What is the accelerate stop distance available (ASDA)?

The accelerate stop distance available (ASDA) is defined as the total length of the takeoff run available combined with any stopway that may be present. This measurement is crucial for ensuring that an aircraft can safely accelerate to the takeoff decision speed and, if necessary, stop on the runway prior to taking off. The stopway is a designated area beyond the runway that can be used for stopping an aircraft in case of an aborted takeoff.

Understanding ASDA helps pilots and flight planners determine whether an aircraft can safely take off from a specific runway, considering the aircraft's weight, weather conditions, and various other performance factors. The other options do not provide a complete or accurate definition of ASDA: one refers only to the takeoff speed without considering stopping distances, another describes the total distance of a runway without incorporating the stopway, and the last option pertains to flight maneuvers instead of takeoff and stopping capabilities.