What is accelerates-stop distance and when must it be used in planning?

• A. Runway length to accelerate to V1 and take off
• B. Runway length to accelerate to Vr
• C. Runway length to reach V2 and climb to safe altitude
• D. Runway length to accelerate to V1, abort, and come to a stop with maximum braking

Answer: (D)

Accelerate-stop distance is the runway length required to accelerate from the start of the takeoff roll up to V1 and then come to a stop on the runway using maximum braking. It represents what you need if the takeoff is aborted at or before V1 due to an engine failure or other abort reason. In planning, this distance is used to ensure the available runway is long enough to safely reject the takeoff under the actual weight, configuration, weather, and runway conditions. It’s paired with the accelerate-go distance to determine total takeoff distance available, covering both the abort and continue-after-failure scenarios.