Landing gear is an accessory device at the lower part of an aircraft that supports the aircraft during takeoff, landing, or taxiing on the ground (or water surface) and is used for ground (or water surface) movement. The landing gear is a component that supports the entire aircraft, making it an important part of the aircraft; Without it, the airplane cannot move on the ground. After takeoff, the landing gear can be retracted depending on the performance of the aircraft.
The retraction system generally uses hydraulic pressure as the normal retraction power source, and air conditioning and electricity as backup power sources. Generally, the front landing gear is retracted forward into the front fuselage, while the front landing gear of some heavy transport aircraft is retracted laterally. The retractable form of the main landing gear can be roughly divided into wingspan directional retraction and chord directional retraction. The retractable position lock is used to lock the landing gear in the retracted and lowered positions, to prevent the landing gear from automatically retracting during flight and automatically retracting when impacted. For retractable systems, there are usually position indication and warning systems.
server