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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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APU FUEL SYSTEM - FUEL CONTROL UNIT
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
Fuel for the APU fuel control unit (FCU) comes from the airplane
fuel system. The APU FCU supplies fuel for combustion and
servo fuel to operate the inlet guide vane actuator (IGVA) and
the surge control valve (SCV).
The FCU includes these components:
* Inlet filter
* High pressure fuel pump
* Pump relief valve
* High pressure filter
* Differential pressure regulator
* Bypass bleed orifice
* Torque motor metering valve
* Pressurizing valve and flow meter
* Actuator pressure regulator
* Fuel solenoid valve
* Fuel temperature sensor.
Inlet Filter
The inlet filter removes contamination before the fuel goes into
the high pressure gear pump.
High Pressure Fuel Pump and Pump Relief Valve
A shaft from the lube module turns the high pressure fuel pump.
The pump gives high pressure fuel for use in the FCU. The
pump relief valve keeps fuel pressure below 950 psi.
High Pressure Filter
The high pressure filter removes contamination caused by the
gear pump.
Actuator Pressure Regulator
The actuator pressure regulator keeps actuator fuel pressure at
250 psid. The FCU uses actuator fuel pressure to operate the
inlet guide vane actuator and surge control valve.
Differential Pressure Regulator
The differential pressure regulator holds a constant differential
pressure of 50 psid across the metering valve.
Bypass Bleed Orifice
The bypass bleed orifice is installed between the torque motor
metering valve and the input shaft of the high pressure fuel
pump. Metered valve discharged fuel from the torque motor
flows to the delta-P regulator and bypassed fuel goes through
the bypass bleed orifice and into the input shaft of the high
pressure fuel pump.
Fuel Metering Valve
The torque motor metering valve is an electrohydraulic servo
valve. It controls the amount of fuel to the combustion chamber.
APU FUEL SYSTEM - FUEL CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Flow Meter Pressurizing Valve And Flow Meter
The flow meter pressurizing valve keeps a 50 psi decrease in
fuel pressure from the fuel metering valve to the fuel shutoff
solenoid. A resolver attaches to the valve to measure valve
position. The ECU uses this signal to find the fuel flow to the
APU combustor.
Fuel Solenoid Valve
The fuel solenoid valve controls the fuel flow from the fuel
control unit. The fuel solenoid valve is spring loaded closed.
During APU start, the ECU energizes the solenoid at 7 percent
speed. This opens the fuel solenoid valve.
During shutdown, the ECU deenergizes the solenoid. The fuel
solenoid valve closes. This shutdown sequence is the same for
normal or protective shutdown.
Fuel Temperature Sensor
The fuel temperature sensor is a resistive temperature device
(RTD). The fuel temperature sensor gives a fuel temperature
signal to the ECU.
APU FUEL SYSTEM - FUEL CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2006
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-30-00-003
APU FUEL SYSTEM - FUEL CONTROL UNIT - FUNCTIONAL DESCRIPTION
APU FUEL SYSTEM - FUEL CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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APU FUEL SYSTEM - FUEL CONTROL UNIT - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The fuel flow divider directs fuel to the primary and secondary
manifolds.
Location
The fuel flow divider is on the lower left side of the APU engine
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