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‐ Selected in flight, when the FLAPS are extended to FLAP 2, FLAP 3, or FULL, or when the
landing gear is down.
‐ Allows the engine to rapidly accelerate from idle to go-around thrust.
Reverse idle
‐ Selected on ground, when reverse idle thrust is selected.
‐ Slightly higher than forward idle thrust.
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 5/8
FCOM 19 AUG 10
FUEL HYDRAULIC SIGNALS
Applicable to: ,
L3 Fuel hydraulic signals are sent to :
‐ Air/Oil heat Exchanger Control Valve
‐ Variable Stator Vanes (VSVs) and Variable Inlet Guide Vanes (VIGVs)
The FADEC controls the VSV/VIGV system which positions the compressor variable vanes to
provide optimum intermediate pressure and high pressure compressor efficiency to prevent surge
during transient engine operations.
VSVs/VIGVs are fully closed at low engine power, and are fully open at high power.
VIGVs are controlled closed, if the FADEC detects an intermediate pressure or low pressure
turbine overspeed.
FUEL HYDRAULIC SIGNALS
Applicable to:
L3 Fuel hydraulic signals go to :
‐ Low Pressure Turbine Clearance Control (LPTCC) valves.
Refer to DSC-70-60 COOLING
‐ High Pressure Turbine Clearance Control (HPTCC) valves.
Refer to DSC-70-60 COOLING
‐ Rotor Active Clearance Control (RACC) system.
Refer to DSC-70-60 COOLING
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 6/8
FCOM 19 AUG 10
‐ Variable Stator Vanes (VSVs)
The VSVs system positions the compressor variable vanes.
The FADEC maintains optimum compressor efficiency at a steady state and an adequate stall
margin for transient engine operation.
VSVs are fully closed during engine start, and are fully open at high thrust.
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 7/8
FCOM 19 AUG 10
‐ Variable Bleed Valves (VBVs)
The FADEC controls the VBVs, upstream of the HP compressor. Their setting depends on
compressor inlet temperature and on N2. It varies between full open (start, low thrust, and during
fast deceleration) and full closed (high thrust) positions.
‐ Burner Staging Valve (BSV) :
The FADEC controls the BSV, which allows fuel to go to either 10 or 20 fuel nozzles :
• It supplies 10 nozzles permanently.
• It supplies the other 10 nozzles when the engine requires a high fuel-air ratio (BSV open).
The BSV is closed during engine deceleration and low idle.
If the fuel control system fails, an internal safety system ensures that all nozzles are supplied.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - HYDROMECHANICAL UNIT / FUEL METERING UNIT
Intentionally left blank
A330/A340 FLEET DSC-70-40-40 P 8/8
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - IDG OIL COOLING SYSTEM
A330/A340 FLEET DSC-70-40-50 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to:
Fuel flow from the HMU is partly used as a cooling agent for the IDG oil system ; it then returns to the
fuel pump unit or to the tank.
L3 Fuel for IDG cooling is tapped downstream of the HP pump.
It goes through the integrated drive generator (IDG) heat exchanger (where it absorbs heat).
A part of the fuel is returned upstream of the HP pump.
The other part is returned to the inner tank when the fuel return valve is controlled open by the
FADEC.
A cold flow (from the LP pump) is mixed to the hot flow returning to the tank to reduce returning fuel
temperature.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM - IDG OIL COOLING SYSTEM
A330/A340 FLEET DSC-70-40-50 P 2/2
FCOM 19 AUG 10
RECIRCULATION FUEL FLOW CONTROL LOGIC
Applicable to:
The FADEC controls the fuel flow to the tank through the fuel return valve, according to the engine oil
temperature (which is dependent on the IDG oil temperature). There are two levels of recirculation.
The flow also depends on the inner tank fuel temperature and the flight/ground condition.
At low engine power if oil temperature still increases the FADEC increases the modulated idle.
A fuel flow of 950 kg/h is recirculated when the engine oil temperature reaches 70 °C (50 °C when
the fuel temperature is above 15 °C). It is stopped when the temperature decreases to 60 °C (40 °C
　
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