(9)  
Set the parking brake.

 (10)
 Remove the power from hydraulic system No. 4 (AMM 29-11-00/201).

 S 864-013
 S 864-014
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747-400 MAINTENANCE MANUAL
 ANTISKID SHUTTLE VALVE ASSEMBLY - MAINTENANCE PRACTICES
_______________________________________________________
 1.  General
_______
 A.  This procedure contains 2 tasks. The first task removes the shuttle valve or filter. The second task installs the shuttle valve or filter.
 TASK 32-42-14-002-001
 2.  Antiskid Shuttle Valve and/or Filter - 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
 S 492-002
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK(S) 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).
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747-400 MAINTENANCE MANUAL
 S 492-050
 (2)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 492-004

 (3)  
Make sure that chocks are installed at all wheels.

 S 842-005

 (4)  
Remove the pressure from hydraulic systems No. 1, 2, and 4 and the reservoirs (AMM 29-11-00/201).

 S 862-006

 (5)  
Release the parking brake.

 S 862-007

 (6)
Release hydraulic fluid from the brake accumulator as follows:

 (a)  
Push on the brake pedals fully 10 times.

 (b)  
Make sure the measurement on the HYD BRAKE PRESS gage, on the captain's instrument panel, P1, does not decrease since the brake pedals were last operated.

 D.
Remove the Antiskid Shuttle Valve (Fig. 201)

 S 032-017
 CAUTION: BE CAREFUL TO KEEP CONTAMINATON OUT OF THE SHUTTLE VALVE
_______ ASSEMBLY. CONTAMINATION CAN CAUSE A MALFUNCTION OF THE ANTISKID SHUTTLE VALVE.
 (1)  
Turn the valve cap counterclockwise and pull the valve from the shuttle valve assembly.

 S 492-018

 (2)  
Put a plug in the hole in the shuttle valve assembly.

 S 032-019

 (3)  
Remove the retainers and O-rings from the valve.

 S 032-020

 (4)  
Discard the O-rings.

 E.
Remove the Filter (Fig. 201)

 S 032-021
 CAUTION: BE CAREFUL TO KEEP CONTAMINATON OUT OF THE SHUTTLE VALVE
_______ ASSEMBLY. CONTAMINATION CAN CAUSE A MALFUNCTION OF THE ANTISKID SHUTTLE VALVE.
 (1)  Turn the cap counterclockwise and pull the filter from the shuttle valve assembly.
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