Start release
In aviation, the take-off clearance or take-off permit ( cleared for take-off ) is the approval issued by the responsible air traffic control unit to carry out a take-off with an aircraft .
requirement
At controlled airfields , take-off clearance is required for take-off, because here all movements that are related to taxiing, take-off or landing generally require clearance ( § 25 LuftVO ) by the responsible air traffic control office.
At uncontrolled airfields, on the other hand, the pilot takes off at his own discretion; take-off clearance is not required here (and is not available).
shape
The start clearance is given in the form
- "[Callsign] wind [direction] degrees [speed] knots, runway [designator] cleared for take-off."
- (e.g. "Delta-Echo-Tango-India-Victor wind two-four-zero degrees niner knots runway two-four cleared for take-off." )
or (German)
- "[Callsign] wind [direction] degree [speed] node runway [designation] start free."
- (e.g. "Delta-Echo-Tango-India-Victor Wind two-four-zero degrees nine knots runway two-four start free" )
granted.
Historical development of the start clearance
The previously used expression ready for take-off may no longer be used in aeronautical radio in order to avoid confusion with the actual take-off clearance ( cleared for take-off ). The pilot reports today with the words ready for departure .
In one of the worst aircraft accidents in civil aviation history, the plane disaster in Tenerife , one of the aircraft involved took off despite the lack of take-off clearance. In the fog there was a collision with an oncoming aircraft on the same path, in which 583 people died. As a consequence of this accident, the speaking groups ready for departure and cleared for take-off were set internationally. This means that the term take-off is reserved solely for the take-off release in order to prevent confusion in the occasionally noisy radio traffic . In all other talk groups and in free radio traffic, only "departure" is spoken of ( ready for departure ; say departure time ; departure runway ).
