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| Analysis and Design of Springs on Landing Gear Down-Lock Mechanism |
| YUAN Li 1，YU Sheng 2，ZHONG Sheng 1 ，MA Ying 1，NING Xiaodong 1 |
（1. AVIC Landing-Gear Advanced Manufacturing Corp., Changsha 410200, China;
2. PLA Navy’s Aviation Military Representative Office， Zhuzhou 412000, China） |
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Abstract Springs play a crucial role in airplane landing gear down-lock mechanisms. It is necessary to consider the
coordination between springs in down-lock mechanism and unlock actuator, the springs behavior impact on gear during
retraction and extension, and the free fall situation. The design process of springs on down-lock mechanisms is discussed,
specifications of springs design are listed, a new method different from force analysis is provided, and an example of
springs on down-lock mechanism design is given.
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2017, 
