety Speed
V FS	Flap retraction speed	V-Flaps - speed at which the flaps are retracted (approx. V2 + 30)
V FTO	Final takeoff speed
V g	Ground speed	Speed ​​over ground
V H	Maximum Speed ​​in Level Flight with Maximum Continuous Power
V IMD	Speed ​​for minimum drag
V IMP	Speed ​​for minimum power
V LE	Velocity Landing Gear Extended, Maximum Landing Gear Extended Speed	Top speed with the landing gear extended
V LO ; Vlo	Velocity Landing Gear Operation Landing Gear Operation Speed	Maximum speed at which the landing gear may be retracted or extended, maximum flight speed for retracting or extending the landing gear
V LOF	Velocity Lift-Off, Lift Off Speed, Maximum Lift-Off (unstick) Speed	Take-off speed (when the tire leaves the ground) - only used on jet aircraft (see: Rotating ) Take-off speed
V MAX TIRE	Max Tire Speed	Maximum speed for the aircraft tires
V MBE	Maximum Brake Energy Speed	Maximum speed from which you can brake to a standstill with the wheel brakes
V MC	Minimum Control Speed ​​with the Critical Engine Inoperative	Minimum speed at which a multi-engine aircraft can still be controlled in the event of failure of the critical engine and full load on the remaining engines - marked on the airspeed indicator by the red line see: V MCA
V MCA	Minimum Control Speed ​​- Airborne, Minimum Air Control Speed	(see: Rotation ) - minimum speed at which the aircraft can be flown and controlled under specified conditions; British English: V MCA ; US English: V MC
V MCG	Minimum Control Speed ​​- Ground	(see: Rotation ) - minimum control speed during take-off run on the ground, if the aircraft is to continue take-off - does not apply to light twos
V MCL	Minimum Control Speed ​​for Landing Approach, Minimum Control Speed ​​in Landing Configuration	(all motors work) - (see: Rotating ) - see: V MCG
V MO	Velocity of Maximum Operation. Max operating limit speed	maximum permissible airspeed; maximum permissible airspeed in normal operation
V MS	Minimum speed in the stall	the lowest speed, which in a stall maneuver is achieved
V MT	Minimum threshold speed
V MU	Minimum unstick speed	from this speed on the lift is sufficient to take off without a tail strike; The minimum speed at which an aircraft can take off safely; from this speed on the lift is sufficient to take off without a tail strike; VMU test
V NE	Velocity Never Exceed, Never Exceed Speed	Speed ​​that must never be exceeded; maximum permissible speed - the end of the yellow area on the airspeed indicator - marked with a red line
V NO	Velocity Normal Operations, Normal Operating Speed, (Maximum Structural Cruising Speed)	highest permissible airspeed in normal operation; maximum strength-related cruising speed - the upper end of the green and the beginning of the yellow area on the airspeed indicator
V P	Aquaplaning speed	Aquaplaning speed
V R	Velocity Rotate	Speed ​​at the time of rotation at take-off (nose wheel takes off - aircraft assumes the position for take-off), depending on weight and balance; Rotation speed - at this the control stick has to be pulled to initiate take-off
V REF	Referential Speed, Referential Landing Speed, Landing Reference Speed	Reference speed (depending on the flight weight; this is then calculated, for example, + 20 Kt for the climb: VREF + 20; or in the various phases of the approach VREF + 15, VREF + 15, VREF + 5; e.g. VREF = 156kt - this means VREF + 5 = 161kt, VREF + 10 = 166kt etc.); V REF is the desired speed (target speed) on the last part of the approach (short final). Older British English: V AT : Speed ​​when landing - 50 ft above the threshold of the runway
V S	Stalling speed; Stall speed	Stall speed - minimum constant airspeed at which the aircraft can still be controlled
V S0	Stall Speed ​​in Landing Configuration (Power off, Flaps and Landing Gear extended), Zero Thrust Stall Speed ​​- Flaps extended	Stall speed in landing configuration - with idle, landing gear and flaps in landing configuration - i.e. extended; Stall speed in landing configuration ( flaps , landing gear ) - the end of the white arc on the airspeed indicator - the slowest flyable speed.
V S1	Stall Speed ​​- Power off in Clean Configuration; Zero Thrust Stall Speed ​​- flaps in specific position; Stall Speed ​​in Specific Configuration	Stall speed at idle, landing gear and flaps retracted; Stall speed in cruise configuration (without landing flaps and landing gear extended ); Minimum speed for a certain flap and landing gear position
V S1G	Stalling Speed ​​for a Force Equalling 1 G	Stall speed at 1 G (acceleration)
V S 15	(example) Stalling Speed ​​with 15 Degreed Flap	(Example) Stall speed with 15 degrees flap position
V SR 15	Reference stall speed	Stall speed
V SRO 15	Reference stall speed in the landing configuration	Stall speed in landing configuration
V SR1 15	Reference Stall Speed in a specific configuration	Stall speed in a specific configuration
V SSE	Safe single engine speed	a speed above V S and V MCA - with a certain safety margin in order to be able to safely train simulated engine failures (asymmetrical flight conditions)
