Vmcl with Flaps Full equals which value?

• A. 75 knots
• B. 78 knots
• C. 83 knots
• D. 88 knots

Answer: (B)

Minimum control speed in the landing configuration (VMCL) is the lowest airspeed at which the airplane can be controlled when the critical engine is inoperative and the airplane is configured for landing (flaps extended, typically gear and flaps as in landing). When one engine fails, yaw and roll tendencies increase, and having the flaps fully extended changes the aerodynamics by both increasing lift and adding drag, which can reduce controllability if you’re too slow. Because of that, you need to maintain a higher airspeed to ensure you still have enough rudder authority and roll control to counter the asymmetric thrust.

In this airplane’s data, VMCL with flaps full is 78 knots, reflecting that need for a bit higher speed in the landing configuration than in a clean, flaps-up state. The other numbers would correspond to different configurations or conditions, so they don’t apply here.