Type Rating Law Practice Test

ASDA is the distance available for the takeoff attempt to accelerate and, if the takeoff is aborted, to stop safely. The key is that it starts with the takeoff run available (TORA) and, if a stopway is provided, adds that length to give the total distance usable for stopping during an aborted takeoff.

Why this fits: the stopway is specifically designed to provide extra distance for deceleration if the engine or takeoff plan fails during the takeoff run. Clearways, while part of other takeoff distance concepts, are not included in ASDA because they are not intended for stopping during an aborted takeoff. The full runway length isn’t used in this measure either; ASDA is built from TORA plus any stopway, not the entire runway length.

So the correct description is the takeoff run available plus the stopway (if provided); if no stopway exists, ASDA equals TORA.