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from the burners to the drain tank to be purged. During engine start, fuel from the tank is returned to
the LP fuel pump.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - SHUT-OFF VALVES
Intentionally left blank
A330/A340 FLEET DSC-70-40-30 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - HYDROMECHANICAL UNIT / FUEL METERING UNIT
A330/A340 FLEET DSC-70-40-40 P 1/8
FCOM 19 AUG 10
GENERAL
Applicable to:
The FADEC controls the HMU, which :
controls fuel flow to ‐ the engine combustion chamber
‐ controls fuel hydraulic signals to actuators
‐ protects against overspeeding
GENERAL
Applicable to: ,
The FMU is controlled by the FADEC, and performs :
‐ Control of the fuel flow to the engine combustion chamber through the Fuel Metering Valve
(FMV) ;
‐ Overspeed protection by closing the HP shutoff valve ;
‐ Actuation of the HP shutoff valve to start, or stop, the engine.
FUEL FLOW
Applicable to:
L3 The Fuel Metering Valve (FMV) transforms FADEC orders through a torque motor and servovalve
into fuel flow to the engine fuel nozzles.
The FMV resolver generates a feedback signal proportional to the FMV position.
The bypass valve maintains a constant pressure drop across the FMV to ensure that the metered
fuel flow is proportional to the FMV position.
L1 The FADEC computes the fuel flow that will maintain the target N1.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - HYDROMECHANICAL UNIT / FUEL METERING UNIT
A330/A340 FLEET DSC-70-40-40 P 2/8
FCOM 19 AUG 10
As the FADEC maintains this N1, it allows N2 to vary while remaining between N2 minimum and N2
maximum. The FADEC also controls the engine parameters to :
‐ Limit acceleration and deceleration ;
‐ Avoid engine stall or flameout ;
‐ Limit max N1 and N2 ;
‐ Maintain the air bleed pressure requirement.
The FADEC computes the N2 correction according to the bleed configuration.
FUEL FLOW
Applicable to: ,
L3 The Fuel Metering Valve (FMV) transforms FADEC orders through a torque motor and servovalve
into fuel flow to the engine fuel nozzles.
The FMV resolver generates a feedback signal proportional to the FMV position.
The bypass valve maintains a constant pressure drop across the FMV to ensure that the metered
fuel flow is proportional to the FMV position.
L1 The FADEC computes the fuel flow that will maintain the target EPR.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - HYDROMECHANICAL UNIT / FUEL METERING UNIT
A330/A340 FLEET DSC-70-40-40 P 3/8
FCOM 19 AUG 10
As the FADEC maintains this EPR, it allows N3 to vary while remaining between N3 minimum and
N3 maximum. The FADEC also controls the engine parameters to :
‐ Limit acceleration and deceleration ;
‐ Avoid engine stall or flameout ;
‐ Limit max EPR, N1, N2 and N3 ;
‐ Maintain the air bleed pressure requirement.
The FADEC computes N3 correction, according to the bleed configuration.
OVERSPEED GOVERNOR SYSTEM
Applicable to:
Independent of the FADEC, the overspeed governor limits the N2 by opening the fuel bypass valve,
in the event of a malfunction that could lead to an overspeed condition.
OVERSPEED PROTECTION
Applicable to: ,
TURBINE OVERSPEED PROTECTION (TOS)
The FADEC provides protection against LP turbine overspeed, due to LP shaft breakage between
compressor and turbine. If it occurs, the engine is shut down by closing the HP shut-off valve.
OVERSPEED PROTECTION UNIT (OPU)
Independent of the FADEC, the engine is fitted with the N1/N2 overspeed protection unit. In the
event of overspeed condition detected by the OPU, which occurs when N1 reaches 110 % or N2
reaches 117 % , the OPU controls the engine shutdown by closing the HP shut-off valve.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - HYDROMECHANICAL UNIT / FUEL METERING UNIT
A330/A340 FLEET DSC-70-40-40 P 4/8
FCOM 19 AUG 10
IDLE CONTROL
Applicable to: ALL
The FADEC has the following three idle modes :
Modulated idle
‐ Is regulated according to :
• Bleed system demand
• Oil temperature
• Mach number.
‐ Is selected :
• In flight, when the flaps are retracted and the gear is up.
• On ground, provided reverse is not selected.
Approach idle
‐ Is regulated according to aircraft altitude, regardless of bleed system demand.
　
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