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AC 2 DIST B - P414, C1557  1  * 
CIRCUIT BREAKER - AC 4 DIST A - P415, C1558  1  1  117AL, MAIN EQUIP CTR, P615  * 
CIRCUIT BREAKER - AC 4 DIST B - P415, C929  1  1  117AL, MAIN EQUIP CTR, P615  * 
CIRCUIT BREAKERS - 1  117AL, MAIN EQUIP CTR, P714  * 
APU GND SVCE BUS, C937  1  * 
APU GND SVCE BUS UTILITY, C3116  1  * 
EXT PWR GND SVCE BUS, C935  1  * 
EXT PWR GND SVCE BUS UTILITY, C3117  1  * 
GND HDLG BUS DIST - P414, C941  1  * 
GND HDLG BUS DIST - P59, C915  1  * 
GND HDLG BUS DIST - P86, C914  1  * 
GND SVCE BUS DIST P6, C936  1  * 

* SEE WDM EQUIPMENT LIST
AC Electrical Load Distribution - Component Index
Figure 101 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 FAULT ISOLATION/MAINT MANUAL
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
CIRCUIT BREAKERS - 3  117AL, MAIN EQUIP CTR, P715 
CARGO LOADS & LTG SEC 2, C1611  1 
P116 MAIN DECK CARGO HNDLG BUS, C1567  1 
P118 & P136 MAIN DECK CGO HNDLG BUS, C1570  1 
P124 MAIN DECK CARGO HNDLG BUS, C1568 RELAY - (REF 31-01-06, FIG. 101)  1  * 
STBY POWER TRANSFER, R7227  1 
RELAYS - 2  117AL, MAIN EQUIP CTR, P714  24-51-01 
GND HNDLNG - 1, R117  1 
GND HNDLNG - 2, R118  1 
GND SVCE SEL, R14  1 
GND SVCE TRANSFER, R15  1 
GND SVCE BUS UTIL-SEL, R1168  1 
GND SVCE BUS UTIL-TRANSFER, R1169  1 
RELAYS - 117AL, MAIN EQUIP CTR, P715  24-51-04 
MAIN DECK CARGO HANDLING BUS 1, R991  3  1 
AC 2 DIST-UTIL CURRENT, T4667 AC 3 DIST-UTIL, CURRENT, T4668 TRANSFORMERS - (REF 31-01-39, FIG. 101) AC 4 DIST-UTIL, CURRENT, T4669 AC 1 DIST-UTIL CURRENT, T4666 TRANSFORMERS - (REF 31-01-36, FIG. 101) MAIN DECK CARGO HANDLING BUS 2, R992  3  1 
TRANSFORMER - 28V AC GSB, T150  1  1  117AL, MAIN EQUIP CTR, P414  24-53-01 
TRANSFORMER - 28V AC MAIN, T94  1  1  FLT COMPT, P6  24-53-01 
UNIT - GALLEY POWER 1, ELEC LOAD CONT, M481  2  1  117AL, MAIN EQUIP CTR, P514  24-51-06 
UNIT - GALLEY POWER 2, ELEC LOAD CONT, M482  2  1  117AL, MAIN EQUIP CTR, P614  24-51-06 
UNIT - GALLEY POWER 3, ELEC LOAD CONT, M485  2  1  117AL, MAIN EQUIP CTR, P515  24-51-06 
UNIT - GALLEY POWER 4, ELEC LOAD CONT, M486  2  1  117AL, MAIN EQUIP CTR, P615  24-51-06 
UNIT - INST BUS VOLTAGE SENSE, CAPT, M7507  1  1  FLT COMPT, P6  24-51-07 
UNIT - INST BUS VOLTAGE SENSE, F/O, M7508  1  1  FLT COMPT, P6  24-51-07 
UNIT - UTILITY POWER 1, ELEC LOAD CONT, M3250  2  1  117AL, MAIN EQUIP CTR, P514  24-51-05 
UNIT - UTILITY POWER 2, ELEC LOAD CONT, M3251  2  1  117AL, MAIN EQUIP CTR, P614  24-51-05 
UNIT - UTILITY POWER 3, ELEC LOAD CONT, M3252  2  1  117AL, MAIN EQUIP CTR, P515  24-51-05 
UNIT - UTILITY POWER 4, ELEC LOAD CONT, M3253  2  1  117AL, MAIN EQUIP CTR, P615  24-51-05 

* SEE WDM EQUIPMENT LIST
AC Electrical Load Distribution - Component Index
Figure 101 (Sheet 2)

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

747-400
FAULT ISOLATION/MAINT MANUAL

P714 PANEL
SEE  E  SHT 2  P515 PANEL 
SEE  D 
P615 PANEL 
SHT 2 
P6 PANEL  P180  P415 PANEL 
SEE  A  PANEL 
FLIGHT COMPARTMENT 
　
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