What is the definition of accelerate start/stop distance?

The term "accelerate start/stop distance" specifically refers to the distance required for an aircraft to reach full power, potentially experience an engine failure, and then come to a stop before reaching the takeoff decision speed (V1). This measure is crucial in aviation safety, particularly during takeoff operations, where it is vital to know how much distance is necessary for an aircraft to safely abort a takeoff if an issue arises after the engines have been powered up.

This calculation takes into account the acceleration phase of the aircraft, the performance capabilities of the engines, and the characteristics of the aircraft in case of an engine failure. It ensures that, before the critical point of VR (rotation speed), the aircraft will come to a complete stop safely without exceeding the available runway length. Calculating this distance enables pilots and flight planners to assess runway requirements and safety margins during takeoff operations, ensuring compliance with regulatory standards and promoting safety in flight operations.