二、TEXT
(1) three separate and independent hydraulic system are provided to power the flight controls, landing gear, and thrust reversers. System A and system B are full-time operating system during flight that share rsesponsibility for all hydraulically powered components. The standby system is operated only on demand.

三个分隔独立的液压系统用以为飞行控制、起落架和反推装置提供动力。 A系统和 B系统在飞行中为全时操作系统，共同负责对所有受液压动力控制的组件进行控制。备用系统只在需要时工作。

(2) System A draulic power operates the following systems: Landing gear Nose wheel steering

Left thrust reverser
Ailerons – power control unit and autopilot actuator
Elevators – power control unit and autopilot actuator.
Elevator feel
Rudder
Inboard flight spoilers 3 and 6
Cround spoilers.
Alternate brakes.
Power transfer unit.

A系统为下列系统提供动力：
起落架
前轮转弯系统
左反推装置
副翼—动力控制组件及自动驾驶作动筒
升降舵—动力控制组件及自动驾驶作动筒
升降舵 FEEL
方向舵
内侧飞行扰流板 3#及 6#
地面扰流板
备用刹车
动力传输组件

(3) System A pressure is provided by one engine driven pump(EDP) and one electric motor driven pump（EMDP). A 28v dc motor operated shutoff valve in the supply line between the reservoir and the engine driven pump is normally open . this valve is closed and stops the flow of hydraulic fluid to the engine when the fire handle is pulled.
A系统压力由一个发动机驱动泵和一个电动免马达驱动泵提供。一个 28v直流免达操作位于油箱及发动机驱动泵之间传送管内的截流阀，正常情况下，它是打开的。当火警手柄拉上时，阀门关闭并停止压力流向发动机。
(4) Normal system configuration is with both pumps operating to output fluid pressurized to 3000 psi through the pressure module to the using system. The pressure module contains pressure filter, low pressure switches, check valves and a pressure relief valve. Cooling and lubricating fluid from the pumps is filtered and routed through a heat exchanger in the number one fuel tank before entering the reservoir. Return fluid from the suing systems is filtered at the return module before entering the reservoir.

系统正常构造是通过操作泵输出 3000PSI的压力，通过压力组件给用户系统。压力组件包括压力油滤，低压开关，单向活门和一个压力释放活门。

(5) Hydraulic system B provides fluid under pressure of 3000 psi to portions of the flight control, landing gear, and thrust reverser systems. System B hydraulic power operates the following system: Main wheel brakes Right thrust reverser Ailerons – power control unit and autopilot actuator. Elevators – power control unit and autopilot actuator. Elevator feel Rudder Outboard flight spoiler 2 and 7 Trailing edge flaps Leading edge flaps and slats Alternate landing gear retraction Alternate nose wheel steering