V SW 15	speed at which onset of natural or artificial stall warning occurs	Stall Warning Signal Speed ​​Configuration
V TD	Touch-down speed
V TGT	Target speed	Approach speed
V Thr	Target Threshold Speed
V TMAX	Maximum threshold speed	normally V REF +15 - otherwise the runway will be "overshot"
V TOSS	Takeoff Safety Speed ​​for Category A Rotorcraft
V TOSS	Takeoff Safety Speed	the speed at which the aircraft can be safely controlled - in the event of an engine failure (sudden and complete failure of the critical engine while climbing - after take-off) but without guaranteed climbing performance; with a safety margin on V S and V MCA
V x	Velocity for Best Climb-Angle, Best Angle Speed, Best Angle of Climb	Airspeed for the best angle of climb (memorandum: Vx or you are ex - [Exitus]) - it does not go up steeper than with V x ; Speed ​​for maximum angle of climb in relation to the gain in distance to get away from the ground quickly (in the shortest flight distance) - Vx is interesting for overflying obstacles after take-off, afterwards Vy is more effective for climbing; V x mostly applies up to 1500 ft AGL. V x is usually 1.3 times V S0 . V x is used to cross obstacles after takeoff; greatest gain in height on the shortest route.
V XSE	Velocity for Best Single-Engine Climb-Angle	(for two-mots) Airspeed for best angle of climb in the event of failure of one engine and only one remaining engine - analogous to: V YSE , see also: V x
V y	Velocity for Best Climb Rate, Best Rate of Climb Speed	Airspeed for the best rate of climb (per time); with V y you climb the fastest (Best Rate of Climb), even if, in contrast to V x , you cover a further distance; Speed ​​for the best ascent - greatest gain in height in the shortest possible time
V YSE	Best single-engine rate of climb speed	(for two-mots) Airspeed for the best rate of climb in the event of failure of one engine and only one remaining engine - see otherwise: V y ; V YSE varies with the weight of the aircraft - in the case of light twin engines , the manufacturer usually only gives the V YSE for the highest weight, in larger aircraft - with greater variability in weight - the specific weight for the specific V YSE must be known. The blue line on the airspeed indicator shows V YSE for the maximum possible total flight weight - All Up Weight - AUW
VA	Design maneuvering speed	maximum maneuvering speed - see: V A
VA	Volcanic Ash	Volcanic ash (danger) - (weather key for METAR and TAF )
VAA	Volcanic Ash Advisory	Warnings about volcanic ash
VAAC	Volcanic Ash Advisory Center	Volcanic ash forecast center (issues warnings for air traffic, there are 7 areas worldwide with the centers: London, Toulouse, Anchorage, Washington, Montreal, Darwin, Wellington and Tokyo)
VAC	Visual Approach Chart
VAC	Volt AC, Volt Alternating Current	Volt alternating current (e.g. 12 V ~)
VACX	Volt AC, Volt Alternating Current	Volt alternating current (e.g. 24 V ~)
VAD	Visual Approach and Departure	Visual approaches and visual departures
VAL	Visual Approach and Landing Chart	Visual approach and landing map
VAL	Valuable Transport (Cargo Code)	Valuable freight
VAL	in valleys	in valleys ( valley )
VAL	Vertical alarm level	(Air traffic control)
VAPI	Visual Approach Path Indicator
VAR	Magnetic variation	Location dismissal (OM) (angle between MN and TN); Rejection of location, variation, declination
VAR	Visual and Aural Range	in principle a "four-course radio beacon", works in the frequency range 108 to 112 MHz Two overlapping radiation patterns are generated, which differ by different keying in the rhythm of the Morse code 'A' (.-) and 'N' (-.) (ON keying). At the intersection of the two characteristics, the characters A and N complement each other to form a continuous tone, which forms the criterion for a course. The aircraft can be guided on the course by listening to the keys A and N and the continuous tone with a simple radio receiver. In addition to the ON keying, there is also a 90 Hz / 150 Hz modulation which indicates a direction rotated by 90 ° or 270 ° in azimuth. Four-course beacons are no longer set up anew, as VOR beacons can better perform their tasks.
VARS	Vertical and Azimuth Reference System	in navigation systems
VASI	Visual Approach Slope Indicator	Glide angle lighting; Glide path indicator (visual flight); Glide angle display (installed next to the runway)
VASIP	Voluntary Aviation Safety Information Sharing Process
VASIS	Visual Approach Slope Indicator System	Glide angle lighting; optical glide path display; red / red - too deep (motto: red over red - you are dead); white / white - too high; red / white - OK (memo: red over white - you are right)
VAT	Target Threshold Speed	see: V AT
VBS	Vertical beam sensor
VBV	Variable bleed valve
VC	Design cruising speed	Cruising speed for which the aircraft was designed - see: V C
VC		Association cockpit
VC	Vicinity	in the area - within 8 km of the airport (weather code for METAR and TAF )
VCD	Vertical climb and descent
VCH	Version change	Change to the aircraft variant (e.g. from B737-300 to B737-500)
VCM	Vapor cycle machine	Cooling system
