某型航空发动机外场使用过程中连续出现多台压气机第5级转子叶片掉块故障,通过对叶片复查、外场使用情况调查、理化分析、以往故障情况研究等手段,确定故障原因为振动疲劳断裂,在此基础上,对厂内制造改进过程及外场使用控制措施等提出了建议。 During the field operation of a certain type of aeroengine, the failure of the fifth stage rotor blades of multiple compressors occurred continuously in the field. Through the review of the blades, the investigation of the external field use, the physical and chemical analysis and the study of the past failure conditions, the cause of the failure was determined as the vibration fatigue fracture , On this basis, the factory made the improvement process and field use control measures are proposed.