二、液压系统维护
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液压系统的主要作用是向飞机的操纵舵面、起落架收放、刹车和转弯作动机构，以及发动机反推机构等用户提供液压动力。液压系统的主要勤务工作包括油箱释压、液压油灌充等。
典型维护案例：液压油灌充。
演示视频：(点击图片进入)
视频解说词：Servicing procedure to fill up the green hydraulic reservoir. Some precautions have to be taken. Make sure that the speed brakes and spoilers are retracted, the thrust reversers are stowed , the L/G is extended and the doors closed, the FWD and AFT cargo doors are closed. All the other hydraulic services must be in normal position. To depressurize the green hydraulic system. Make sure the travel ranges and the flight control surfaces are clear. But do not depressurize the system reservoir. So, stop any supply of hydraulic power to the green or yellow systems to the ground connectors. The MLG doors have been opened. Put warning notices in position to tell people not to pressurize the hydraulic systems. Electrical power being available. On the ECAM check the green hydraulic system shows zero. If not, operate the rudder to reduce the pressure to zero. Safety and tag the appropriate C/Bs. In the MLG bay, check that the green reservoir pressure and the green accumulator pressure are normal. Now let's fill the green system. Go to the ground service panel of the yellow system, to remove hand pump handle. On the other side, open green ground service panel. Notice, that is possible to fill any of three hydraulic reservoirs from one place. It is also possible to fill the reservoir with the hydraulic service cart, connected here. So, the hand pump is connected to the shaft of the pump. Above the panel you find the filling hose, removed it's cap. Remove the blanking cap of the pump and connect the filling hose to the filling valve. Put it the other end in hydraulic container. Turn the selector to the green system position. Make sure that on the quantity indicator the green light comes on. Operate the pump. Monitor the increase of the fluid level on the quantity indicator. If there is no electrical power available, the fluid level can be checked on the reservoir itself. Stop the flow when the pointer is at the end of the green line. Turn the selector back to the NEUTRAL position. On the quantity indicator, the green light goes out. If a reservoir is overfilled, you cannot pressurize it correctly and you must drain it. Remove the filling hose and re-install the blanking caps. Put the filling hose back in its cap position. Remove the handle from the hand pump and put it in its cap position of the yellow service panel. Close the ground service panels. C/Bs closed, L/G doors closed.
The working area is clear.