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C. Two auxiliary hydraulic systems provide reserve power. These are the ram air turbine (RAT) and the power transfer unit (PTU).
D. A ground servicing system fills all hydraulic reservoirs from one location.
E. The indicating systems inform the pilots of the operating conditions of
each hydraulic system.Main Hydraulic Systems (Fig 2)
______________________
A. The center system components are located in the aft left wing/body fairing. The pressure sources for the center system are two alternating current motor pumps (ACMP). When the ELEC pump select switches are in the ON position, the ACMP's run all the time.
B. The left and right system components are located on each engine, engine strut, and main wheel well forward fairing. The pressure sources for each of the left and right systems consist of one engine driven pump (EDP) and one alternating current motor pump (ACMP). The EDP runs all the time that the engine is running. When the ELEC pump switch is ON, the ACMP runs all the time.
C. Each hydraulic system has a fluid reservoir which is pressurized by air from the pneumatic system. Filter modules clean the fluid after being pressurized or after passing through the pump case drain and after returning from user systems. Heat exchangers in the fuel tanks cool the pump case drain fluid before it returns to the reservoir.
D. Ground power connections are provided in each engine strut and in the aft left wing/body fairing for attachment of an external hydraulic pressure source.
Auxiliary Hydraulic Systems
___________________________
A. The ram air turbine (RAT) is stowed in the aft right wing/body fairing. The RAT consists of a hinged strut with a hydraulic pump powered by a ram air driven turbine. The RAT deploys automatically if power is lost in both engines. The RAT can be deployed manually with the RAT deployment switch in the flight compartment. The RAT supplies pressure to the center system for operation of the flight controls.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
LEFT SYSTEM___________ CENTER SYSTEM RIGHT SYSTEM____________
LEFT ENGINE RIGHT ENGINE
AILERONS
FLIGHT SPOILERS
ELEVATORS ELEVATOR FEEL
STABILIZER TRIM
RUDDER
AUTOPILOT
GROUND SPOILERS
HIGH LIFT DEVICES
BRAKES
THRUST REVERSER
GEAR, STEERING
RAM AIR TURBINE
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本文链接地址：757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(7)
