(2)  
AIPC 24-33-01, Fig. 61

 (3)  
WDM 24-33-21

 (4)  
SSM 24-33-02

 B.  
Access

 (1)  
Location Zone
 222 Control Cabin, RH

 (2)  
Access Panel
 P6 Main Power Distibution Panel

 C.  
Procedure

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

 S 864-002

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

 S 864-024

 (3)  
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.

 S 864-003
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A
SCREW (4 PLACES)
SEE B
P6 MAIN POWER DISTRIBUTION PANEL
A
STANDBY POWER TRANSFER RELAY (R7227)
ELECTRICAL CONNECTOR RECEPTACLE
B
Standby Power Transfer Relay Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-004
 (4)
Open the access doors for the P6 panel.

 S 034-005

 (5)
Disconnect the electrical connector (DR7227) from the relay.

 S 034-006

 (6)
Remove the four screws that attach the relay to the P6 panel.

 S 024-007

 (7)
Remove the relay from the panel.

 TASK 24-29-03-404-008
 3.  Standby Power Transfer Relay Installation (Fig. 401)_________________________________________
 A. References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AIPC 24-33-01, Fig. 61

 (3)
WDM 24-33-21

 (4)
SSM 24-33-02

 B.
Access

 (1)  
Location Zone
 222 Control Cabin, RH

 (2)  
Access Panel
 P6, Main Power Distribution Panel

 C.
Install the Standby Power Transfer Relay

 S 424-025
 (1)
Install the relay.

 (a)
Put the relay in its position on the P6 panel.

 (b)
Install the four screws that attach the relay to the P6 panel.

 (c)
Tighten the screws.

 (2)
Connect the electrical connector (DR7227) to the relay.

 S 434-011
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 414-012
 (3)  
Close the access doors for the P6 panel.

 S 864-014

 (4)  
Remove the DO-NOT-OPERATE tags from the STANDBY POWER switch and the BATTERY switch.

 D.  Do a Test of the Standby Power Transfer Relay
 S 864-015
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 714-026

 (2)  
Do a test of the relay:

 (a)  
Open these circuit breakers:

 1)  P6, Main Power Distribution Panel a) 6K2, MN BAT-CONT INVERTER PWR b) 6K5, TRU-CONT INVERTER PWR

 (b)  
Make sure the main EICAS screen operates correctly.

 (c)  
Set the STANDBY POWER switch to OFF.

 (d)  
Make sure the main EICAS screen does not operate.

 (e)  
Close these circuit breakers:

 1)  P6, Main Power Distribution Panel a) 6K2, MN BAT-CONT INVERTER PWR b) 6K5, TRU-CONT INVERTER PWR
　
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