Landing gear retraction/extension device of aircraft

摘要

A landing gear retraction/extension device includes a hydraulic actuator (2), a hydraulic circuit, a hydraulic pump (5), an electric motor (6), and a driver (61). Part of the hydraulic circuit is provided such that heat is exchangeable between operation oil and each of the electric motor (6) and the driver (61). The driver (61) supplies power to the electric motor before landing of an aircraft such that an operation oil temperature is higher than a predetermined temperature upon the landing of the aircraft.