Definition
High-lift devices mounted on the rear (trailing) edge of the wing — most commonly flaps — that extend or deflect downward to increase lift and drag at lower airspeeds, allowing slower, steeper approaches and shorter takeoff and landing distances.
Plain English
Movable panels along the back edge of the wing that the pilot lowers to help the airplane fly safely at slower speeds, especially during takeoff and landing.
Context Anchor
Seen in flap effectiveness, takeoff, approach, landing, and preflight discussions.
Derivation
‘Trailing’ comes from the idea of something following behind — the back edge of the wing trails the leading edge as the airplane moves forward. So ‘trailing-edge systems’ literally means the devices fitted to the rear edge of the wing.
Why Pilots Care
These systems lower stall speed and shorten takeoff and landing distances, directly affecting safety and runway requirements.
Grounding Statement
When these systems extend, the rear of the wing changes shape so the airplane can make more lift at a slower speed.
Intuition Check
Do not read “systems” as one single part. Here it means a group or category of wing devices, mainly different kinds of flaps, located at the wing’s trailing edge.
Example Sentence 1
Most training airplanes use simple trailing-edge systems — typically plain or slotted flaps — to reduce approach speed during landing.
Example Sentence 2
Proper use of trailing-edge systems allowed the airplane to maintain a safe approach speed with a lower power setting.