CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL RETURN VALVE
The Fuel Return Valve (FRV) returns part of the fuel, flowing through the IDG oil cooler, back to the A/C fuel tank for recirculation.
The FRV is mounted on a bracket on the left hand side of the fan inlet case, at the 10 o’clock position, above the IDG oil cooler.
The interfaces are:
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The fuel return line to the A/C.
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The fuel drain tube.
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The Pb return tube.
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The fuel pump HP tube.
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The fuel pump LP tube (cold fuel).
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The IDG cooler inlet tube (hot fuel).
- Two electrical connectors linked to the ECU.
EFG
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CTC-201-129-02
EFFECTIVITY
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ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
73-11-50 Page 3
ENGINE SYSTEMS Jan 03
CFM56-5B TRAINING MANUAL
EFG
FUEL RETURN VALVE
The FRV assembly consists of:
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Solenoid valve, V1, to open the fuel shut-off valve.
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Solenoid valve, V2, to select the returning fuel flow levels.
The FRV has a metering system which includes:
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A flow control valve, to meter the fuel flows.
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A compensating valve, to make the metering system insensitive to pressure differences between cold and warm fuel flows.
- A mixing chamber, to mix cold and warm fuel flows.
-A shut-off valve, to isolate the engine fuel circuit from the A/C fuel tank return circuit.
-Switches, to provide the ECU with the position of the shut-off valve.
EFG
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CTC-201-131-02 .
EFFECTIVITY
73-11-50 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL RETURN VALVE
Inside the FRV, cold fuel from the fuel pump LP stage outlet is mixed with the warm fuel returning from the IDG oil cooler. This is to limit the temperature of the fuel going back to the A/C tank.
A shut-off system is provided to isolate the engine fuel circuit from the A/C fuel tank return circuit.
The FRV is fuel operated and electrically controlled through the ECU control logic.
The control logic of the FRV is dependent on the engine oil temperature.
Above a certain engine oil temperature, the ECU commands a LOW return fuel flow to the A/C.
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