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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (CFM) - HYDROMECHANICAL UNIT
A318/A319/A320/A321 FLEET DSC-70-40-40 P 4/6
FCOM 19 AUG 10
‐ Variable Bleed Valves (VBV)
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 Selection Valve (BSV)
The FADEC controls the BSV, which allows fuel to go either to 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.
FUEL HYDRAULIC SIGNALS
Applicable to:
,
,
MSN
L3 Fuel hydraulic signals go to :
Low Pressure Turbine ‐ Clearance Control (LPTCC) valves
(Refer to DSC-70-60 GENERAL)
‐ High Pressure Turbine Clearance Control (HPTCC) valves
(Refer to DSC-70-60 GENERAL)
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (CFM) - HYDROMECHANICAL UNIT
A318/A319/A320/A321 FLEET DSC-70-40-40 P 5/6
FCOM 19 AUG 10
‐ Rotor Active Clearance Control (RACC) system
(Refer to DSC-70-60 GENERAL)
‐ Variable Stator Vanes (VSV)
The VSV 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.
‐ Variable Bleed Valves (VBV)
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FUEL SYSTEM (CFM) - HYDROMECHANICAL UNIT
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-70-40-40 P 6/6
FCOM 19 AUG 10
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 1/4
FCOM 19 AUG 10
IDG COOLING SYSTEM
Applicable to:
Some of the fuel flowing out of the HMU goes to cool the oil systems of the Integrated Drive
Generators (IDGs). It then returns to the fuel pump unit or to the tank.
The Fuel Return Valve (FRV), controlled by the FADEC, ensures that this flow is adequate.
L3 At low engine thrust, if the oil going into the IDG is too hot, the cooling fuel is sent back to the tank
(300 kg/h).
If oil temperature continues to rise, the ECU increases the minimum N2.
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 300 kg (660 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 2/4
FCOM 19 AUG 10
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 3/4
FCOM 19 AUG 10
IDG COOLING SYSTEM
Applicable to: ,
, MSN
Some of the fuel flowing out of the HMU goes to cool the oil systems of the Integrated Drive
Generators (IDGs). It then returns to the fuel pump unit or to the tank.
The Fuel Return Valve (FRV), controlled by the FADEC, ensures that this flow is adequate.
L3 At low engine thrust, if the oil going into the IDG is too hot, the cooling fuel is sent back to the tank
(300 kg/h).
If oil temperature continues to rise, the ECU increases the minimum N2.
　
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