VCNTY	Vicinity	Surroundings
VCOA	Visual Climb Over Airport
VCS	Voice communication system
VCS	Voice Command System	voice control
VCSH	Showers in Vicinity	Rain showers in the area
VCY	Vicinity	Surroundings
VDC	Volt DC, Volt Direct Current	z. B. 12 volts direct current
VDF	VHF Direction Finding	VHF DF station - determines the QDM of an aircraft
VDF		Association of German flight managers
VDF / MDF	Demonstrated Flight Diving Speed
VDGS	Visual docking guidance system	visual docking guidance system
VDI	Vertical display indicator	Shows the flight path for the pilot in poor visibility.
VDL	VHF Digital (Data) Link	VHF radio data transmission
VDL2	VHF Digital Link Mode 2	VHF radio data transmission will replace ACARS in the next few years
VDL4	VHF Digital Link Mode 4	VHF radio data transmission , planned further development of VDL2
VDP	Visual Descent Point	Sight sink point
VDR	Very high frequency data radio
VRD	VHF data radio	(e.g. ACARS - Aircraft Communications Addressing and Reporting System)
VE	Visual Exempted
VEC	Visual en-route chart
VEF	Speed ​​at Engine Failure, Critical Engine Failure Speed	Take-off speed at which the failure of the critical engine is assumed
VER	Vertical	perpendicular
VERACC	Vertical acceleration	Vertical acceleration (of the aircraft) - e.g. B. when landing
VERT	Vertical	perpendicular
VERACC	Vertical acceleration	Vertical acceleration
VermZ		Switching center
VEX	Vertical extension	Vertical (height) expansion
VF	Design Flap Speed
VFC	Very Fragile Cargo (Cargo Code)	highly sensitive cargo (very fragile)
VFE	Maximum flap extended speed	highest permissible airspeed with extended flaps
VFE	Variable-Flap Ejector Nozzle	B.
VFE		virtual airplane design
VHF	Very high frequency	Ultra-short wave
VFK	Air Communications Flight (East German Airforce)	Liaison chain ( air force of the National People's Army )
VFR	Visual Flight Rules	Visual flight rules; Visual flight conditions
VFTO	Final takeoff speed	see: V FTO
VFW		United Aviation Technical Works (e.g. VFW-614 )
VG	Vortex Generators	"Vortex generator" to influence the boundary layer - but not a boundary layer fence
VG	Vertical gyro, vertical gyroscope	Gyroscope (with vertical axis of rotation)
VGDS	Visual guidance docking system	visual docking guidance system
VGH	V - Velocity, G - Acceleration, H - Height, VGH Flight Recorder	early flight recorder for speed, acceleration and altitude
VGML	Vegetarian Meal Non Diary (Catering Code)	vegetarian food without dairy products - see: airplane food
VGSI	Visual Glide Slope Indicator	special approach lighting
VGSIS	Visual Glide Slope Indicator System	special approach lighting
VH	Maximum Speed ​​in Level Flight with Maximum Continuous
VHB	Very high bypass	Jet engine with high bypass ratio
VHF	Very high frequency	Ultra-short wave ; High frequency
VHF / DF	VHF Direction Finding	Determination of the direction from the airfield by means of bearing the radio transmitter - with ultra-short wave
VHS	Very high speed	High speed
VI	Vicinity	in the neighborhood
VIA	By way of	over
VIA	Versatile Integrated Avionics	z. B. in the Boeing 717-200
VIB	vibration	Vibrations
VIC	Very Important Cargo (Cargo Code)	very important cargo
VIFF	Vectoring in Forward Flight
VIGV	Variable inlet guide vanes	( Boeing 747 )
VIP	Very important person	Very important person
VIS	Visibility	View; Visibility (ground view)
VIU	Video interface unit
VLA	Very light aircraft	Light aircraft (takeoff weight max. 750 kg; stall speed max. 45 kn)
VLE	Velocity Landing Gear Extended, Landing Gear Extended Operation Speed	highest permissible airspeed with extended landing gear
VLF	Very low frequency	Long wave (LW)
VLJ	Very light jet	very light jet; Minijet - e.g. B. Eclipse 500 ; Cessna Citation Mustang; Diamond D-jet; Adam A700
VLLY	Valley	valley
VLML	Vegetarian Meal Lacto Ovo (Catering Code)	lacto-vegetarian food (see: vegetarian cuisine ) - see: airplane meal
VLO	Velocity Landing Gear Operation, Landing Gear Operation Speed	highest permissible airspeed for retracting or extending the landing gear - see: V LO
VLOF	Lift-off speed	see: V LOF
VLP		Airfield
VLR	Very long range	very long range
VLV	Valve	Valve , flap ( armature )
VMBE	Maximum Brake Energy Speed	maximum speed at which the aircraft can be braked to a standstill on the ground
VMC	Visual Meteorological Conditions	Visual weather conditions; Visual flight weather conditions; Visual flight conditions (see: Visual flight )
VMC	Minimum Control Speed ​​with the Critical Engine Inoperative	see: V MC
VMCA	Air Minimum Control Speed, Minimum Control Speed ​​Air	minimum required speed for aerodynamic control in flight (at max. 5 ° incline)
VMCG	Ground Minimum Control Speed, Minimum Control Speed ​​Ground	minimum speed required for aerodynamic control during take-off - see: V MCG
VMO / MMO	Maximum Operating Limit Speed, Maximum Operating Speed	see: V MO
VMU	Minimum unstick speed	from this speed the lift is sufficient to be able to take off without a tail strike - see: V MU ; VMU test
VNAP	Vertical noise abatement	Vertical noise restriction
VNAV , V NAV	Vertical navigation	Vertical navigation; Ascent / descent
