49-31-00
ALL ú ú 09 Page 6 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CONTROL AIR CONNECTION
ACCELERATION HIGH-PRESSURELIMITER FUEL PORTVALVE
FUEL FILTER FUEL GOVERNOR
FUEL
CONTROL UNIT
FUEL PRESSURE
DRAIN PORT FOR
PORT THE FUEL
INLET
LEGEND CONTROL AIR DRAIN HIGH-PRESSURE FUEL LOW-PRESSURE FUELCOMBUSTOR UNIT
FLOW
DIVIDER
VALVE
FUELFUEL SOLENOID ATOMIZER
VALVE COMPRESSOR
HIGH-PRESSURE SECTIONFUEL FILTER IGNITER
PLUG
COMBUSTION CHAMBER
TURBINE
SECTION
TURBINE FUEL
EXHAUST PUMP
APU CONTROL THERMOSTAT
COMPRESSOR AIR INLET GEARBOX FUEL DRAIN
ACCESSORY
CONNECTION PORT 3-WAY
FUEL INLET SOLENOID VALVE
LOW-PRESSURE
FUEL FILTER
DIFFERENTIAL PRESSURE FUEL HEATER
REGULATOR BLEED AIR OUTLET
CHECK VALVE RATE CONTROL VALVE
FUEL
SUPPLY BLEED AIR SWITCHER SOLENOID
VALVE VALVE
PNEUMATIC
ACTUATOR
APU Fuel System Schematic
Figure 2 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT ETC ú
49-31-00
ú ú 01 Page 7 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
CONTROL AIR CONNECTION
HIGH-PRESSURE FUEL PORT
ACCELERATION LIMITER VALVE
FUEL SOLENOID VALVE
FUEL GOVERNOR
FUEL
CONTROL UNIT
FUEL PRESSURE
DRAIN PORT FOR
PORT THE FUEL
INLET
FUEL HEATER
CHECK VALVE
DIFFERENTIAL PRESSURE REGULATOR 3-WAYSOLENOID VALVE
COMBUSTOR
UNIT
FLOW
DIVIDER
VALVE
FUEL
HIGH-PRESSURE COMPRESSOR ATOMIZER
FUEL FILTER SECTION
IGNITER
FUEL PUMP PLUG CHAMBER COMBUSTION
TURBINE
SECTION
TURBINE
EXHAUST
ETC
THERMOCOUPLE
CHECK VALVE
FOR THE
COMPRESSOR AIR INLET TURBINE DRAIN
ACCESSORY GEARBOX LEGEND CONTROL VALVE PROPORTIONAL
CONNECTION CONTROL AIR
PORT FOR
THE FUEL DRAIN
INLET HIGH-PRESSURE FUEL INLET
LOW-PRESSURE FUEL TEMP
FUEL FILTER LOW-PRESSURE ETC GAUGE EGT
BLEED
FUEL AIR OUTLET
SUPPLY
BLEED AIR SWITCHER SOLENOID
VALVE VALVE
PNEUMATIC
ACTUATOR
RATE CONTROL VALVEORIFICE TEST PORT
APU Fuel System Schematic Figure 2 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ETC ú
49-31-00
ú ú 01 Page 8 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C. AIRPLANES WITH THE ETC; The exhaust gas temperature is controlled by the electronic temperature control (ETC). For a more detailed description of the ETC, refer to AMM 49-61-00/001.
D. AIRPLANES WITHOUT THE ETC; The exhaust gas temperature (EGT) is controlled by the APU control thermostat. The APU control thermostat has two functions:
(1)
The APU control thermostat is an acceleration control thermostat at an APU speed up to 95%. When the EGT is higher than 620-649°C (1150-1200°F), the APU control thermostat opens to bleed control air from the acceleration limiter valve. This permits the bypass valve of the fuel control unit to send fuel back to the inlet fuel port and will decrease the EGT. When the EGT decreases below the specified limit, the APU control thermostat closes. When the APU control thermostat closes, the bleed air from the acceleration limiter valve stops and the bypass valve closes.
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