(4)  
Lubricate the O-rings and the backup rings of the pressure switch and install them on the pressure switch.

 (5)  
Install the pressure switch on the shuttle valve.

 S 432-078
 S 432-080
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747-400 MAINTENANCE MANUAL
 S 432-081
 (6)  
Install a lockwire to safety the pressure switch to the shuttle valve.

 S 122-082

 (7)  
Prepare the applicable surface of the shuttle valve for an electrical bond with the related surface of the support bracket (SWPM 20-20-00).

 S 122-083

 (8)  
Prepare the applicable surface of the support bracket for an electrical bond with the related surface of the shuttle valve (SWPM 20-20-00).

 S 422-084

 (9)  
Do these steps to install the shuttle valve:

 (a)  
Put the shuttle valve in its installed position on the airplane.

 (b)  
Install the four sets of bolts, nuts and washers that attach the shuttle valve to the support bracket.

 (c)  
If it is necessary, remove the cap on the receptacle of the pressure switch.

 (d)  
Remove the cap from the plug of the wire bundle.

 (e)  
Connect the applicable electrical connector:

 DS280 - to connect the right shuttle valve DS281 - to connect the left shuttle valve.

 (f)  
Do a check of the electrical resistance between the shuttle valve and the support bracket as follows: 1) The resistance between the shuttle valve and the support

 bracket must be 0.0025 ohm or less.

 (g)  
Remove the caps or plugs that are on the ends of the open hydraulic lines.

 (h)  
Connect the three hydraulic lines to the shuttle valve.

 S 862-085
 (10)
 Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  
P180 DC Power Distribution Panel
 1) 180J25 AUTOBRAKE

 S 712-086
 (11) Do the "Operational Test - Autobrake Shuttle Valve" task to do a test of the applicable autobrake shuttle valve.
 TASK 32-42-12-002-087
 4.  Brake Metered Pressure Switch - Removal (Fig. 201)_______________________________________
 A. References
 (1)  AMM 09-11-00/201, Towing
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747-400
MAINTENANCE MANUAL

 (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)  
IPC 32-42-12-01

 (6)  
SSM 32-41-01

 (7)  
WDM 32-41-31

 B.
Access

 (1)  
Location Zones
 118 Electrical & Electronics Compartment, RH
 (P180 DC Power Distribution Panel)
 135 Wing Landing Gear Well - Left
 (Aft Bulkhead, Wing Gear Wheel Well)

 136  Wing Landing Gear Well - Right (Aft Bulkhead, Wing Gear Wheel Well)
 C. Prepare for the Removal
 S 492-147
 (1)  
Make sure the ground locks are installed in all landing gear (AMM 09-11-00/201).

 S 492-148

 (2)  
Make sure the wheel chocks are installed.

 S 842-090

 (3)  
If it is necessary, release the parking brake.

 S 492-091
 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).
　
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