(2)
Access Panel
119BL Main Equipment Center
D.
Prepare for the System Test
S 865-080
(1) Make sure these switches, on the hydraulic control panel, are in the OFF position:
(a)
L and R HYD PUMPS ELEC
(b)
C HYD PUMPS ELEC 1 and 2
(c)
L and R HYD PUMPS ENG.
S 865-081
(2)
Make sure the RESERVE BRAKE switch, on the captain's main instrument panel, P1, is in the OFF position.
(3)
Supply electrical power (AMM 24-22-00/201).
S 865-082
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29-11-00
ALL ú ú 04 Page 512 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 865-083
CAUTION: YOU MUST PRESSURIZE THE RESERVOIR IN THE CENTER HYDRAULIC
_______ SYSTEM BEFORE YOU OPERATE THE ALTERNATING CURRENT MOTOR PUMPS (ACMP) IN THE CENTER HYDRAULIC SYSTEM. IF YOU OPERATE AN ACMP WITHOUT PRESSURE IN THE RESERVOIR, DAMAGE TO THE ACMP CAN OCCUR.
(4) Pressurize the reservoir in the center hydraulic system, if there is no pressure in the pneumatic system (AMM 29-11-00/201).
S 215-084
CAUTION: DO NOT OPERATE THE HYDRAULIC PUMPS AFTER THE HYDRAULIC
_______ TEMPERATURE INDICATION ON EICAS IS MORE THAN 100°C (212°F) OR AFTER THE PUMP OVERHEAT LIGHT COMES ON. IF YOU CONTINUE TO OPERATE THE PUMPS, THE HYDRAULIC FLUID CAN BECOME TOO HOT.
(5)
Make sure there is not less than 600 gallons (4020 pounds/1827 kilograms) of fuel in each main fuel tank.
S 865-085
(6)
If the fuel tank contains less than 4020 pounds of fuel, do these steps:
(a)
Stop the operation of the pump if the hydraulic temperature indication on EICAS is more than 100°C (212°F) or if the pump overheat light comes on.
(b)
Do not operate the hydraulic pump more than 10 minutes.
(c)
After the operation of the pump, let the temperature of the pump decrease for 20 minutes with the pump off.
S 865-086
(7) Make sure these circuit breakers on the overhead panel, P11, are closed:
(a) 11D28, HYDRAULIC ENG PUMP SOV L or
HYDRAULIC ENG PUMP SUPPLY LEFT
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 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(71)
