High-lift device

High lift devices on an Air New Zealand Boeing 747-400 (ZK-SUH) on arrival to London Heathrow, England. The triple-slotted trailing edge flaps are well displayed and the Krueger flaps on the leading edge also are visible.

In aircraft design and aerospace engineering, a high-lift device is a component or mechanism on an aircraft's wing that increases the amount of lift produced by the wing. The device may be a fixed component, or a movable mechanism which is deployed when required. Common movable high-lift devices include wing flaps and slats. Fixed devices include leading-edge slots, leading edge root extensions, and boundary layer control systems.