32-42-12
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 BRAKE PEDAL BUS SWITCH - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the switch for the brake pedal bus. The second task installs the switch for the brake pedal bus.
 B.  No adjustments are necessary when you replace the switch because the adjustments are controlled by the attach holes that were drilled in the support beam when the first switch was installed.
 TASK 32-42-13-004-001
 2.  Switch for the Brake Pedal Bus - Removal________________________________________
 A.  References
 (1)  
AMM 25-22-01/401, Main Passanger Cabin Ceiling Access Panels

 (2)  
AIPC 32-41-02, Fig. 1

 (3)  
SSM 32-41-01

 (4)  
WDM 32-41-31

 B.  
Access

 (1)  
Location Zones 211 Passenger cabin - nose to first door, LH (Brake Pedal Bus Switch S1595)

 212  Passenger cabin - nose to first door, RH (Brake Pedal Bus Switch S1596)
 C.  Procedure (Fig. 401)
 S 864-002
 (1)  
Open this circuit breaker and install a DO-NOT-CLOSE tag:

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

 S 094-003
 (2)  
Remove the fourth center ceiling panels in the passenger compartment forward of the No. 1 entry door (AMM 25-22-01/401).

 (3)  
Disconnect the wires (2 locations) from the terminals on the switch.

 S 024-005

 (4)  
Remove the nuts, washers and bolts (3 locations) that attach the switch support bracket to the support beam, and remove the switch from the airplane.

 S 034-004
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 32-42-13
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SWITCH
ASSEMBLY

SEE A
BOLT (3 LOCATIONS)
WASHER (3 LOCATIONS)
WIRE
SCREW
SWITCH ASSEMBLY
WASHER (3 LOCATIONS)
NUT (3 LOCATIONS)
A
747-400 MAINTENANCE MANUAL
UPPER DECK FLOOR
NO. 1 ENTRY DOOR
STOP
LEVER ARM FOR THE BRAKE PEDAL BUS
SUPPORT BRACKET
SWITCH ASSEMBLY
A
Brake Pedal Bus Switch Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-42-13
 ALL  ú ú 01 Page 402 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 32-42-13-404-006
 3.  Switch for the Brake Pedal Bus - Installation_____________________________________________
 A. References
 (1)  
AMM 25-22-01/401, Main Passanger Cabin Ceiling Access Panels

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AIPC 32-41-02, Fig. 1

 (4)  
SSM 32-41-01

 (5)  
WDM 32-41-31

 B.
Access

 (1)  
Location Zones 211 Passenger cabin - nose to first door, LH (Brake Pedal Bus Switch S1595)

 212  Passenger cabin - nose to first door, RH (Brake Pedal Bus Switch S1596)
 C. Procedure (Fig. 401)
 S 424-007
 (1)  
Put the switch assembly in its position on the support beam and install three bolts, washers and nuts.

 (a)  
Install the bolts, the nuts and the washers (2 locations) on the aft flange of the switch support bracket but do not tighten them.

 (b)  
Turn the switch assembly until you can install the bolt through the forward flange of the switch support bracket and the mating hole in the support beam.

 (c)  
Tighten the bolts (3 locations).

 (2)
Connect the wires to the external terminals on the switch.

 S 864-009
　
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