BLEED AIR
SWITCH
APU
OFF
APU MASTER SWITCH
ON START
Auxiliary Power Unit Component Location
Figure 1 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BLEED AIR
VALVE
BLEED AIR
FLOW
OIL CONTROL
LEVEL VALVE SHUTOFFINTERSTAGE
SWITCH
TURBINE
DUCT COOLING VALVE
COMPRESSOR
AIR FAN FOR THEWHEEL PLENUM OIL COOLING COOLER AIR
TURBINE
PLENUM SURGE
BLEED
VALVE
COMPRESSOR APU ELECTRICALTURBINE INLET AIR GENERATORTORUS
COOLING AIR OIL
EXHAUST
PORT
TURBINE
EXHAUST
THERMO-
COUPLE
PROBE
APU
ACCESSORY GEARBOX
PRESSURE
OIL
SWITCHES
PUMP
ASSEMBLY
OIL
TEMPERATURE
TACHOMETER
SWITCH
GENERATOR
ELECTRONIC
CONTROL SPEED SWITCH
THERMOSTAT
FUEL DRAIN SECOND STAGE FIRST STAGE STARTER TIME ELAPSED
COMPRESSOR COMPRESSOR MOTOR INDICATOR
COMBUSTION
CHAMBER FUEL CONTROL
ATOMIZER UNIT IGNITION FUEL UNIT VALVE FLOW CONTROL
PUMP
IGNITER
PLUG HIGH-PRESSURE LOW-PRESSURE FUEL FILTER
FUEL FILTER
GOVERNOR
BLEED FUEL HEATER
FUEL OVERBOARD
VALVE SOLENOID LIMITER ACCELERATION VALVE CHECK SHROUD DRAIN OVERBOARD
FOR THE
FUEL FUEL LINE
HEATER SHROUD
3-WAY
SOLENOID VALVE AIRPLANE FUEL TANK, FUEL PRESSURE INLET AIR NO. 1
APU FUEL VALVE FUEL SUPPLY COMPRESSED AIR
CONTROL AIR TURBINE GAS
Auxiliary Power Unit Block Diagram Figure 2 (Sheet 1)
E75898
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
BLEED AIR VALVE
BLEED AIR
FLOW
OIL CONTROL
LEVEL VALVE
SHUTOFF TURBINE
INTERSTAGE A SWITCH
DUCT COOLING VALVE
COMPRESSOR AIR FAN FOR THEWHEEL PLENUM
OIL COOLING COOLER AIR
TURBINE
PLENUM SURGE
BLEED
VALVE
COMPRESSOR APU ELECTRICALTURBINE INLET AIR GENERATORTORUS
COOLING THERMO-
ETC
AIR COUPLE
OIL
EXHAUST
PROBE
PORT
TURBINE
EXHAUST
B
ACCESSORY GEARBOX
PRESSURE
OIL
SWITCHES
PUMP
ASSEMBLY
OIL
TEMPERATURE
TACHOMETER
SWITCH
GENERATOR
B
T2
ETC
ELECTRONIC
SENSOR
SPEED SWITCH
PROPORTIONAL CONTROL VALVE SECOND STAGE COMPRESSOR COMPRESSOR FIRST STAGE MOTOR STARTER INDICATOR TIME ELAPSED A
FUEL DRAIN IGNITION
FUEL CONTROLUNIT FLOW CONTROLUNITCOMBUSTION IGNITER VALVECHAMBER FUELPLUG
PUMP ATOMIZER LOW-PRESSURE
HIGH-PRESSURE FUEL FILTER
FUEL FILTER
GOVERNOR
BLEED
FUEL HEATER OVERBOARD FUEL ACCELERATIONSOLENOID CHECK OVERBOARDLIMITERVALVE VALVE
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