B.
Access

 (1)  
Location Zones

 137  Body Landing Gear Well - Left (Aft bulkhead, body gear wheel well) Normal Antiskid Module - Left Body Gear
 138  Body Landing Gear Well - Right (Aft bulkhead, body gear wheel well) Normal Antiskid Module - Right Body Gear
 571  Rear Spar to Landing Gear Support Beam, LH (Above the wing gear trunion) Normal Antiskid Module - Left Wing Gear
 671  Rear Spar to Landing Gear Support Beam, RH (Above the wing gear trunion) Normal Antiskid Module - Right Wing Gear
 C. Prepare for the Removal
 S 492-107
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASKS 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 492-211

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

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

 S 862-212

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

 (5)  
Release the parking brake.

 S 492-108
 S 842-213
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-111
 (6)  
Release hydraulic fluid from the brake accumulator with these steps:

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

 (b)  
Look at the HYD BRAKE PRESS gage on the captain's instrument panel, and make sure the pressure stays the same after the last time you press the brake pedals.

 D.
Remove the Inlet Filter (Normal Antiskid Module) (Fig. 205)

 S 032-112
 (1)  
Remove the four screws (1) and the filter cover (2) from the normal antiskid module.

 S 032-113

 (2)  
Remove the O-ring (9) and the retainers (8) from the cover, and discard the O-ring.

 S 022-114
 CAUTION: BE CAREFUL TO KEEP CONTAMINATION OUT OF THE PORTS OF THE
_______ ANTISKID MODULE. CONTAMINATION CAN CAUSE A MALFUNCTION OF THE NORMAL ANTISKID MODULE.
 (3)  
Pull the filter (3) from the alternate antiskid module.

 S 032-116

 (4)  
Remove the retainers (10) and the O-ring (11) from the filter, and discard the O-rings.

 (5)  
Install a plug in the hole in the module.

 S 492-117
 TASK 32-42-02-422-118
 11. Antiskid Module Inlet Filter (Normal Antiskid Module) - Installation
____________________________________________________________________
 A. Consumable Materials
 (1)  C00272 Hydraulic Fluid - BMS 3-11
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

WING GEAR NORMAL
ANTISKID MODULE

NORMAL
ANTISKID
MODULE

WING GEAR NORMAL ANTISKID MODULESEE A
1.
 SCREW

2.
 FILTER COVER

3.
 FILTER

HYDRAULIC LINE
8. RETAINER
5. SCREEN FILTER
9. O-RING
4. O-RING
8. RETAINER
10.
 RETAINER 10. RETAINER  7. REDUCER

11.
 O-RING  6. O-RING

ANTISKID MODULE
BRACKET
NORMAL ANTISKID MODULE
A
NOTE:BODY GEAR SHOWN, WING GEAR EQUIVALENT.
Normal Antiskid Module - Antiskid Module FilterFigure 205
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