What is the minimum speed that may be flown until flap retraction altitude?

What is the minimum speed that may be flown until flap retraction altitude?

• A. V2
• B. V2+20
• C. V2+40
• D. V1

Answer: (B)

When taking off and climbing with flaps still extended, you must keep a speed that ensures you can safely continue the takeoff and climb if something goes wrong, and you have enough energy margin to retract the flaps later. V2 is the minimum safe climb speed with the airplane in takeoff configuration, including a margin for an engine failure. However, with flaps still extended, the airplane’s stall speed is higher, and you need extra buffer to accelerate and maintain a positive climb while managing drag. Increasing V2 by 20 knots provides that workable margin, giving you sufficient energy to reach the flap retraction altitude and proceed with flap retraction confidently. That’s why the minimum speed until flap retraction altitude is V2 plus 20 knots. The other options aren’t appropriate because V2 alone doesn’t give enough climb margin with flaps down, V2+40 is a larger than necessary buffer, and V1 is a decision speed related to aborting takeoff, not the speed to maintain during the climb before flaps are retracted.

When taking off and climbing with flaps still extended, you must keep a speed that ensures you can safely continue the takeoff and climb if something goes wrong, and you have enough energy margin to retract the flaps later. V2 is the minimum safe climb speed with the airplane in takeoff configuration, including a margin for an engine failure. However, with flaps still extended, the airplane’s stall speed is higher, and you need extra buffer to accelerate and maintain a positive climb while managing drag. Increasing V2 by 20 knots provides that workable margin, giving you sufficient energy to reach the flap retraction altitude and proceed with flap retraction confidently. That’s why the minimum speed until flap retraction altitude is V2 plus 20 knots.

The other options aren’t appropriate because V2 alone doesn’t give enough climb margin with flaps down, V2+40 is a larger than necessary buffer, and V1 is a decision speed related to aborting takeoff, not the speed to maintain during the climb before flaps are retracted.