(2)
The installation of the accumulator isolation valve.
B.
The accumulator isolation valve is installed on the center web of the keel beam in the wheel well for the right body gear.
TASK 32-41-08-004-001
2. Accumulator Isolation Valve Removal (Fig. 401)___________________________________
A. References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply system
(4)
AMM 32-00-30/201, Landing Gear Door Locks
(5)
AIPC 32-41-08 Fig. 5
B.
Access
(1)
Location Zone
138 Body Landing Gear Well - Right
C.
Prepare for the Removal
S 864-035
(1)
Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
S 844-033
(2)
Make sure the wheel chocks are installed.
S 844-034
(3)
If necessary, release the parking brake.
S 494-027
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.
(4)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 494-028
(5)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
ACCUMULATOR ISOLATION VALVE INSTALLATION
SEE A
FWD
KEEL BEAM
ACCUMULATOR ISOLATION VALVE BSEE
ACCUMULATOR ISOLATION VALVE INSTALLATIONA
Accumulator Isolation Valve Installation Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
UNION PLUG
O-RING UNION
O-RING
BOLT (3 LOCATIONS)
WASHER (3 LOCATIONS)
O-RING
UNION
UNION
O-RING
ACCUMULATOR ISOLATION VALVE
B
Accumulator Isolation Valve Installation
Figure 401 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 844-036
(6)
Supply electrical power (AMM 24-22-00/201).
S 864-006
(7)
Remove the pressure from hydraulic systems 1, 2, and 4 (AMM 29-11-00/201).
S 864-007
(8)
Do these steps to remove the hydraulic fluid from the hydraulic 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. Repeat this cycle 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS
gage decreases during manual brake operation.
2) After the 10 cycles of manual brake operation, make sure the HYD BRAKE PRESS gage shows no more decrease in pressure.
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