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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A
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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