accelerate-stop distance available

accelerate-stop distance available (ASDA)

The runway length required for an aircraft to accelerate to a specified speed and, then, in the case of an engine failure, be able to stop safely on the runway. It is equal to the length of the takeoff run available plus the length of the stop-way, if provided. The ASDA is dependent on factors such as aircraft weight, ambient temperature, altitude of the airfield, and wind. Its values are given in aircraft manuals. Also called emergency distance.