What are the Trailing Edge Flaps and how do they operate in takeoff/landing versus in flight?

• A. During takeoff/landing; lift symmetrically to change lift. In flight: independently deflect asymmetrically to aid the ailerons.
• B. During takeoff/landing; deflect asymmetrically to aid the ailerons.
• C. They deflect symmetrically in flight to change lift.
• D. They are located on the leading edge of the wings.

Answer: (A)

Trailing Edge Flaps are high-lift devices on the wing’s trailing edge that increase wing camber and lift at lower speeds. This lets an aircraft rotate sooner and land more steeply or at a slower approach without stalling.

In takeoff and landing, they are deployed symmetrically on both wings to boost lift evenly, which lowers the speed needed for takeoff and the approach speed for landing. When the aircraft is in normal flight, the flaps are retracted for clean, lower-drag cruise, but they can be commanded to deflect asymmetrically to aid the ailerons. This asymmetrical deflection creates a differential lift between wings, providing extra roll authority or stability—useful in slow-speed flight or gusty conditions without relying solely on the ailerons.

The trailing edge location is key—these devices are on the trailing edge, not the leading edge, and they work in concert with but are separate from the ailerons.