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To filter the fuel before it is delivered to the fuel control system.
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To drive the HMU.
The engine fuel pump is located on the accessory gearbox aft face, on the left hand side of the horizontal drive shaft housing.
The fuel supply line is routed from a hydraulic junction box, attached to the left hand side of the fan inlet case, down to the fuel pump inlet.
The fuel return line is routed from the Fuel Return Valve (FRV), along the left hand side of the fan case, and back up to the hydraulic junction box.
EFG
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EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION CTC-201-084-01 . . .
73-11-10 ENGINE SYSTEMS Page 3 Jan 03
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
The engine fuel pump is a two stage fuel lubricated pump and filter assembly.
First, the fuel passes through the boost stage, where it is pressurized.
At the outlet of the boost stage, it is directed to the main oil/fuel heat exchanger, and the FRV.
The fuel then goes back into the fuel pump, and passes through a disposable main fuel filter.
The clogging condition of the main fuel filter is monitored and displayed on an ECAM, through a differential pressure switch.
A by-pass valve is installed, in parallel with the filter, to by-pass the fuel in case of filter clogging.
At the filter outlet, the fuel passes through the HP stage pump.
A pressure relief valve is installed, in parallel with the gear pump, to protect the downstream circuit from over pressure.
At the gear stage outlet, the fuel passes through a wash filter, where it is split into two different fuel flows.
The main fuel flow, unfiltered, goes to the HMU. The other fuel flow, which is filtered, goes to the servo fuel heater and the FRV.
A by-pass valve is installed, in parallel with the filter, to by-pass the fuel in case of filter clogging.
EFG
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CTC-201-086-02
EFFECTIVITY
73-11-10 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
EFG
FUEL PUMP
Fuel pump housing.
The fuel pump housing encloses the fuel pump drive system, the LP and HP stages, the fuel filter, and the wash filter.
The fuel pump housing is secured onto the accessory gearbox with a Quick Attach/Detach (QAD) ring. The mounting flange is equipped with a locating pin to facilitate the installation of the fuel pump onto the AGB.
CFM56-5B TRAINING MANUAL
On the housing, fuel ports and covers are provided which are :
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Main filter by-pass valve cover.
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Supply to main heat exchanger.
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Return from main heat exchanger.
-Filter drain port.
-Upstream and downstream filter pressure taps.
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HP stage pressure relief valve cover.
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