The landing gear lifetime is estimated based on the safe-life design concept and its design requires thorough calculations. The individual parts and sub-assemblies must be sensibly designed to function safely and efficiently for the specified design lifetime without failure. In a design process of a main landing gear system, the kinematics/mechanisms analysis shall be first carried out as a primary task for feasibility of the gear retraction/extension with the satisfactory link paths. This paper presents the analytical kinematics analysis of a complex mechanism involving multiple four-bar linkages with multiple coupler points of the main landing gear (MLG) of CN-235 aircraft. The kinematics analyses were performed in order to figure out the overall link positions of the main landing gear mechanism and make scenarios of a deformed component from its designed geometry for possibilities of a lock failed position.

起落架的使用寿命是根据安全寿命设计概念估算的，其设计需要进行彻底的计算。必须合理设计各个零件和子组件，以在指定的设计寿命内安全有效地运行，而不会出现故障。在主起落架系统的设计过程中，应首先进行运动学/力学分析，作为具有令人满意的连杆路径的齿轮缩回/伸展可行性的主要任务。本文介绍了一种复杂的机构的运动学分析，该机构涉及CN-235飞机主起落架（MLG）的多个四连杆机构和多个耦合点。