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+20
• B. V2
• C. Vfto
• D. Vref

Answer: (A)

When performing a takeoff with flaps still extended, you need a solid margin above stall and enough control authority, especially if an engine fails. The speed you hold until you reach the flap retraction altitude is V2 plus 20 knots. V2 gives you the minimum safe climb speed with one engine inoperative, but adding 20 knots accounts for gusts, pilot technique, and the reduced effectiveness of controls as you begin the flap transition. That extra buffer helps ensure you can maintain a safe climb and recover if another issue arises while the airplane is still in the takeoff configuration. Once you reach the flap retraction altitude, you can retract the flaps and continue toward the clean-airspeed target. Other speeds listed do not provide the required margin during this transition phase.

When performing a takeoff with flaps still extended, you need a solid margin above stall and enough control authority, especially if an engine fails. The speed you hold until you reach the flap retraction altitude is V2 plus 20 knots. V2 gives you the minimum safe climb speed with one engine inoperative, but adding 20 knots accounts for gusts, pilot technique, and the reduced effectiveness of controls as you begin the flap transition. That extra buffer helps ensure you can maintain a safe climb and recover if another issue arises while the airplane is still in the takeoff configuration. Once you reach the flap retraction altitude, you can retract the flaps and continue toward the clean-airspeed target. Other speeds listed do not provide the required margin during this transition phase.