五、发动机系统维护
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发动机系统是飞机的核心动力系统，除了提供飞行动力外，还为飞机发电机提供动力、为空调系统提供引气等。
典型维护案例：发动机整流门打开和关闭。步骤如下：
1. 打开整流门
演示视频：(点击图片进入)
视频解说词：Opening and closing of the engine cowl doors.Before working on the engine, initial precautions have to be taken in the cockpit.On panel 115 VU, put a warning notice stating not to start the engine. Make sure that the engine has been shut down for at least 5 minutes and that the corresponding master lever is in the OFF position. On panel 50 VU make sure that the ON legend of the engine FADEC ground power P/BSW is off and install a warning notice. Then make certain that the slats are retracted and install a warning notice prohibiting use of the slats. If they are extended, retract them.
2. 关闭整流门
演示视频：(点击图片进入)
视频解说词：The fan cowl and the thrust reverser cowl doors can be opened for maintenance and inspection. Opening of the fan cowl door. First unlock the 3 latches on the engine centerline. For each latch, push the latch snap to release the handle. Pull the latch handle until the latch hook releases from its keeper. Manually elevate and support the door at the lower edge. Two hold-open rods are located inside the fan cowl door. Release the hold-open rods from their brackets and connect them to their supports on the fan case. The two hold-open rods must be unlocked to open the fan cowl door. Open the fan cowl door sufficiently to extend the hold-open rods. Manually check the correct engagement of the hold-open rods. Open the second fan cowl door. The other fan cowl door is opened in the same way. Each time check that the locking devices are properly engaged on the hold-open rods. With the fan cowl door opened, the accessories mounted on the fan case and on the accessory gearbox are accessible. There are two opening positions, one at 40 degrees for routine maintenance, and the second at 55 degrees for increased access.