民用航空器虽经过型号审定取得相应证书,但可能因某些因素导致其在使用过程中,会遇到各种故障或失效情况。局方和生产商对收集到的各种失效状况进行分析,来判断该飞机或该型机队是否存在不安全状况。本文通过对不安全状态相关规章的分析,结合适航风险分析方法说明了不安全状态的评估和确定。 Although the certification of a civil aircraft has obtained the corresponding certificate of model approval, it may encounter various faults or failure conditions due to certain factors during its use. Bureau and manufacturers analyze the various failure conditions collected to determine whether the aircraft or the fleet is unsafe. In this paper, the unsafe state of the relevant regulations analysis, combined with airworthiness risk analysis methods to explain the assessment and determination of unsafe conditions.