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The Accelerate Stop Distance Available ASDA is the length of the take off run available plus the length...

  • A

    of the stopway, if provided.

  • B

    of the clearway, if provided.

  • C

    between V1 and the end of the runway.

  • D

    necessary to stop the aircraft.

Refer to figure.
TODA
The take-off distance available is the take-off run available plus any clearway and cannot be more than 1.5 the TORA. If there is no clearway at the aerodrome, then the take-off distance available will be the same length as the take-off run available.

ASDA
Distance from the start of the take-off run to the nearest point in the direction of take-off at which the aircraft cannot roll over the surface and be brought to rest in case of an aborted take-off without risk of accident. ASDA consists of TORA plus the stopway if available.

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