偶然损伤额定值(ADR)的确定主要依赖用户(航空公司)和设计部门的经验。本文在对民机结构偶然损伤额定值(ADR)体系做简介的基础上,针对如何通过工程实践确定影响ADR的各因素指标等级,给出了采集工程实践数据的方法,以及统计数据的处理方法,确定出各指标等级。以前起落架舱壁板为例,确定出其ADR及检查间隔,结果与实际相符,验证了方法的正确性,为民机初始维修大纲的制定提供一种有效的方法。 The Accidental Damage Rating (ADR) is determined primarily by the user (airline) and design department experience. Based on the brief introduction of accidental damage rating system (ADR) of civil aircraft structure, this paper gives a method of how to collect the engineering practice data and how to deal with the statistical data , Determine the level of each indicator. The former landing gear bulkhead as an example, to determine the ADR and check the interval, the results with the actual, verify the correctness of the method for civil aircraft initial maintenance outline to provide an effective method.