VNC	Visual navigation chart	Visual navigation map
VNE	Velocity Never Exceed	highest permissible flight speed in calm air
VNO	Velocity Normal Operation (maximum structural cruising speed)	highest permissible airspeed
VNV	Dutch Air Line Pilots Association	Association of Dutch commercial pilots
VO	Vertical (Mounted) / (Horizontally) Opposed	vertically installed boxer engine (part of the type designation for aircraft engines - e.g. Lycoming VO-540 )
VOID		void, invalid
VOL	Volume	volume
VOLMET	Meteorological Information for Aircraft In Flight	Weather information for aircraft in flight; Airport weather reports (METAR) and the trend; regional weather report (continuous broadcast)
VOLT	Voltage	Electric voltage
IN FRONT	VHF Omni-directional Radio Range; Very High Frequency Omnidirectional Range; Very high frequency omni range station; VHF Omnidirectional Range;	VHF rotary radio beacon
VOR / DME	VOR with Distance Measuring Equipment	VOR with distance measurement system
VORTAC	VOR and TACAN combination	VOR and TACAN combination
VOT	VOR Airborn Equipment Test Facility, VOR Test Facility	Test before ; VOR test transmitter; VOR receiver test; VOR on-board equipment test system
VOX	Voice	Voice (radio contact by means of spoken word)
VPA	Vertical path angle
VPD	Vehicle or Pedestrian Deviations	Person or motor vehicle on the runway - contrary to the instructions of air traffic control
VPL	Vertical protection level	( Air traffic control )
VR	Rotation speed	Rotation speed (see: Rotating ) - see: V R
VR	Voice recorder
VR	Military Training Route - VFR, VFR Military Training Route	Military training route published on aeronautical charts for military training flights (visual flights - VFR) - similarly for instrument flight, the routes are called IR - Military Training Route - IFR
VRB	variable	Changeable
VRBL	variable	Changeable
VREF	Referential speed; Reference landing speed; Reference speed	see: V REF
VRS	Voice Response System
VS	Stall speed	Stall speed - see: V p
VS	Air Communications Squadron (East German Airforce)	Liaison Squadron ( Air Force of the National People's Army )
V / S	Vertical speed	Rate of climb / descent
VS0	Stall Speed, Power Off, Flaps and Landing Gear Extended	Stall speed with idle, landing gear and flaps in landing configuration - see: V S0
VS1	Stall speed, power off, clean configuration	Stall speed with idle, landing gear and flaps retracted - see: V S1
VSBL	Visible	visible
VSBLTY	Visibility	view
VSCF	Variable Speed ​​Constant Frequency	(a variant of the CSD - Constant Speed ​​Drive)
VSCS	Voice Switching Communications System
VSD	Vertical situation display	Variometer
VSI	Vertical speed indicator	Variometer ; Rate of climb meter
VSL	Vertical speed limit	a resolution advisory in the TCAS
VSOPS	Variable speed operations	Dispatch procedure in which the cost index is determined and used with which the flight arrives at the destination on time.
VSP	Vertical speed	vertical speed (of the wind at Clear Air Turbulence - CAT)
V-speeds	Performance speeds
VSS	Visual Segment Surface	Obstacle clearance for the area below the OCA / H
V / STOL	Vertical / Short Take-Off and Landing	Vertical takeoff / short takeoff and landing, see: STOL
VSV	Variable stator vanes	(on the engine)
VTA	Vertex Time of Arrival
VTC	Visual Terminal Chart
VTHOL	Vertical Take-Off Horizontal Landing	Vertical take-off and horizontal landing, see: STOL
VTK	Vertical track
VTOSS	Takeoff Safety Speed ​​for Category A Rotorcraft
VTC	Visual Terminal Chart
VTG		variable turbine geometry
VTG	Track Made Good and Ground Speed	(Speed: track and speed over ground)
VTK	Vertical track	vertical course (altitude profile)
VTOL	Vertical take-off and landing	Vertical takeoff and landing
VTR	Variable thrust rating	variable performance level
VTR	Variable takeoff rating
VTT	Variable taxi time
VTUAV	Vertical Takeoff and Landing Unmanned Aerial Vehicle	UAV taking off and landing vertically - also called VTOL UAV
VV	Vertical visibility	If the cloud cover is closed (OVC) or the cloud cover cannot be defined, the vertical view is given in feet - rounded hundreds (e.g. VV400) - METAR code
VV	Vice versa	and vice versa; round trip
V / V	Vertical velocity	vertical speed
VVI	Vertical Velocity Indicator	Variometer
VVS	Voenno-Vozdushnie Sili, Военно-воздушные силы	Russian Air Force
VWS	Visual Warning System	Optical warning system (alternating red and green light beams) for Washington DC to inform pilots that they have violated the Washington Air Defense Identification Zone (DCADIZ) or the Flight Restricted Zone (FRZ). The pilot should then immediately contact air traffic control and leave ADIZ.
Vx	Velocity for Best Climb Angle, Best Angle Speed	Airspeed for best angle of climb - see: V x
Vy	Velocity for Best Climb Rate; Best rate of climb speed	Airspeed for best rate of climb - see: V y
VYSE	Best single-engine rate of climb speed	Airspeed for the best rate of climb - see; V YSE
VYW	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - valuable cargo box
VZA	Unit Load Device (ULD)	IATA ID code for a specific type of air cargo container - car transport platform

