介绍了一起由于插头空钉磨损产生的金属未引起运七发动机顺桨系统线路短路，造成空中停车的特殊故障，指出该故障具有一定的普遍性，并提出了一些防范措施。故障现象1996年11月9日，东方航空公司安徽分公司一架运七B－8459号飞机更换左右到寿发动机后，进行正常的空中试飞检查 This paper introduces a special fault caused by metal abrasion caused by the wear of the plug nails, which causes short circuit of the feathering system of Yun-7 engine and causes air parking. It is pointed out that the fault has some universality and some preventive measures are given. Symptom On November 9, 1996, a carrier of Air China B-8459 at Anhui Branch of the China Eastern Airlines Company changed its normal life test after replacing the engine to the left