P3 TAP
P3 1 SHT 2
OPEN
DIVERTER VALVE CONTROL
P
AMB
ADJ
TORQUE
MOTOR
TO EXHAUST
TO ECS
PD
LINEAR VARIABLE DIFFERENTIAL TRANSDUCER
FLOW SENSOR  OBDP 
S2P  RATE  2  SHT 2 
LIMITING 
TEST PORT  ORIFICE  3  SHT 2 
P2 

4 SHT 2
TUBE ASSEMBLY (SENSE LINE)
P13
LEGEND:
COMPRESSOR DISCHARGE PRESSURE, P3 LOAD COMPRESSOR DISCHARGE, P13 P
DIFFUSER TOTAL PRESSURE, S2 SERVO REGULATED FUEL PRESSURE DIVERTER VALVE MODULATED PRESSURE
APU Control Air System Schematic Figure 2 (Sheet 1)
B51034
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A

747-400 MAINTENANCE MANUAL
VENT
SHT 1 1
RATE SENSOR 
MUSCLE SERVO UNIT METERING FROM FUEL FUEL PRESSURE  IGV ACTUATOR  TORQUE MOTOR 
SHT 1  2  DP  RP 
SHT 1  3 
SHT 1
 4  TO FUEL PUMP  RETRACT SERVO VALVE  EXTEND  ELECTRICAL CONNECTOR 
EXTEND  RETRACT  OBDP  TRANSDUCER DIFFERENTIAL VARIABLE LINEAR 
Figure 2 (Sheet 2) APU Control Air System Schematic 

M32248
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A
747-400
FAULT ISOLATION/MAINT MANUAL

APU DIVERTER AND IGV CONTROL SYSTEM

APU Diverter and IGV Control System - Component Index
Figure 101

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F82190
A

747-400 FAULT ISOLATION/MAINT MANUAL
SEE C SEE A
FWD 
SEE  B 
APU COMPARTMENT 
TUBE ASSEMBLY 
(SENSE LINE) 
DIVERTER VALVE 
CONTROL, V409 
P3 AIR FILTER 

RATE
SENSOR
LOAD COMPRESSOR
SCROLL HOUSING
FWD FWD B
A
APU Diverter and IGV Control System - Component Location
Figure 102 (Sheet 1)

B51035
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A
747-400 FAULT ISOLATION/MAINT MANUAL
SEE  D 
SEE  E  DIVERTER VALVE 
FWD APU COMPARTMENT C  MUFFLER DIVERTER VALVE 

FWD
D
INLET GUIDE VANE ACTUATOR, M3377
FWD
E
APU Diverter and IGV Control System - Component Location
Figure 102 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 INLET GUIDE VANE ACTUATOR - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  This procedure contains the tasks for the removal and the installation of the actuator for the inlet guide vane (IGV).
　
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