In order to ensure success assembly of the aircraft landing gear, two error sensitivity analysis methodologies was studied. The main landing gears for the aircraft are developed as the prototype. The sensitivity model is established based on the total differential error by the probability method. The 3DCS software was used as the simulation tool. The paper has analyzed the static assembly process for the landing gear, studied the sensitivity of the assemble rings. The results of the two methods were given and they are approximately equivalent. The contribution of the link between the top joint and the rod 2 is 31.7%, the contribution of the link between the foot joint and the rod 1 is 45.3%, they are both very large.%为了更好地保证飞机起落架收放机构的装配成功率,对2种收放机构误差灵敏度分析方法进行对比研究.以正在研发的某大型民机主起落架收放机构为原型,建立基于误差全微分和基于概率方法的2种误差灵敏度分析模型,并基于3DCS软件,分析起落架的静态装配过程,研究各环节误差对装配封闭环的灵敏度影响大小,并对基于概率的分析方法进行仿真分析.仿真结果表明:2种分析方法的灵敏度基本一致,上扭结与上侧杆的连接处对尺寸链1封闭环的影响较大,达到31.7％；上、下锁杆连接处对尺寸链2封闭环的影响尤大,达到45.3％.
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