Plain English Meaning
A small electric motor that turns a screw to push the landing gear down or pull it up. The motor does the lifting work that hydraulic pressure does in other airplanes.
Full Definition
A mechanical lifting device powered by an electric motor, used in some retractable landing gear systems to extend and retract the gear by driving a screw jack or similar linear actuator at each gear leg.
Context Anchor
Seen in retractable landing gear systems, especially when describing how the gear is moved up or down after the pilot selects a gear position.
Derivation
A 'jack' has long meant a device for lifting heavy loads — the same idea as a car jack. 'Electrically-driven' simply means an electric motor provides the force instead of a or .