136  Wing Landing Gear Well- Right (Aft Bulkhead, Wing Gear Wheel Well)
 C.  Prepare for the Removal
 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 494-027

 (2)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 (3)
Make sure you installed chocks at all the wheel locations.

 S 864-033

 (4)  
Remove the pressure from hydraulic system No. 4 and the reservoir (AMM 29-11-00/201).

 S 494-003
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747-400 MAINTENANCE MANUAL
 S 844-034
 (5)  
Release the parking brake.

 S 864-006

 (6)  
Do these steps to release the hydraulic fluid from the brake accumulator:

 (a)  
Operate the brake pedals through their full travel range 10 times.

 (b)  
Examine the HYD BRAKE PRESS gage on the captain's instrument panel and do this check: 1) Make sure the indication did not decrease the last time you

 operated the brake pedals.
 S 864-007
 (7)  
Open this circuit breaker and attach a DO-NOT-OPERATE tag:

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

 D.
Remove the Autobrake Pressure Control Module (Fig. 401)

 S 034-008
 (1)  
Disconnect these components:

 (a)  
The electrical connectors, D439A, D439B, D439C, and D439D from the autobrake pressure control module 1) Put caps on the connectors and the receptacles.

 CAUTION: BE CAREFUL TO KEEP CONTAMINATION OUT OF THE AUTOBRAKE
_______ PRESSURE CONTROL MODULE. IT CAN CAUSE A MALFUNCTION OF THE MODULE.
 (b)  The hydraulic lines (3 locations) from the autobrake pressure control module. 1) Put a cap on the hydraulic lines you removed.
 S 024-012
 (2)  Hold the autobrake pressure control module and remove the bolts that connect it to the airplane (4 locations).
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MAINTENANCE MANUAL

AUTOBRAKE PRESSURE CONTROL MODULE
SEE A
HYDRAULIC LINE HYDRAULIC LINE
ADAPTER
ADAPTER
O-RING O-RING
BACKUP RING BACKUP RING O-RING O-RING
NUT (4 LOCATIONS)
CONNECTOR WASHER (4 LOCATIONS)
SUPPORT BRACKET
BOLT (4 LOCATIONS)
O-RING
BACKUP RING
O-RING
CONNECTOR

ADAPTER
HYDRAULIC LINE
AUTOBRAKE PRESSURE CONTROL MODULE
A
Autobrake Pressure Control Module Installation
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 024-028
 (3)  
Remove the module from the airplane.

 S 034-013

 (4)  
Remove all the adapters and discard all the O-rings.

 S 494-014

 (5)  
Put a plug in the open ports of the autobrake pressure control module.

 TASK 32-42-11-404-015
 3.  Autobrake Pressure Control Module - Installation________________________________________________
　
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