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1故障描述2013年1月20日,航前B-2337飞机在用APU引气启动发动机时,左右双发皆不能起动且APU显示低压,经过多次观察,最终发现P1流量控制活门(FCV)在发动机启动时不能及时关闭,从而造成APU引气压力低、启动发动机压力不足。2原理分析空调流量控制活门有一个专门的关断电磁线圈如图(1),当电磁线圈被触发时,FCV就会关断,其中触发的条件如下:
1 Fault Description January 20, 2013, before the flight B-2337 aircraft in the APU bleed air to start the engine, both left and right can not start and APU shows low pressure, after many observations, eventually found P1 flow control valve (FCV) When the engine starts can not be closed in time, resulting in APU bleed air pressure is low, start the engine pressure is not enough. 2 Principle Analysis Air flow control valve has a dedicated turn-off solenoid coil (1), when the solenoid is triggered, FCV will be shut down, the trigger conditions are as follows: