S 865-004
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A
747-400 MAINTENANCE MANUAL
 APU BATTERY CHARGER - REMOVAL/INSTALLATION
__________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task removes the APU battery charger (M7431). The other task installs the APU battery charger.
 B.  The installation task includes an operational test of the APU battery charger.
 C.  The APU battery charger is installed on the E-33 equipment rack with the APU battery. The E-33 equipment rack is on the left side of the aft passenger cabin. Access to the E-33 equipment rack is through the E-33 access door.
 TASK 24-31-07-004-001
 2.  APU Battery Charger Removal (Fig. 401)___________________________
 A.  References
 (1)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
24-22-00/201, Manual Control

 (3)  
IPC 24-31-07 Fig. 2

 (4)  
WDM 24-31-21

 (5)  
SSM 24-31-02

 B.  
Access

 (1)  
Location Zone
 271 Passenger Cabin, LH

 C.  
Procedure

 S 864-014
 (1)
Open these circuit breakers and attach DO-NOT-CLOSE identifiers:

 (a)  
P183 Relay Panel
 1) APU BATTERY CHGR OUTPUT
 2) APU BATTERY CHARGER

 S 864-010
 (2)  
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.

 S 024-003

 (3)  
Remove the APU battery charger from the E-33 equipment rack (Ref 20-11-22/401).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE  A  SEE  B 
CHARGER, M7431 APU BATTERY  GROUND BATTERY APU CHARGER SEE C 
A E33 EQUIPMENT RACK  APU BATTERY CHARGER, M7431 

ELECTRICAL
CONNECTOR

SEE D
LOCKWASHERS
NUTS

WASHER
WIRES

SCREW
WASHERS

FWD TERMINAL
BLOCK COVER APU BATTERY CHARGER B
APU Battery Charger Installation Figure 401 (Sheet 1)
G88500
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-31-07
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

LOCK NUT
LUG WIREWASHER
WASHER BRACKET
SCREW
GROUND BUILDUP
C
CHARGER BATTERY CHARGER/CONTROLLER
INPUT: 115V 3PHASE 400HZ OUTPUT: 28V DC NOMINAL BOEING P/N: S282T003-2 MOD: SERIAL NO: ELDEC P/N: 08748/8-930-01 DATE OF MFG:
ELDEC CORPORATION LYNWOOD, WASHINGTON
D

APU Battery Charger Installation
Figure 401 (Sheet 2)

H87156
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A
747-400 MAINTENANCE MANUAL
 TASK 24-31-07-404-004
 3.  APU Battery Charger Installation (Fig. 401)________________________________
 A.  Special Tools and Equipment
 (1)  T477W Bonding Meter
 B.  References
 (1)  
20-11-22/401 Rack-Mounted Electrical/Electronic Module
　
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