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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (13)
 The APU standby power system supplies 115-volt ac single phase 400-Hz power to the captain's primary flight and navigation displays and to the left flight management computer.

 (14)
 With the standby power switch in the auto position and the main battery switch on, the captain's transfer bus normally supplies this voltage.

 (15)
 If power is lost on the captain's transfer bus, the system automatically switches these loads to the output of the APU static inverter.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
AC GENERATION
COMPONENT  FIG. 102 SHT  QTY ACCESS/AREA  REFERENCE 
CAP - LIGHTNING PROTECTOR 1 - A, X435  1  1  117AL, MAIN EQUIP CTR, P514  24-21-04 
CAP - LIGHTNING PROTECTOR 1 - B, X436  1  1  117AL, MAIN EQUIP CTR, P514  24-21-04 
CAP - LIGHTNING PROTECTOR 1 - C, X437  1  1  117AL, MAIN EQUIP CTR, P514  24-21-04 
CAP - LIGHTNING PROTECTOR 2 - A, X441  1  1  117AL, MAIN EQUIP CTR, P614  24-21-04 
CAP - LIGHTNING PROTECTOR 2 - B, X442  1  1  117AL, MAIN EQUIP CTR, P614  24-21-04 
CAP - LIGHTNING PROTECTOR 2 - C, X443  1  1  117AL, MAIN EQUIP CTR, P614  24-21-04 
CAP - LIGHTNING PROTECTOR 3 - A, X444  1  1  117AL, MAIN EQUIP CTR, P515  24-21-04 
CAP - LIGHTNING PROTECTOR 3 - B, X445  1  1  117AL, MAIN EQUIP CTR, P515  24-21-04 
CAP - LIGHTNING PROTECTOR 3 - C, X446  1  1  117AL, MAIN EQUIP CTR, P515  24-21-04 
CAP - LIGHTNING PROTECTOR 4 - A, X438  1  1  117AL, MAIN EQUIP CTR, P615  24-21-04 
CAP - LIGHTNING PROTECTOR 4 - B, X439  1  1  117AL, MAIN EQUIP CTR, P615  24-21-04 
CAP - LIGHTNING PROTECTOR 4 - C, X440  1 1  117AL, MAIN EQUIP CTR, P615  24-21-04 
CIRCUIT BREAKERS  1  FLT COMPT, P6 
AC STBY PWR APU BAT CONT, C10414  1  6J6  * 
APU AC STBY BUS VOLTAGE, C10367  1  6J4  *
 APU INV XFR RLY PWR CONT, C10413 1  6J5  *
 APU STBY ALT PWR, C10680 1  6B26  *
 APU STBY XFR RELAY, C10415 1  6A8  * 
CIRCUIT BREAKER  1  117AL, MAIN EQUIP CTR, P92 
SPLIT SYSTEM BREAKER, C961 1  24-22-02
CIRCUIT BREAKERS 1  117AL, MAIN EQUIP CTR, P180 
AGCU 1, C10059 1  180L1  *
 AGCU 2, C10060 1  180M1  *
 GCU 1, C479 1  180M4  *
 GCU 2, C480 1  180M5  *
 GCU 3, C481 1  180M6  *
 GCU 4, C482 1  180M7  *
 UTIL BUS 1 CONT, C10038 1  180J14  *
 UTIL BUS 2 CONT, C10039 1  180F14  *
 UTIL BUS 3 CONT, C10040 1  180J29  *
 UTIL BUS 4 CONT, C10041  1  180F29  *
CIRCUIT BREAKERS 1  117AL, MAIN EQUIP CTR, P414,P415 
AUX PWR 1 SYNC BUS, C10421  1  414M26  *
 AUX PWR 2 SYNC BUS, C10422  1  415M13  *
CIRCUIT BREAKERS 1  117AL, MAIN EQUIP CTR P514,P515, 
P614,P615 
AC 1 DIST - P414,C926 1  *
 AC 2 DIST A - P414,C925 1  * 
AC 2 DIST - P85 & P183,C3113 1  *
 AC 2 DIST B - P414,C1557 1  *
 AC 3 DIST - P414-P415,C928 1  *
 AC 4 DIST A - P415,C1558 1  *
 AC 4 DIST B - P415,C929 1  *
 BUS TIE BREAKER 1, C957 1  24-22-02
 BUS TIE BREAKER 2, C958 1  24-22-02 
BUS TIE BREAKER 3, C959 1  24-22-02 
BUS TIE BREAKER 4, C960 1  24-22-02 
GEN CIRCUIT BREAKER 1, C951 1  24-22-02 
　
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