Accelerate-stop distance refers to?

• A. The distance required to accelerate to V1 with all engines at takeoff power, experience an engine failure at V1, and abort the takeoff and bring the airplane to a stop using braking action only (thrust reversing not considered).
• B. The distance required to brake after landing.
• C. The distance to accelerate from V1 to V2.
• D. The distance to stop after an aborted takeoff without braking.

Answer: (A)

Accelerate-stop distance is the runway length needed to reject a takeoff at the decision speed and come to a full stop using braking only, with the takeoff power on up to the moment of abort and an engine failure at V1. It covers the distance to accelerate up to V1, the pilot’s reaction time, and the braking distance to stop, while excluding thrust reversing. This is the scenario pilots plan for to ensure there’s enough runway to stop safely if an engine failure occurs at the critical moment.

Why the other ideas don’t fit: braking after landing is a completely different phase of flight and uses a different distance calculation; accelerating from V1 to V2 describes continued takeoff/climb performance, not a rejected takeoff; stopping after an aborted takeoff without braking is not physically possible since braking is required to stop on the runway.