Plain English Meaning

Tube-shaped parts that use pressurized fluid or air to push or pull aircraft parts in and out, like the legs of the landing gear or the flaps on the wings.

Full Definition

Hydraulic or pneumatic devices that convert fluid pressure into linear (straight-line) mechanical movement, used to extend or retract aircraft components such as landing gear, flaps, brakes, and control surfaces.

Context Anchor

Seen during preflight inspection, especially when checking retractable landing gear areas for leaks, damage, loose hardware, or .