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(2)
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11D31, HYDRAULIC PTU CONT
(b)
11K15, ELEC PUMP C1
(c)
11K16, ELEC PUMP RIGHT
(d)
11K24, ELEC PUMP C2
(e)
11K25, ELEC PUMP LEFT
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(3)
Operate the primary flight controls or let the internal leakage decrease the system pressure.
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(4)
Monitor the hydraulic pressure indication on EICAS to make sure the pressure decreased.
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(5)
Operate the brake pedals to decrease the pressure in the brake system and the accumulator.
NOTE: The check valves isolate the accumulator in the brake system.
____
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(6) If you installed the hydraulic service cart, remove the cart and install caps on the airplane ground power connections.
E. Remove the Pressure from the Main Hydraulic System Reservoirs
NOTE: If you will loosen hydraulic connections or open the hydraulic
____ system, you must remove the pressure from the hydraulic reservoir.
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(1) For the left or right system, make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
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WARNING: OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2) For the left or right system, open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-00
ALL ú ú 01 Page 215 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
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(3) For the center system, open the access panel 197KL for the central hydraulic service center (AMM 06-41-00/201).
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WARNING: PUT A RAG AROUND THE DEPRESSURIZATION VALVE ON THE RESERVOIR TO
_______ CATCH A SPRAY OF HYDRAULIC FLUID. A SPRAY OF HYDRAULIC FLUID CAN CAUSE INJURY TO PERSONS. IF THE HYDRAULIC FLUID TOUCHES YOUR SKIN, FLUSH THE SKIN WITH WATER. IF THE HYDRAULIC FLUID TOUCHES YOUR EYES, FLUSH THE EYES WITH WATER AND GET MEDICAL AID.
(4)
Put a rag around the depressurization valve on the reservoir to catch a spray of hydraulic fluid from the valve.
S 862-062 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(47)
