(c)  
Remove the disable relay.

 TASK 24-31-08-404-007
 3.  APU Battery Charger Disable Relay Installation (Fig. 401)______________________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 24-31-07 Fig. 2

 (3)  
WDM 24-31-21

 (4)  
SSM 24-31-02

 B.
Access

 (1)  
Location Zone
 271 Passenger Cabin, LH

 (2)  
Access Panel
 P183 E-33 Equipment Center Panel

 C.
Install the APU Battery Charger Disable Relay

 S 424-008
 (1)  
Install the disable relay:

 (a)  
Install the three screws that attach the relay to the P183 panel.

 (b)  
Tighten the screws.

 (c)  
Install the screws that attach the P183 panel to the E-33 equipment rack.

 S 864-024
 (2)  
Connect the electrical connector to the APU battery:

 (a)  
Put the APU battery connector (DM7432A) into the receptacle on the APU battery.

 (3)  
Remove the DO-NOT-OPERATE tag from the BATTERY switch.

 S 864-011
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A
747-400 MAINTENANCE MANUAL
 D. Do a Test of the APU Battery Charger Disable Relay
 S 864-016
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 714-015

 (2)  
Do a test of the disable relay:

 (a)  
Set the STANDBY POWER switch, on the P5 panel, to BAT.

 (b)  
Make sure the advisory EICAS message >BAT DISCH APU shows on the main EICAS display.

 (c)  
Set the STANDBY POWER switch to AUTO.

 S 864-025
 (3) Remove electrical power, if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 APU BATTERY BUS TRANSFER RELAY - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the transfer relay for the APU battery bus (R7687). The other task is the installation of the transfer relay.
 B.  The transfer relay is installed in the P180 DC power distribution panel. The P180 panel is between the nose gear wheel well and the fuselage, on the right side. Access to the P180 panel is through an access opening, forward of the E/E compartment.
 TASK 24-31-16-004-001
 2.  APU Battery Bus Transfer Relay Removal (Fig. 401)______________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
IPC 24-33-01 Fig. 1

 (3)  
WDM 24-33-11

 (4)  
SSM 24-33-01

 B.  
Access

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

 (2)  
Access Panel
 P180 DC Power Distribution Panel

 C.  
Procedure

 (1)
Make sure all electrical power is off (AMM 24-22-00/201).

 S 864-002

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

 S 034-019

 (3)  
Disconnect the electrical connectors from the batteries:

 (a)  
Turn the knob on the main battery connector (DM7423A) counterclockwise until the connector is free from the main battery receptacle.

 S 864-023
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