In accelerate-go distance, by the time the aircraft reaches 35 feet of altitude, which speed must be attained?

• A. V1
• B. V2
• C. Vs
• D. Vref

Answer: (B)

In accelerate-go takeoff, the performance standard is to be able to continue the takeoff and climb after an engine failure and reach a safe height. By the time you reach 35 feet above the runway, you must have attained V2. V2 is the takeoff safety speed that ensures you have enough climb performance and directional control with one engine inoperative to continue the takeoff and climb. If you haven’t reached V2 by 35 feet, you don’t have guaranteed performance to clear obstacles on the remaining engine.

V1 is the speed at which you decide to continue or abort the takeoff. Vs is stall speed, the minimum speed for straight-and-level flight. Vref is the landing approach speed.