to the beginning of the letter - V

W.

(to the next letter - X) ... (to the top of the list)

WA , WB , WC , WD , WE , WF , WG , WH , WI , WK , WL , WM , WN , WO , WP , WR , WS , WT , WV , WW , WX , WY

W.	whiskey	int. spelling alphabet ( ICAO alphabet )
W.	West; Western longitude	West; west; west longitude
(W)	Winter time	Winter time
W.	White	White
W.	Watts	watt
W.	Warm	warm
WA	Wind Angle	Angle between wind and course
WA	AIRMET, AIRMET Message Identifier	Aviation weather report (see aviation weather service )
WAAS	Wide area augmentation system	special differential GPS system; improved navigation accuracy through the transmission of correction signals
WAC	World Aeronautical Charts	World Aviation Maps ( Aviation Chart ) - ICAO - 1: 1,000,000
WAFC	World Area Forecast Center	World Area Prediction Center
WAFS	World Area Forecast System	World area forecast system
DARE	Wide area GPS enhancement
WARN	Warning	Warning (e.g. Fire prot det & warn - fire protection detection and warning)
WAT	Weight, altitude, temperature	Weight, height, temperature
WAT limits	Weight, Altitude, Temperature	Weight-Height-Temperature Limits - operational restrictions for takeoff
WATIR	Weather and Terminal Information Rectifier
WATOG	World Airlines Technical Operations Glossary
WATRS	West Atlantic Route System
WAV	Portable Water Vehicle	Freshwater vehicle
WAYPNT	Waypoint	Waypoint
WB	Westbound	flying west
WB	Wide body aircraft	Wide-body aircraft (aircraft with large fuselage )
W&B , W / B	Weight and Balance	Weight and center of gravity calculation for loading and refueling the aircraft
WBAR	Wingbar lights
WBC	Weight and Balance Computer
WBL	Wing buttock line
WBM	Weight and Balance Manual	Manual for weight and center of gravity calculation
WC	Wire Combed
WC	Wind component	Wind component
WCA	Wind Correction Angle	Slip angle , windward angle (L); Lead angle; Angle of heading to compensate for wind drift
WCBD	Wheelchair Dry Cell Battery	Electric wheelchair with dry battery
WCBW	Wheelchair Wet Cell Battery	Electric wheelchair with wet battery
WCHC	Wheelchair Cabin Seat	Wheelchair up to the cabin seat, passenger also needs help in the cabin (paraplegic person)
WCHR	Wheelchair ramp	Wheelchair to the aircraft, passenger can walk but not long distances
WCMP	Wheelchair Manual Power	Wheelchair - operated by hand
WCHS	Wheelchair Step	Wheelchair users, passengers can walk, but cannot climb stairs
WCO	Weapons Control Order
WCO	Weight Control Officer
WCOB	Wheelchair on board	Wheelchair in the passenger cabin
WDI	Wind Direction Indicator	Wind direction indicator (is not just a simple windsock )
WDM	Wiring Diagram Manual
WDSPR	Widespread	far extended
WE		Angle of incidence of wind
WE	Weekend	weekend
WEA	Weather	Weather
WED	Wednesday	Wednesday
WEF	With Effect From	With effect from
WEP	Was emergency power	American expression in World War II; Engine setting above 100% of normal power (maximum rated power) - for a maximum of 5 minutes, a locking wire on the thrust lever was torn through
WES	Warning Electronics System	electronic warning system
WEU	Warning Electronics Unit	( Boeing 747 , Boeing 777 )
WFO	Weather Forecast Office
WFOV HUD	Wide field-of-view head up display	Wide-angle windshield head-up display
WFV	Military aviator usability	Examination or status of usability in a military aircraft
WFZ	Weapons Free Zone
Flat share	Wing	Wing
WGS	World Geodetic System	World Geodetic System ; current: WGS84 - Geodetic reference ellipsoid on which z. B. refers to the satellite-based GPS
WGT	Weight	Weight
WH	Hurricane Advisory
WHCU	Window Heat Control Unit
WHL	Wheel	tires
WHLS	Wheels	Tire (plural)
WHT	White	White - (weather key - military - main cloud base 1500 ft, ground visibility 5 km) (see: color code )
WI	Within	within (the following location) - z. B. WI 07NM RADIUS
WID	Width	Width, breadth
WID-WIO	When in Doubt - Wait it Out	if in doubt, wait
HOW	With immediate effect	with immediate effect; from now on
TIG	Wing in Ground Effect	Ground effect vehicle
