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A
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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