基于AC25-19A的民机应急门候选审定维修要求分析

Analysis of candidate certification maintenance requirements for civil aircraft emergency doors based on AC25-19A

基于AC25-19A的最新要求,在民机舱门安全性评估过程中,考虑应急门的使用环境、操作频次,识别了隐蔽失效、磨损失效。针对隐蔽失效、磨损失效,建立了舱门系统候选审定维修要求(CCMR)分析流程,并给出了隐蔽故障风险暴露时间及失效概率的计算方法,确定了维修任务内容及间隔,形成了舱门系统候选审定维修要求的分析方法。同时,制定CCMR项目后迭代评估了舱门的安全性影响,结果表明:制定的CCMR项目能在保障安全性指标要求的前提下,及时探查应急门重要的隐蔽失效、磨损失效,CCMR项任务间隔合理。

Based on the latest requirements of AC25-19A,in the safety assessment process of civil aircraft cabin doors,the operating environment and operating frequency of emergency doors should be considered to identify latent failures and wear failures.For latent failures and wear failures,an analysis process for the candidate certification maintenance requirements(CCMR)of the cabin door system was established,and a calculation method for the risk exposure time and failure probability of latent failures was provided.The maintenance task content and interval were determined,forming an analysis method for the candidate certification maintenance requirements of the cabin door system.At the same time,the safety impact of the cabin door was iteratively evaluated after the development of the CCMR project.The results showed that the developed CCMR project can timely detect important latent failures and wear failures of the emergency door while ensuring the safety index requirements,and the task interval of the CCMR project is reasonable.