WILCO	Will Comply (I have received your message, understand it, and will comply with it.)	Will be done; "I will follow the instructions." (Talk group) - (see also: Air traffic )
WIN	Winter Period (Central European Time)	Winter period ( Central European Time )
WIP	Work in progress	Carrying out work
WISE	Wing-in-Surface-Effect Ship	Ground effect vehicle
WKD	Weekday	working day
WK	Week	week
WKLY	Weekly	weekly
WKN	Weakening	weakening; getting weaker
WKNDS	Weekends	on weekends
WL	Waiting List	Waiting list
WLA	Wing Load Alleviation System	( Boeing 747 )
WM	Wiring manual
WMO	World Meteorological Organization	World Meteorological Organization
WMSC	Weather Message Service Center; Weather Message Switching Center
WND	wind	wind
WNG	Warning	Warning ( direction )
WNTRS	Winter	in winter
WNW	West north west	West-Northwest ( compass direction )
WHERE	Work order	Work instruction
W / O ; WHERE	Without	without
WOC	Wing Operations Center
WOCL	Window of Circadian Low	12:02 am to 5:59 am
WOW	Weight on Wheels	( Boeing 777 )
WP	Waypoint (RNAV)	Waypoint , area navigation route point
WPT	Waypoint	Waypoint (RNAV - area navigation)
WR	Wet runway	wet runway
WRNG	Warning	warning
WS	Wind Shear	Wind shear (weather key for METAR and TAF )
WS	Wind Direction / Wind Speed	Wind direction / wind speed (weather key for METAR and TAF )
WS	SIGMET , SIGMET Message Identifier	important weather report
WS	Wind Shear	Wind shear
W / S	Windshield	Windshield (in the cockpit)
W / S	Wing loading	Wing loading
WSHLD	Windshield	Windshield (in the cockpit)
WSFO	Weather Service Forecast Office, Weather Service Forecast Officer	American Weather Service
WSHFT	Wind shift	Wind displacement
WSI	Weather Service Inc., Weather Service Corporation	a company that compiles weather data for pilot briefing - with the brands Pilotbrief ™, AVcharts ™, Datasuite ™, Energycast ™, Intellicast ™, Mediacast ™, NOWrad ™, Showfx ™, Stormcast ™, WeatherProducer ™ and WeatherWorkstation ™, as well as the service Brands Skycast℠, WeatherPRO℠ and “WSI. Weather When It Really Matters. “℠ - see: Flugwetter
WSO	Weather Service Office	American Weather Service
WSO	Weapons System Officer	Weapons system officer
WSPD	Wind speed	Wind speed
WSPS	Wire Strike Protection System
WSR	Wet snow on runway	wet snow on the runway
WST	Western Standard Time	UTC + 8 hours ( time zone )
WST	Convective SIGMET , Convective SIGMET Message Identifier
WST	Wheel Speed ​​Transducer	important component for measuring the rotation speed of the wheels for the anti-lock braking system (also known as anti-skid wheel speed transducer )
WSW	West south west	West-southwest ( cardinal direction )
WT	Weight	Weight
WT	Watertank	Water tank, water tower
W / T	Wireless Telegraphy	wireless telegraphy , radio telegraphy
W / T	Wind / temperature	Wind / temperature
WTB	Wing tip brake	They have the task of preventing the slats and flaps from extending unevenly or in an uncontrolled manner.
WT / BAL	Weight and Balance	Weight and Balance
WTAI	Wing Thermal Anti-Ising	(see aircraft de- icing )
WTRIS	Wheel To Rudder Interconnect System	The "steering wheel-rudder connection system" supports manual turning when the main hydraulic systems are switched off (failed) and the auxiliary hydraulic system (standby system) is switched on. A small control signal is sent to the rudder system by the "SMYD" (in relation to the steering wheel movement).
WTSPT	Water Sprout	Waterspout (see: Tornado )
W / V	Wind direction and velocity	Wind direction and wind speed
WVML	Western Vegetarian Meal (Catering Code)	vegetarian food (European style) - see: airplane meal
WW		Wind angle
WW	Severe Weather Watch Bulletin	Aviation weather forecast type
W / W	Wheel well	Landing gear well - see landing gear (aircraft)
WX	Weather	Weather
WX ASOS	Weather	Automated weather observation of the airfield (accessible via radio)
WXR	Weather Radar	Weather radar
WX RADAR	Weather radar
WYPT ALT	Waypoint Altitude	Waypoint height

