Leading-edge flap true statement?

• A. They are extended to increase lift
• B. They are extended for takeoffs and landings to increase lift
• C. They decrease camber
• D. They increase drag

Answer: (B)

Leading-edge devices increase the wing’s camber, which raises the lift produced at a given angle of attack. This is especially valuable at low speeds, such as during takeoff and landing, because it allows you to generate enough lift at slower airspeeds and with higher weights. By extending the leading-edge flap, the wing can achieve a higher lift coefficient, delaying stall and enabling shorter takeoff runs and lower approach speeds without needing to increase speed. They’re typically retracted in cruise to reduce drag, though extending them does add drag as a side effect. The key point is that their primary, most useful function is to be extended during takeoffs and landings to increase lift.