(a)  
Make sure that the ON lights are off.

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747-400 MAINTENANCE MANUAL
 S 215-019
 (11)
 Make sure that the EICAS synoptic page shows:

 (a)
The generator circuit breakers 1, 2, 3, and 4 are closed.

 (b)
The auxiliary power breakers 1 and 2 are open.

 (c)
The bus tie breakers 1, 2, 3, and 4 are closed.

 (d)
The split system breaker is closed.

 S 715-020
 (12)
 Push the BUS TIE 1, 2, 3, and 4 switches to ISLN.

 S 215-021

 (13)
 Make sure that the ISLN lights on the BUS TIE 1, 2, 3, and 4 switches are on.

 S 215-056

 (14)
 Make sure that these EICAS messages show on the main EICAS screen:

 (a)
ELEC BUS 1 ISLN

 (b)
ELEC BUS 2 ISLN

 (c)
ELEC BUS 3 ISLN

 (d)
ELEC BUS 4 ISLN

 S 215-022
 (15)
 Make sure that the EICAS synoptic page shows:

 (a)
The generator circuit breakers 1, 2, 3, and 4 are closed.

 (b)
The bus tie breakers 1, 2, 3, and 4 are open.

 (c)
The split system breaker is closed.

 S 715-023
 (16)
 Set the BUS TIE 1, 2, 3, and 4 switches to AUTO.

 S 215-053

 (17)
 Make sure that the ISLN lights on the BUS TIE 1, 2, 3, and 4 switches go out.

 S 215-054

 (18)
 Make sure that these EICAS messages do not show on the main EICAS screen:

 (a)
ELEC BUS 1 ISLN

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747-400 MAINTENANCE MANUAL
 (b)
ELEC BUS 2 ISLN

 (c)
ELEC BUS 3 ISLN

 (d)
ELEC BUS 4 ISLN

 S 215-023
 (19)
 Make sure that the AVAIL lights on EXT PWR 1 and EXT PWR 2 are on.

 S 715-024

 (20)
 Push the EXT PWR 1 and EXT PWR 2 switches.

 S 215-064

 (21)
 Make sure that the ON lights on the EXT PWR 1 and EXT PWR 2 switches go on in 4 seconds.

 NOTE: The change from IDG power to external power must not
____ cause an interruption in the power service that you can see.
 S 215-025
 (22)
 Make sure that the OFF lights on GEN CONT 1, 2, 3, and 4 switches are on.

 S 215-055

 (23)
 Make sure that these EICAS messages show on the main EICAS screen:

 (a)
ELEC GEN OFF 1

 (b)
ELEC GEN OFF 2

 (c)
ELEC GEN OFF 3

 (d)
ELEC GEN OFF 4

 S 215-026
 (24)
 Make sure that the EICAS synoptic page shows:

 (a)
The external power contactors 1 and 2 are closed.

 (b)
The generator circuit breakers 1, 2, 3, and 4 are open.

 (c)
The bus tie breakers 1, 2, 3, and 4 are closed.

 (d)
The split system breaker is open.

 (25)
 Push the GEN CONT 1 and GEN CONT 4 two times to the ON position.

 S 715-027
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 215-028
 (26) Make sure that the OFF lights on GEN CONT 1, 2, 3, and 4 switches are off.
　
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