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If oil temperature still keeps rising, the FADEC increases the fuel flow to the tank (from 300 to
600 kg/h, depending on fuel return temperature).
The fuel return valve is always mixing hot fuel with cold fuel so that the temperature of fuel returning
to the tank stays below 100 °C (from 200 to 400 kg/h, depending on fuel return temperature).
Fuel recirculation to the tank is inhibited (FVR closed) in the following cases :
‐ at engine shutdown
‐ during takeoff and climb
‐ if :
• wing tank level is below about 280 kg (620 lb).
• there is fuel overflow in the surge tank
• fuel feed is by gravity only.
‐ when fuel temperature in the wing tank in flight is above 52.5 °C
Note: On the ground high fuel temperature in the wing tanks does not cause the FRV to close.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (CFM) - IDG COOLING SYSTEM
A318/A319/A320/A321 FLEET DSC-70-40-50 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - GENERAL
A318/A319/A320/A321 FLEET DSC-70-45-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: MSN
4566,,,
The fuel system enables the combustion of fuel under appropriate conditions of flow rate and
pressure. The FADEC controls the fuel supply via the Fuel Metering Unit (FMU).
High pressure fuel is also used to provide pressure for some actuators.
The major components are :
‐ High and low pressure fuel pumps (dual unit)
‐ Fuel/oil heat exchanger
‐ Low pressure fuel filter
‐ Fuel Metering Unit (FMU)
‐ Fuel distribution valve
‐ 20 fuel injectors
‐ Diverter and return to tank valve
‐ IDG fuel/oil heat exchanger.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - GENERAL
A318/A319/A320/A321 FLEET DSC-70-45-10 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL PUMP UNIT
A318/A319/A320/A321 FLEET DSC-70-45-20 P 1/2
FCOM 19 AUG 10
FUEL PUMP UNIT
Applicable to: MSN
4566,,,
Consists of the low and high pressure stages which are driven from a common gearbox output shaft.
The LP stage ‐ increases the pressure to :
• suppress the cavitation
• account for the pressure losses of the fuel oil heat exchanger and the low pressure fuel filter
• provide enough pressure at the inlet of the HP stage
‐ The HP stage increases the pressure to the appropriate level for optimum fuel flow and
atomization at all engine operating conditions.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL PUMP UNIT
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-70-45-20 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL OIL HEAT EXCHANGER
A318/A319/A320/A321 FLEET DSC-70-45-30 P 1/2
FCOM 19 AUG 10
FUEL OIL HEAT EXCHANGER
Applicable to: MSN
4566,,,
Enables fuel to be heated by the oil, to reduce temperature of the oil, and prevent fuel icing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL OIL HEAT EXCHANGER
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-70-45-30 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL METERING UNIT
A318/A319/A320/A321 FLEET DSC-70-45-40 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: MSN
4566,,,
The FADEC controls the Fuel Metering Valve (FMV) which transforms its orders through three torque
motors/servo valves.
The FMV :
‐ controls the fuel flow
‐ protects against overspeeding (by reducing down to the minimum fuel flow).
‐ controls the shut off valve (to start or stop the engine)
‐ supplies high pressure fuel to the various actuators.
The three FADEC controlled torque motors are used to direct fuel servo pressure to open/close three
valves :
‐ the fuel metering valve meters the fuel supply.
‐ The overspeed valve reduces the fuel flow in case of a FADEC detected overspeed. This
reduction is made according to a preset value.
Once this valve is operated it remains in the minimum fuel flow position until the engine is
shutdown.
‐ The shut off valve opens/closes to isolate fuel supplies for starting or stopping the engine.
　
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