24-31-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
MAIN BATTERY CHARGER DISABLE RELAY - REMOVAL/INSTALLATION
_________________________________________________________
1. General_______
A. This procedure has two tasks. One task is the removal of the disable relay (R7208) for the main battery charger. The other task is the installation of the disable relay.
B. The installation task includes an operational test of the disable relay.
C. The disable relay is installed in the power distribution center (P414 panel). The power distribution center is in the E/E compartment. Access to the E/E compartment is through the door behind the nose wheel or through the forward cargo compartment.
TASK 24-31-04-004-001
2. Main Battery Charger Disable Relay Removal (Fig. 401)__________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
IPC 24-31-04 Fig. 1
(3)
WDM 24-31-11
(4)
SSM 24-31-01
B.
Access
(1)
Location Zone 117 Electrical and Electronics Compartment, LH
(2)
Access Panel
P414 Power Distribution Center - Left
C.
Procedure
(1)
Make sure all electrical power is off (Ref 24-22-00/201).
S 864-021
(2)
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.
(3)
Open the access door on the P414 panel.
S 024-019
(4)
Remove the disable relay:
(a)
Remove the three screws that attach the relay to the panel.
S 864-002
S 014-004
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24-31-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SCREW (3 PLACES) SEE A
SEE B
P414 POWER DISTRIBUTION CENTER - LEFT A
MAIN BATTERY CHARGER DISABLE RELAY (R7208)
B
Main Battery Charger Disable Relay Installation Figure 401
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747-400 MAINTENANCE MANUAL
(b) Remove the disable relay from the panel.
TASK 24-31-04-404-007
3. Main Battery Charger Disable Relay Installation (Fig. 401)_______________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
IPC 24-31-04 Fig. 1
(3)
WDM 24-31-11
(4)
SSM 24-31-01
B.
Access
(1)
Location Zone 117 Electrical and Electronics Compartment, LH
(2)
Access Panel
P414 Power Distribution Center - Left
C.
Install the Main Battery Charger Disable Relay
S 424-008
(1)
Install the disable relay:
(a)
Install the three screws that attach the relay to the P414 panel.
(b)
Tighten the screws.
S 414-010
(2)
Close the access door on the P414 panel.
S 864-022
(3)
Remove the DO-NOT-OPERATE tag from the BATTERY switch.
D.
Do a Test of the Main Battery Charger Disable Relay
(1)
Supply electrical power (Ref 24-22-00/201).
S 714-018
(2)
Do a test of the disable relay:
(a)
Set the STANDBY POWER switch, on the P5 overhead panel, to BAT.
(b)
Make sure the advisory EICAS message >BAT DISCH MAIN shows on the main EICAS display.
(c)
Set the STANDBY POWER switch to AUTO.
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