to the beginning of the letter - W

X

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

XB , XC , XD , XF , XH , XI , XM , XN , XO , XP , XQ , XR , XS , XT , XW , XX

X	X ray	int. spelling alphabet ( ICAO alphabet )
X	Unknown	unknown
X	Cross	cross
X	Times	times
X	Experimental (Aircraft)	An aircraft that does not come from a series production (one-off production, test sample); see: List of test aircraft ; Examples of the US military: Bell X-1 and North American X-15
X	Radar Only Frequency
X	On request	on demand
X	X-Ray - Closed	GAFOR weather code for: ground visibility less than 1.5 km (and / or) main cloud base less than 500 ft above the reference area
1X	Failure of an engine	special routes and procedures for the 1X case
2X	Failure of two engines	only makes sense for aircraft with more than two engines
XBAG	Excess baggage	Excess baggage
X-BAND	X-band	8,000-12,000 MHz; see: frequency band
XBAR	Crossbar (of Approach Lighting System)
X-BLD	Cross bleed	"Cross-use" of the bleed air for the engine start, larger twin-engine aircraft are usually started with an auxiliary unit ( APU , ASU ); after the first turbine has started, the second turbine is occasionally started by means of bleed air from the opposite (crossfeed) turbine; When restarting an engine that has failed in the air (inflight start, air start), the airspeed is usually sufficient to turn the stationary engine in the wind current (windmilling start) sufficiently quickly for the take-off process (so that no APU or similar is required); however, if the aircraft is too slow, the stationary engine needs bleed air from the running engine to start it up; In the case of the B737 NG or the B777 , the note "X-BLD" is displayed in the cockpit on the engine instruments (EICAS monitor) above the N2 display for the corresponding engine, to indicate that the aircraft has reached the limits for a normal air start (inflight start envelope) and cross-bleed bleed air is required to start the engine
XC	Cross country	Overland flight
XCM	Extra crew member	additional crew member (usually on the jump seat , possibly a flight trainer in the cockpit or an FAA line check pilot) - also known as an additional crew member (ACM)
XCOP	Cancel coordination point
XCPT	Except	except
XCVR	Transceiver
XDCR	Transducer	Sensor ( sensor technology )
XDUCER	Transducer	Sensor ( sensor technology )
XF	Experimental fighter
X-FEED	Crossfeed	Cross feed (from the other side - compressed air, electricity, fuel, ...)
XFER	transfer	transfer
XFL	Exit flight level
XFMR	transfer	transfer
XFR	transfer
XFSS	Auxiliary Flight Service Center
XHOLD	Cancel Hold
XIFL	Cancel Intermediate Flight Level
XIN	Crossing intentions
XM	Execution Manager
XMET	Cancel METAR
XMISSION	transmission	transmission
XMIT	Transmit	send
XMITR	Transmitter	Channel
Xmits	Transmits	sends, transmitted
XMNS	transmission	transmission
XMTR	Transmitter	Transmitter
XN	Intersection	Intersection, intersection
XNG	Crossing	crossing, crossing
XO	Executive officer	First officer (military) - the Deputy Commanding Officer (Commanding Officer - CO) and the second in the chain of command
XPC	External power contactor	( Boeing 747 )
XPCT	Expect	do you expect
XPLN	Cancel plan
XPD	Transponder	Radar Responder (see: XPDR)
XPDR	Transponder	Radar responder; Made-up word for Engl. transmit (send) and respond (answer), is used to transmit data from board to ground for air traffic control purposes
XPNDR	Transponder	Radar Responder
XPOND	Transponder	Radar Responder
XPT	Exit point of a sector
XQDM	Cancel QDM
XRES	Excess reservation	Passenger with booking canceled
XS	Atmospherics	atmospheric disturbances
XSFL	Cancel Supplementary Flight Level
XSSR	Exit SSR	(SSR = Secondary Surveillance Radar; all-round view secondary radar; secondary radar )
XST	Experimental Survivable Testbed	the DARPA sought Northrop and Lockheed off to a " stealth demonstrator" - the XST - to design.
XTK	Cross track
XTK	Cross Track Distance
XTK	Cross track error
XTK	Cross track
XTRK	Cross track
XTRK	Cross track error
XTRK	Cancel track
XTT	Cross Track Tolerance
XWB	Extra wide body	particularly wide fuselage (see: Airbus A350 -XWB)
XWind	Crosswind	Cross wind
XX	Canceled	flight cancelled
XX	Ryan Air
XX	Heavy	heavy (weather phenomena - e.g. XXRA - heavy rain)
XX +	Very heavy	very difficult

