(a)  
P6, Main Power Distribution Panel
 1) 6B24, AC 3 STBY PWR

 S 865-161
 (2)  
Make sure that data shows on the upper EICAS screen.

 S 865-153

 (3)  
Set the STANDBY POWER switch to BAT.

 S 715-155

 (4)  
Make sure that data shows on the upper EICAS screen.

 S 715-141

 (5)  
Make sure data shows on the captain's primary flight display (PFD), the navigation display (ND) and the left flight management computer (FMC).

 S 715-167

 (6)  
Make sure the advisory EICAS messages >BAT DISCH MAIN and >BAT DISCH APU show on the upper EICAS screen. If numerous EICAS messages appear, refer to Fault Isolation Manual 24-CMCS Message Index corrective action for CMCS messages 24171 or 24174 for troubleshooting procedures.

 NOTE: The EICAS messages >BAT DISCH MAIN and >BAT DISCH APU can
____ take up to 3 minutes to show. It is possible that you must turn on the passenger address system. This will make a sufficient current load to give the EICAS indications.
 S 865-169
 (7)  Set the STANDBY POWER switch to AUTO.
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 S 715-121
 (8)  Make sure that the Electrical Maintenance Page shows that the battery charge current is more than 30 Amps.
 NOTE: If the battery charge current does not exceed 30 Amps,
____ replace the battery charger (AMM 24-31-02/401) and repeat steps 3 to 7.
 S 865-175
 (9)  
Close this circuit breaker:

 (a)  
P6, Main Power Distibution Panel
 1) 6B24, AC 3 STBY PWR

 S 715-171
 (10)
 Make sure the advisory EICAS messages >BAT DISCH MAIN and >BAT DISCH APU do not show.

 S 865-179

 (11)
 Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 TASK 24-29-00-715-001
 3. Operational Test - 115-Volt AC Standby Power Generation (Fig. 501)
_______________________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
WDM 24-33-21, WDM 24-33-31

 (3)  
SSM 24-33-02, SSM 24-33-03

 B. Access
 (1)  Location Zone
 221 Control Cabin, LH

 C. Prepare for the Test
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 S 865-002
 (1)  Supply external electrical power (AMM 24-22-00/201).
 NOTE: If you supply one external power source only, it is possible
____ that the SSB will open during the test. If the SSB opens, find the the SPLIT SYSTEM BREAKER switch on the GEN FIELD MAN RESET module (P461 panel). Move the switch up, then down. This will close the SSB.
 S 715-076
 (2)  
Do a check of the indicator lights for the electrical system.

 (a)  
Set the IND LTS switch, on the P5 panel, to TEST.

 (b)  
Make sure all the indicator lights for the electrical system on the P5 panel and the P461 panel come on.

 (c)  
Set the IND LTS switch to BRT.

 S 865-006
 (3)  
Make sure the ISLN lights on the four BUS TIE switches, on the P5 panel, are off.

 (a)  
If an ILSN light on a BUS TIE 1, 2, 3, or 4 switch is on, push the switch to cause the light to go off.

 S 865-181
 CAUTION:_______DO NOT REMOVE UTILITY POWER. THE ELECTRONICS IN THE E/E RACK AND THE FLIGHT COMPARTMENT CAN BECOME TOO HOT.
 (4)  Remove the electrical loads that are not necessary on the airplane (i.e.: galleys, heat).
 NOTE: Smaller loads on the AC buses will decrease the wear on
　
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