S 092-049
(2)
Do this task: "Removal of the Door Locks from 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
ANTISKID SHUTTLE VALVE ASSEMBLY - REMOVAL/INSTALLATION
______________________________________________________
1. General
_______
A. This procedure contains the removal and the installation task for the antiskid shuttle valve module.
B. There are four antiskid shuttle valve modules, one for each main landing gear.
(1)
The antiskid shuttle valve modules for the wing gear are installed on the bottom of the wing trailing edge, above the wing gear trunnion.
(2)
The antiskid shuttle valve modules for the body gear are installed on the aft bulkhead of the body gear wheel well, above the body gear trunnion.
C.
The antiskid shuttle valve modules for the wing gear are similar to those for the body gear, except that the body gear modules have pressure compensated flow regulators on the brake ports. The wing gear modules have unions on the brake ports. The pressure compensated flow regulators for the wing gear are installed on the shock strut above the truck.
TASK 32-42-14-014-001
2. Antiskid Shuttle Valve Module Assembly - Removal
________________________________________________
A. References
(1)
AMM 29-11-00/201, Main Hydraulic Supply System
(2)
AMM 32-00-30/201, Landing Gear Door Locks
(3)
AIPC 32-42-07-05
B.
Access
(1)
Location Zones
137 Body Landing Gear Well - Left (Aft Bulkhead, Body Gear Wheel Well) Antiskid Shuttle Valve Assembly - Left Body Gear
138 Body Landing Gear Well - Right (Aft Bulkhead, Body Gear Wheel Well) Antiskid Shuttle Valve Assembly - Right Body Gear
571 Rear Spar to Landing Gear Support Beam, LH (above the wing gear trunion) Antiskid Shuttle Valve Assembly - Left Wing Gear
671 Rear Spar to Landing Gear Support Beam, RH (above the wing gear trunion) Antiskid Shuttle Valve Assembly - Right Wing Gear
C. Prepare for the Removal
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 494-002
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.
(1)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 494-035
(2)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
S 494-004
(3)
Make sure the chocks are installed at all the wheels.
S 864-036
(4)
Remove the pressure from hydraulic systems No. 1, 2, and 4 and the reservoirs (AMM 29-11-00/201).
S 844-037
(5)
Release the parking brake.
S 864-007
(6)
Release the hydraulic fluid from the brake accumulator with these steps:
(a)
Operate the brake pedals fully 10 times.
(b)
Look at the HYD BRAKE PRESS gage on the captain's instrument panel, P1, and make sure it does not show a decrease in brake pressure on the last time the brake pedals are operated.
D.
Remove the Antiskid Shuttle Valve Module Assembly (Fig. 401)
S 034-013
CAUTION: BE CAREFUL TO KEEP CONTAMINATON OUT OF THE ANTISKID SHUTTLE
_______ VALVE MODULE. CONTAMINATION CAN CAUSE A MALFUNCTION OF THE ANTISKID SHUTTLE VALVE.
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