(2)
The installation of the air charging valve for a hydraulic pressure surge accumulator.
B.
There are three hydraulic pressure surge accumulators on the airplane. The surge accumulator for the right wing gear brakes is adjacent to the rear spar of the right wing. It is found inboard of the right wing gear trunnion. The surge accumulator for the left wing gear brakes is adjacent to the rear spar of the left wing. It is found inboard of the left wing gear trunnion. The surge accumulator for the two sets of body gear brakes is on the inboard bulkhead of the right body gear wheel well. Adjacent to each surge accumulator is an air charging valve. The valve is used to fill the accumulator that it is adjacent to.
C.
You can use this procedure to remove or install all of the hydraulic pressure surge accumulator air charging valves.
TASK 32-41-23-004-001
2. Hydraulic Pressure Surge Accumulator Air Charging Valve - Removal (Fig. 401)_________________________________________________________________
A. General
(1)
In subsequent steps the hydraulic pressure surge accumulator air charging valve is referred to as the air charging valve.
(2)
In subsequent steps the hydraulic pressure surge accumulator is referred to as the surge accumulator.
B.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydrualic Supply System
(4)
AMM 32-00-30/201, Landing Gear Door Locks
(5)
AIPC 32-41-32 Fig. 1
C.
Access
(1)
Location Zones 138 Body Landing Gear Well, RH (Body Gear Hydraulic Pressure Surge Accumulator) 571 Rear Spar to Landing Gear Support Beam, LH (Left Wing Gear Hydraulic Pressure Surge Accumulator)
671 Rear Spar to Landing Gear Support Beam, RH (Right Wing Gear Hydraulic Pressure Surge Accumulator)
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32-41-23
ALL ú ú 01 Page 401 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
D. Prepare for the Removal
S 494-002
(1) Make sure the landing gear ground locks are installed
(AMM 09-11-00/201).
S 494-003
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 494-021
(3)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
S 944-004
(4)
Make sure the wheel chocks are installed at all wheels.
S 864-022
(5)
Supply electrical power (AMM 24-22-00/201).
S 864-005
(6)
Release the parking brake.
S 864-006
(7)
Make sure the pressure is removed from hydraulic system No. 4 (AMM 29-11-00/201).
S 684-007
(8)
Do these steps to remove the hydraulic fluid from the brake accumulator:
(a)
Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1.
(b)
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Do this cycle again 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS
gage decreases during the manual brake operation.
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