Term

flap

Daniel MarkFounder & Editor, Aviatopia
Published Mar 1, 2026Updated Mar 1, 20261 min read

A high-lift device on the trailing edge of the wing that increases both lift and drag when extended — used to reduce takeoff and landing speeds.

aviation-glossary

Quick Facts

Type
High-Lift Device
Definition
A high-lift device on the trailing edge of the wing that increases both lift ...
Used By
Pilots

Definition#

Flaps are hinged or extendable surfaces on the trailing edge of the wing that increase the wing's camber and area when deployed. They increase lift at lower speeds and also increase drag.

Why It Matters Operationally#

Flaps allow lower approach and landing speeds, shorter takeoff rolls, and steeper descent angles. Different flap settings balance lift increase against drag penalty.

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