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A
747-400
MAINTENANCE MANUAL

SEE  A 
M7422 CHARGER, MAIN BATTERY  SEE  B  A EQUIPMENT RACK, E30 

ELECTRICAL
CONNECTOR

SEE C
LOCKWASHERS
NUTS

WASHER
WIRES

SCREW FWD
WASHERS
TERMINAL
BLOCK COVER

MAIN BATTERY CHARGER B
Main Battery Charger Installation Figure 401 (Sheet 1)
BATTERY
CHARGER

H43841
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A
747-400
MAINTENANCE MANUAL

C

Main Battery Charger Installation
Figure 401 (Sheet 2)

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H43844
A
747-400
MAINTENANCE MANUAL

 (2)  
24-22-00/201, Manual Control

 (3)  
45-10-00/201, Central Maintenance Computer System

 (4)  
AMM 45-10-00/201, Central Maintenance Computer System

 (5)  
IPC 24-31-02 Fig. 2

 (6)  
WDM 24-31-11

 (7)  
SSM 24-31-01

 B.  Access
 (1)  Location Zone
 116 Area Between Nose Gear Well and Fuselage, RH

 C.  Install the Main Battery Charger
 S 424-005
 (1)  
Install the main battery charger in the E-30 equipment rack
 (Ref 20-11-22/401).

 (a)
Tighten the main battery charger stud nuts as follows:

 NOTE: If you use the plain nut on the main battery charger
____ studs, you must use a plain washer and lock washer under the nut. If you use the self-locking nut, use only the plain washer under the nut.
 1)  Tighten the stainless steel self-locking nut on the + (positive) terminal of the battery charger to 190 +/- 10 inch-pounds.
 2)  Tighten the stainless steel plain nut on the + (positive) terminal of the battery charger to 185 +/- 10 inch-pounds.
 3)  Tighten the stainless steel self-locking nut on the -(negative) terminal of the battery charger to 140 +/- 5 inch-pounds.
 4)  Tighten the stainless steel plain nut on the - (negative) terminal of the battery charger to 135 +/- 5 inch-pounds.
 S 864-010
 (2)  
Remove the DO-NOT-OPERATE tag from the BATTERY switch.

 S 944-016

 (3)  
Remove the DO-NOT-CLOSE identifiers and close these circuit
 breakers:

 (a)  
P180 DC Power Distribution Panel
 1) MAIN BAT CHARGER OUTPUT

 (b)  
P414 Main Power Distribution Panel
 1) MAIN BATTERY CHARGER

 D.  Do a Test of the Main Battery Charger
 S 864-011
 (1)  
Supply external electrical power (Ref 24-22-00/201).

 S 714-012

 (2)  
Do a test of the main battery charger:

 (a)  
AIRPLANES WITH BATTERY CHARGER AND BATTERY LIGHTS;

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747-400 MAINTENANCE MANUAL
 Make sure the battery charger and battery lights are on.
 (b)  
Get access to the EXISTING FAULTS page for Chapter 24 (if any) on the CMCS (AMM 45-10-00/201).

 (c)  
Make sure the maintenance messages for the main battery charger do not show.

 (d)  
Get access to the maintenance page for the electrical system (AMM 45-10-00/201).
　
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