Plain English Meaning

A landing gear system that combines two power sources: electricity to run a small pump, and hydraulic fluid pressure to actually push the gear up or down. The pump only runs when the gear is being moved.

Full Definition

A landing gear actuation system that uses an electric motor to drive a hydraulic pump, which then provides the fluid pressure needed to extend and retract the landing gear. The system normally remains depressurized until the pilot selects gear up or down, at which point the pump runs only long enough to move the gear and pressurize the lines.

Context Anchor

Seen in landing gear system descriptions, especially for airplanes where the gear is moved by hydraulic pressure produced or controlled electrically.