to the beginning of the letter - X

Y

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

YC , YD , YL , YR , YS , YU , YY

Y	Yankee	int. spelling alphabet ( ICAO alphabet )
Y	Yellow	yellow
Y	Coach Economy Class (IATA)	Tourist class ( booking class )
Y	Year	year
Y / C	Economy class	Tourist class ( booking class )
YCZ	Yellow Caution Zone	yellow warning zone of the runway
YD	Yards	Yard (unit of length)
Y / D	Yaw Damper	Yaw damper (to suppress Dutch roll )
YLO	Yellow	yellow - (weather key - military - main cloud base 300 ft, ground view 1.6 km) (see: color code )
YR	Year	year
YR	Your / s	her
YSAS	Yaw Stability Augmentation System
YY	Year	Year (two-digit format)
YYYY	Year	Year (four-digit format)

to the beginning of the letter - Y

Z

(to the top of the list)

ZA , ZB , ZE , ZF , ZI , ZK , ZL , ZM , ZN , ZO , ZP , ZT , ZU , ZV , ZZ

Z	Zulu	int. spelling alphabet ( ICAO alphabet )
Z	VHF station marker at NDB
Z	Zulu time	UTC ( Coordinated Universal Time ) - e.g. B. 2100Z
ZA	South Africa	South Africa (ISO country code)
ZAGI	(Russian) Централный Аерогидродинамический Институт	Central Aerohydrodynamic Institute
E.g.		Area of ​​responsibility
ZBA		additional special instruction for military air traffic control
ZEL	Zero Length Launch System	Start system without take-off distance (even shorter than STOL ); F104 took off from a standing position with a rocket engine. The rocket engine was set up in a locked area near the airfield. This should make it possible to take off directly from the aircraft bunker, even with bombed airfields. That should preserve the second strike capacity of the Western Air Force against the Eastern Bloc. (Synonyms: ZLL, ZLTO, ZELL)
CELL	Zero Length Launch System	Start system without take-off distance (even shorter than STOL ) (synonyms: ZLL, ZLTO, ZEL)
ZFB		Center for Flight Simulation Berlin GmbH - in the Institute for Aerospace at the Technical University of Berlin
ZFBO		Civil Airfield Operating Regulations (Austria)
ZFCG	Zero Fuel Center of Gravity	Focus of the aircraft at Zero Fuel Weight (ZFW)
ZFM	Zero fuel mass	Weight of the aircraft from DOM (Dry Operating Mass) plus payload , i.e. passengers and / or freight but without fuel
ZFW	Zero Fuel Weight	see ZFM	ZIF	Zero insertion force	electrical connection via "Zero Insertion Force" contacts
ZKP	Central Strip Printing	central correction station (DFS)
ZKSD	Central Strip Printing	central control strip printing (DFS)
ZLL	Zero Length Launch System	Start system without take-off route (even shorter than STOL ) (synonyms: ZLTO, ZEL, ZELL)
ZLLV		Civil Aircraft and Civil Aviation Equipment Ordinance (Austria)
ZLTO	Zero Length Take-Off System	Start system without take-off route (even shorter than STOL ) (synonyms: ZLL, ZEL, ZELL)
ZLW	German Journal of Air and Space Law	Journal of Air and Space Law
ZLZV		Noise Permit Ordinance (Austria)
ZM	Zone marker	Part of a VHF fan beacon
ZMU	Zone Power Management Unit	( Boeing )
ZNY	New York Air Route Traffic Control Center
ZOC	Zone of Convergence
ZOE	Zone d'Echange
ZPC	Zone Power Converter
ZT	Zone time
ZTL	Twin-Spool Turbofan Engine	Twin- flow turbine air jet engine - special (nowadays most widespread) form of the jet engine with separation of core (hot) and bypass flow (cold); Dual-circuit turbine air jet engine
Zulu	Zulu time	Greenwich Mean Time (GMT) or Universal Time Coordinated (UTC); World time
ZVF		Civil airport regulations (Austria)
ZVF	Zero Velocity Filter
ZZ		ZZ procedure (1930 - ground-based instrument landing procedure )

to the beginning of the letter - Z ... (to the beginning of the list)

to the letter A

Individual evidence

1. ↑ Archived copy ( Memento of the original dated August 2, 2008 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.