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The servo pressure regulator regulates the pressure for FMU internal use.
The FADEC computes the fuel flow that will maintain the target EPR.
As the FADEC maintains this EPR, it allows N2 to vary while remaining between minimum N2 and
maximum N2.
The FADEC also controls the engine parameters to :
‐ Limit acceleration and deceleration ;
‐ Avoid engine stall or flameout ;
‐ Limit maximum N1 and N2 ;
‐ Maintain air bleed pressure requirement.
The FADEC computes an N2 correction according to the bleed configuration.
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 2/4
FCOM 19 AUG 10
IDLE CONTROL
Applicable to: MSN
4566,,,
The FADEC has the following three idle modes :
Modulated idle
‐ Is regulated according to :
• bleed system demand
• ambient conditions
‐ Is selected :
• In flight, when the flaps are retracted (FLAPS lever at zero position)
• On ground, provided reverse is not selected.
Approach idle
‐ Is regulated according to aircraft altitude, regardless of bleed system demand.
‐ Is selected in flight, when the flaps are extended (FLAPS lever not at zero position)
‐ Allows the engine to accelerate rapidly from idle to go-around thrust.
Reverse idle
‐ Is selected on ground, when the thrust lever is in REV IDLE position.
‐ Is slightly higher than forward idle thrust.
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 3/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL METERING UNIT
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-70-45-40 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL FILTER
A318/A319/A320/A321 FLEET DSC-70-45-50 P 1/2
FCOM 19 AUG 10
FUEL FILTER
Applicable to: MSN
4566,,,
Cockpit indication is provided by a differential pressure switch.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - FUEL FILTER
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A318/A319/A320/A321 FLEET DSC-70-45-50 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - IDG COOLING RECIRCULATION SYSTEM
A318/A319/A320/A321 FLEET DSC-70-45-60 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: MSN
4566,,,
Cooling of IDG oil and engine oil are accomplished respectively by the IDG cooler and by the Fuel/Oil
heat exchanger.
Fuel, IDG oil and engine oil temperatures are regulated by the EEC commanding the fuel diverter
valve and the return to tank valve in four operation modes.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - IDG COOLING RECIRCULATION SYSTEM
A318/A319/A320/A321 FLEET DSC-70-45-60 P 2/4
FCOM 19 AUG 10
TWO RETURNS TO TANK MODES
Applicable to: MSN
4566,,,
TWO NO-RETURNS TO TANK MODES
Applicable to: MSN
4566,,,
L3Modes selected when return to tank is not allowed, in particular in case of high fuel flow or high tank
fuel temperature.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - IDG COOLING RECIRCULATION SYSTEM
A318/A319/A320/A321 FLEET DSC-70-45-60 P 3/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (IAE) - IDG COOLING RECIRCULATION SYSTEM
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-70-45-60 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
OIL SYSTEM
A318/A319/A320/A321 FLEET DSC-70-50 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to:
, ,
MSN
The oil system lubricates the engine components.
It contains :
‐ the oil tank
‐ the lube and scavenge pump modules
‐ the fuel/oil heat exchanger
‐ the filters, chip detectors, pressure relief and bypass valves.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
OIL SYSTEM
A318/A319/A320/A321 FLEET DSC-70-50 P 2/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
　
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