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757 MAINTENANCE MANUAL
 (e)  
Set the STBY POWER switch to OFF.

 (f)  
Push the BAT switch on the P5 panel to off position.

 E. Put the Airplane Back to Its Usual Condition
 S 862-042
 (1)  Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).
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757 MAINTENANCE MANUAL
 CONTROL - ADJUSTMENT/TEST
_________________________
 1.  General_______
 A.  This procedure has three tasks. The first task does an operational test of the AC power system. The second task does a system test of the AC power system. The third task does a BITE/PERIODIC test of the BPCU.
 (1)  
The operational test does a fast system check. It uses the EICAS displays to monitor the system. No tools are necessary.

 (2)  
The system test gives more full checks of parts of the system.

 B.  It is necessary to operate the engines in the operational test, and the system test.
 TASK 24-22-00-715-001
 2.  Operational Test - AC Power System__________________________________
 A.  General
 (1)  The operational test does these tests:
 (a)  
BPCU BITE/PERIODIC TEST.

 (b)  
Engine Start with External Power, and Switch Check

 (c)  
Field Control Relay, for the L (R) IDG

 (d)  
Bus Tie Breakers, and Generator Circuit Breakers

 (e)  
Engine Shutdown.

 (f)  
Switch check with External Power and APU Power

 (g)  
Field Control Relay, for the APU Generator.

 (h)  
Engine Start with APU Power and Switch Check

 (i)  
Engine Shutdown with APU Generator

 B.  References
 (1)  
24-22-00/201, Electrical Power - Control

 (2)  
49-11-00/501, Auxiliary Power Unit (APU)

 (3)  
71-00-00/501, Power Plant

 C.  Access
 (1)  
Location Zones
 212 Flight Compartment (RH Side)
 119 Main Equipment Center

 (2)  
Access Panels
 119BL Main Equipment Center Panel

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MAINTENANCE MANUAL

MAIN EQUIP CTR

BUS POWER CONTROL UNIT, M116

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Component Location
Figure 501

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 D.  Prepare for the Test
 S 865-063
 (1)  Set the BAT switch to the ON position.
 E.  BPCU BITE/PERIODIC TEST
 S 745-060
 (1) Do the task BPCU BITE/PERIODIC TEST at the end of this procedure.
 NOTE:____Use battery power to supply power to the BPCU. Do not use the IDGs, External Power or APU generator to supply power to the BPCU when you do the test.
 S 865-064
 (2)  Set the BAT switch to the OFF position.
 F.  Engine Start with External Power, and Switch Check
 S 865-005
 (1)  
Supply external power to the main ac buses (Ref 24-22-00).

 S 715-006

 (2)  
Do a check of the EICAS displays:
　
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