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THERMOCOUPLE - EXHAUST GAS TEMPERATURE  1  6  COMPARTMENT) 317AL, 318AR/310 (APU  49-61-03 
TRANSFORMER - CURRENT (NO. 1), T1503  3  1  823R/146AZ, ACCESS STATION 2160  49-61-11 
TRANSFORMER - CURRENT (NO. 2), T1504  3  1  823R/146AZ, ACCESS STATION 2160  49-61-11 
UNIT - SERIAL NUMBER IDENTIFICATION, M3373  1  1  COMPARTMENT) 317AL, 318AR/310 (APU  49-61-10 

APU Control System - Component Index
Figure 101

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A 747-400 FAULT ISOLATION/MAINT MANUAL 
SEE  A 
A 
SEE  B  A  FWD 
SEE  D 
T1515/T1508 AIR TEMPERATURE SENSOR T1/T6,  SEE  C PLENUM INLET AIR APU COMPARTMENT PLENUM AIR INLET  INLET T1502 PRESSURE SENSOR P1, 
M3372 THERMOCOUPLE TRIM BOX T6, 
FWD  IDENTIFICATION UNIT, SERIAL NUMBER M3373  FWD 
A  B 
(6 LOCATIONS) THERMOCOUPLE TEMPERATURE EXHAUST GAS  SENSOR SPEED N2, T1506  GEARBOX ACCESSORY 
FWD  AIR DUCT DIVERTER 
A-A  C 
APU Controls - Component Location Figure 102 (Sheet 1) 

L46922
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
SEE  E 
SEE  F  COOLING FAN INLET DUCT  OUTLET TEMPERATURE SENSOR T13, T1514 LOAD COMPRESSOR 
FWD  SEE  G  OUTLET DUCT LOAD COMPRESSOR 
D APU COMPARTMENT  FWD 
E 

SENSOR T12, T1513 LOAD COMPRESSOR INLET TEMPERATURE STARTER MOTOR 
LOAD GEARBOX SPEED SENSOR N1, T1505  F  FWD  LOAD GEARBOX  FWD  G 
APU Controls - Component Location Figure 102 (Sheet 2) 

F59067
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A

747-400 
FAULT ISOLATION/MAINT MANUAL 
ACCESS STATION 2160 
BULKHEAD DOOR, 146AZ 
SEE  I  J 
DOOR FOR THE 
BULK CARGO 
DOOR FOR THE  COMPARTMENT, 
BULK CARGO  823R 
823R COMPARTMENT,  BULK CARGO COMPARTMENT 
SEE  H  H 

FWDNO. 2 CURRENT TRANSFORMER, FWD NO. 1 CURRENT TRANSFORMER,T1504 T1503
RIGHT STATION 2160 BULKHEAD LEFT STATION 2160 BULKHEAD
I J
PILOTS' OVERHEAD 
MAINTENANCE  APU 
PANEL, P461  SWITCH, S21 APU CONTROL  OFF  ON  START 
SEE  L 

APU START
K
SOURCE SWITCH, M6806
SEE K
APU START SOURCE TR PILOTS' OVERHEAD PANEL, P5
APU BATTERY
FLIGHT COMPARTMENT  L
APU Controls - Component Location Figure 102 (Sheet 3)
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A

747-400 
FAULT ISOLATION/MAINT MANUAL 
SEE  N 
AFT EQUIPMENT 
CENTER, E8 
SEE  M 
APU CONTROLLER, 
M7847 
SEE  O 
FWD 
AFT EQUIPMENT CENTER, E8 
M 

FWD FWD
N
APU CONTROLLER, M7847 O
APU Control System - Component Location
　
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