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747-400 MAINTENANCE MANUAL
 S 494-087
 (2)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 494-041

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

 S 844-042

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

 S 864-043

 (5)  
Release the parking brake.

 S 864-044

 (6)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P180, DC Power Distribution Panel
 1) 180J7, ANTI-SKID 1-3
 2) 180J8, ANTI-SKID 14-16
 3) 180F7, ANTI-SKID 2-4
 4) 180J23, ANTI-SKID 10-12
 5) 180J22, ANTI-SKID 5-7
 6) 180F23, ANTI-SKID 9-11
 7) 180F8, ANTI-SKID 13-15
 8) 180F22, ANTI-SKID 6-8

 E.
Remove the Alternate Antiskid Module Assembly (Fig. 402)

 S 034-045
 (1)  Remove the clamp and disconnect the wire bundle from the applicable antiskid valve at the connector shown:
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747-400
MAINTENANCE MANUAL

BULKHEAD 
(1480) 
BULKHEAD 
ALTERNATE (1240) 
ANTISKID 
MODULE  FWD 
SEE  A 
BULKHEAD 
(1350) 
BOLT 
HYDRAULIC LINE  WASHER 
REDUCER 
O-RING 
WASHER BOLT  REDUCER  HYDRAULIC LINE 
O-RING 
CONNECTOR 

LINE HYDRAULIC  BOLT WASHER  BRACKET SUPPORT 
O-RING 
UNION 
A ALTERNATE ANTISKID MODULE HYDRAULIC LINE 
Figure 402 Alternate Antiskid Module Installation 

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747-400 MAINTENANCE MANUAL
 CONNECTORS
__________ ~.............................................. | Left Wing Gear Alternate Antiskid Module | ................................................ | Valve No. A2 | Valve No. A1 | ................................................ | DV35 | DV129 | 2......................….......................1 ~.............................................. | Right Body Gear Alternate Antiskid Module | ................................................ | Valve No. A5 | Valve No. A6 | ................................................ | DV131 | DV38 | 2......................….......................1 ~.............................................. | Left Body Gear Alternate Antiskid Module | ................................................ | Valve No. A3 | Valve No. A4 | ................................................ | DV130 | DV36 | 2......................….......................1 ~.............................................. | Right Wing Gear Alternate Antiskid Module | ................................................ | Valve No. A7 | Valve No. A8 | ................................................ | DV132 | DV37 | 2......................….......................1
 S 494-046
 (2)  
Put a cap on the open connectors.

 S 034-047

 (3)  
Disconnect the hydraulic lines (5 locations) on the alternate antiskid module assembly.

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