(e)  
Make sure the ON lights on the APU GEN 1 and 2 switches are on.

 (f)  
Make sure the AVAIL lights on the EXT PWR 1 and 2 switches, on the P5 panel, are on.

 (g)  
Push the ELEC switch on the EICAS display panel to get the synoptic page for the electrical system.

 (h)  
Look for these indications:
 1) The auxiliary power breakers 1 and 2 are closed.
 2) The external power contactors 1 and 2 are open.
 3) The bus tie breakers 1, 2, 3, and 4 are closed.
 4) The split system breaker is open.

 (i)  
Push the EXT PWR 1 and 2 switches to on.

 (j)  
Make sure the ON lights on the EXT PWR 1 and 2 switches, on the P5 panel, are on.

 (k)  
Make sure the AVAIL lights on the APU GEN 1 and 2 switches, on the P5 panel, are on.

 (l)  
Look for these indications:
 1) The auxiliary power breakers 1 and 2 are open.
 2) The external power contactors 1 and 2 are closed.
 3) The bus tie breakers 1, 2, 3, and 4 are closed.
 4) The split system breaker is open.

 (m)  
Stop the APU (49-11-00/201).

 S 714-031
 (4)  
If you replaced the generator control breaker (GCB), do a test of the GCB.

 (a)  
Start the applicable engine (Ref 71-00-00/201).

 (b)  
Make sure the OFF light on the applicable GEN CONT switch is off.

 (c)  
Make sure the applicable AVAIL light on the EXT PWR 1 or 2 switch, on the P5 panel, is on.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (d)  
Push the ELEC switch on the EICAS display panel to get the synoptic page for the electrical system.

 (e)  
Look for these indications: 1) The applicable generator circuit breaker 1, 2, 3 or 4 is

 closed. 2) The applicable external power contactor 1 or 2 is open. 3) The bus tie breakers 1, 2, 3, and 4 are closed. 4) The split system breaker is open.

 (f)  
Push the EXT PWR 1 or 2 switch that shows AVAIL to on.

 (g)  
Make sure the ON lights on the EXT PWR 1 and 2 switches, on the P5 panel, are on.

 (h)  
Make sure the OFF lights on the GEN CONT 1, 2, 3, and 4 switches, on the P5 panel, are on.

 (i)  
Look for these indications: 1) The generator circuit breakers 1, 2, 3, and 4 are open. 2) The external power contactors 1 and 2 are closed. 3) The bus tie breakers 1, 2, 3, and 4 are closed. 4) The split system breaker is open.

 (j)  
Stop the engine (71-00-00/201).