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737-800 B17XX飞机起飞后上升至4500米时,右侧SOURCE和GEN OFF BUS灯亮,执行电源断开检查单,启动APU并接通电源后,右侧SORCE OFF灯灭。落地后进行GCU测试有代码IDG FAULT,该故障经过连续三个晚班排故,先后量线,更换GCU、两个IDG,故障依旧。最终如何排除呢?文章在简要回顾737NG交流电源构成和IDG结构原理后,详细分析P5-4板上GEN OFF BUS灯亮问题。
737-800 B17XX When the airplane rises to 4,500 meters after takeoff, the SOURCE and GEN OFF BUS lights on the right and the power off checklist is executed. After the APU is powered on and the power is turned on, the right SORCE OFF lamp goes off. After landing GCU test code IDG FAULT, the failure after three consecutive night shift troubleshooting, the amount of line, replace the GCU, two IDG, the fault still. Finally, how to exclude it? In a brief review of 737NG AC power supply structure and IDG principle, a detailed analysis of the P5-4 board GEN OFF BUS light problem.