S 864-016
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747-400 MAINTENANCE MANUAL
S 864-020
(3) Remove electrical power if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
APU BATTERY - REMOVAL/INSTALLATION
__________________________________
1. General_______
A. This procedure has two tasks. One task is the removal of the APU battery (M7432). The other task is the installation of the APU battery.
B. The APU battery is installed on the E-33 equipment rack with the APU battery charger. 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 24-31-06-004-001
2. APU Battery Removal (Fig. 401)___________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
IPC 24-31-06 Fig. 1
(3)
WDM 24-31-21
(4)
SSM 24-31-02
B.
Access
(1)
Location Zone
271 Passenger Cabin, LH
C.
Procedure
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CAUTION: THE APU BATTERY MAY BE REMOVED WHILE THE AIRPLANE IS SUPPLIED
_______ WITH EXTERNAL POWER. EXTERNAL POWER PROVIDES PROTECTION FOR THE AC BUSES DURING APU BATTERY REMOVAL. DO NOT REMOVE THE APU BATTERY IF THE AIRPLANE IS SUPPLIED WITH IDG OR APU GENERATOR POWER. THE AC BUSES ARE NOT PROTECTED DURING APU BATTERY REMOVAL IF THE IDG OR APU GENERATOR SUPPLIES POWER, AND DAMAGE TO THE AIRPLANE COULD OCCUR.
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
On the P183 panel:
1) APU BAT CHGR
2) APU BATTERY BUS
(b)
On the P6 panel:
1) 6J9, APU BAT BUS APU BAT-CONT
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(2)
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.
S 034-020
(3)
Disconnect the electrical connectors from the APU battery.
(a)
Turn the knob on the APU battery connector (DM7432A) counterclockwise until the connector is free from the APU battery receptacle.
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747-400
MAINTENANCE MANUAL
SEE A
CSEE APU BATTERY GROUND DM7432A CONNECTOR, APU BATTERY APU BATTERY, M7432
SEE B (6 LOCATIONS) SCREW
A E33 EQUIPMENT RACK DM7432B CONNECTOR, ELECTRICAL B
LOCK NUT
WASHER LUG WIRE
WASHER BRACKET
SCREW GROUND BUILDUP
C
Figure 401 APU Battery Installation
G88497
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747-400 MAINTENANCE MANUAL
(b) Disconnect the electrical connector (DM7432B) from the APU battery receptacle.
S 024-021
(4)
Remove the APU battery.
(a)
Loosen the lock-screws on the APU battery tray.
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