What is the function of flaps on an aircraft?

• A. Increases drag
• B. Gives extra lift
• C. Stabilizes at high speed
• D. Provides roll control

Answer: (B)

Flaps are high-lift devices on the trailing edge that, when extended, increase the wing’s camber and effective surface area. This boosts the lift coefficient so the aircraft can generate more lift at lower airspeeds. That capability is crucial for takeoff and landing, allowing slower speeds and shorter runway distances while maintaining control. While extending flaps also adds drag, this is a side effect, not the primary purpose. Stability and roll control come from other surfaces like the horizontal stabilizer and ailerons, not flaps. So the main function is to provide extra lift.