四、电源系统维护
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电源系统的主要作用是为飞机的用电设备提供电能，包括供电和配电两大系统。电源系统的主要勤务工作包括IDG的拆装等。
典型维护案例：IDG拆装。步骤如下：
1. IDG拆卸
演示视频：(点击图片进入)
视频解说词：Before removing the IDG the engine must be shutdown for at least 5 minutes to prevent burns because the oil stays hot for a few minutes. First of all, the IDG must be drained and the oil tube disconnected and removed. Also remove the banjo couplings and note their initial position, then disconnect the three electrical connectors from the IDG. Remove the cover plate of the IDG terminal box and disconnect the output cables. Next, place the special dolly in position and raise it up to the IDG. When the IDG is on the dolly release the Quick Attach/Detach coupling, then pull the IDG forward to disengage it.
2. IDG安装
演示视频：(点击图片进入)
视频解说词：Using the dolly, lift the IDG up to its position and align the open marks on the Quick Attach/Detach coupling. When the IDG is engaged tighten the coupling sufficiently to secure it, then remove the dolly, reconnect the electrical connectors and reinstall the oil tubes.