Bleed Air System Schematic
Figure 2 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT ETC ú
49-52-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 3-WAY SOLENOID VALVE
FUEL CONTROL UNIT
PORT DRAIN FUEL PRESSURE PORT FOR THE FUEL INLET
FUEL HEATER
CHECK VALVE
COMBUSTOR UNIT
FLOW
DIVIDER
VALVE
FUEL
HIGH-PRESSURE COMPRESSOR ATOMIZER
FUEL FILTER SECTION IGNITER
PLUG
FUEL COMBUSTION
PUMP CHAMBER
TURBINE
SECTION
TURBINE
EXHAUST
ETC
THERMOCOUPLE
CHECK VALVE FOR
THE TURBINE DRAIN COMPRESSOR AIR INLETACCESSORY PROPORTIONALGEARBOX CONTROL VALVELEGEND
CONTROL AIR PORT FOR CONNECTION
DRAIN THE FUEL INLETHIGH-PRESSURE FUEL
INLET TEMP
LOW-PRESSURE FUEL EGT
ETCLOW-PRESSURE
GUAGE FUEL FILTER
BLEED AIR OUTLET
FUEL
SUPPLY
SOLENOID VALVE BLEED AIR SWITCHER
VALVE
PNEUMATIC ACTUATOR
RATE CONTROL VALVE
Bleed Air System Schematic
Figure 2 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ETC ú
49-52-00
ú ú 01 Page 8 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
7. Differential Air Pressure Regulator (Fig. 1)
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A. The differential pressure regulator supplies a constant air pressure to the bleed air valve. This permits the bleed air valve to operate independently of the ambient temperature and ambient pressure. The differential pressure regulator is installed on the bleed air valve. The differential pressure regulator has a cover with an inlet fitting and air filter. Also, the differential pressure regulator has a main housing with a spring-loaded diaphragm assembly, metering valve, and relief valve. The differential pressure regulator is set to approximately 19 psig (131 kPa).
8. Surge Bleed Valve (Fig. 1)
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A. The surge bleed valve is installed on the turbine plenum directly below the bleed air duct. The surge bleed valve operates when the APU engine speed is more than 95%, the airplane is in flight and the bleed air valve is closed. The surge bleed valve prevents a compressor surge at high altitudes.
9. Operation (Fig. 2)
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A. When the APU engine speed is more than 95%, electrical power is supplied to the circuit for the bleed air valve. With the BLEED AIR switch on the P5 forward overhead panel in the ON position, the solenoid for the bleed air valve is energized. The bleed air valve will open. With the bleed air valve open, the airplane pneumatic system can use the bleed air from the APU.
B. AIRPLANES WITH THE ETC; When the airplane pneumatic system uses the bleed air from the APU, the proportional control valve supplies the overload protection for the APU. In an overload condition, the EGT will increase. The proportional control valve will bleed the compressed air from the bleed air valve. The bleed air valve will close and the EGT will decrease.
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