Flaps deploy downward from the trailing edge of a wing to change its camber and increase both lift and drag. Pilots extend them during takeoff to get airborne at lower speeds, and during approach to allow a steeper descent without accelerating. Retracting them cleans up the wing for high-speed cruise.
Set flaps to 15 degrees for the short field takeoff.
A common rookie mistake is flying too fast with flaps extended, which can overstress or rip the tracks right off the wing.
Related terms
Trailing edge
The rearmost margin of an airfoil where the upper and lower airflows rejoin.
Fowler flap
A type of wing flap that slides backward before hinging downward.
Slat
An aerodynamic surface on the leading edge of a wing that extends to increase lift at low speeds.
Control surface
A movable aerodynamic flap or panel used to steer and stabilize an aircraft in flight.