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CCAR 25部《运输类飞机适航标准》对航空发动机的持续转动提出明确要求,即航空发动机的持续转动不会危及飞行安全。参考美国联邦航空局(FAA)第25-141号修正案,详细分析了FAR 25.362条款对发动机失效载荷的要求及其适用的符合性验证方法。通过对服役数据进行统计学分析研究了风车不平衡符合性验证条件。结果表明,不平衡量等于1.0与1 h备降时间组合、不平衡量等于1.0与最大不超过3 h备降时间组合可以满足安全性的要求,在此基础上从载荷、强度、耐久性、系统完整性以及人为因素5个方面开展符合性验证。采用完整的飞机模型和发动机模型进行符合性验证是可以接受的。机体结构模型要通过地面振动试验进行校验,发动机模型要通过风扇叶片脱落试验进行校验。
CCAR Part 25 “Transport Aircraft Airworthiness Standards” sets out a clear requirement for the continued rotation of an aircraft engine that the continued rotation of the aircraft engine will not endanger flight safety. Refer to the FAA Amendment No. 25-141 for a detailed analysis of the requirements of FAR 25.362 for engine failure loads and the applicable method for verifying compliance. Through the statistical analysis of the service data to study the windmill imbalance compliance verification conditions. The results show that the imbalance is equal to 1.0 and 1 h backup time combination, the unbalance amount is equal to 1.0 and the maximum does not exceed 3 h standby time combination can meet the safety requirements, on this basis, from the load, strength, durability, system integrity Sexual and human factors in five aspects of compliance verification. It is acceptable to use a complete airplane model and engine model for compliance verification. The body structure model should be checked by the ground vibration test, and the engine model should be checked by the fan blade falling test.