What does ASDA represent?

ASDA stands for Accelerate-Stop Distance Available. This term is crucial in flight operations as it pertains specifically to the length of runway and stopway available for a pilot to safely abort a takeoff in the event of an engine failure during the takeoff roll. By including both the runway length and any stopway, ASDA provides a comprehensive measure of the distance required for a safe deceleration and stop after a decision is made to abort takeoff.

Understanding ASDA is particularly important for safety and operational efficiency during the takeoff phase, where engine failures can occur. The pilot must know that they have sufficient distance to stop safely, ensuring compliance with safety regulations and minimizing risk.

While other concepts may relate to distances for various flight operations, ASDA specifically focuses on the critical scenario of an engine failure during takeoff and the necessary distances to manage that scenario effectively.