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The filter cartridge is installed in a cavity in the fuel pump body. The fuel circulates from the outside to the inside of the filter cartridge.
In case of a clogged filter, the by-pass valve opens to allow fuel to pass to the fuel pump HP stage.
Tappings on the filter housing enable the installation of a differential pressure switch that transmits filter clogging conditions to the A/C monitoring system.
The cartridge has a filtering capability of 38 microns absolute.
Maintenance practices
Fuel filter removal/installation and check.
The filter must be removed and visually inspected after any ECAM “Fuel filter clogged” warning messages, or when significant contamination is found at the bottom of the filter cover. This inspection can help to determine any contamination of aircraft, or engine fuel systems.
Re-install the fuel filter cover with the bolts, washers and nuts provided, carefully following the torquing sequence.
Perform a wet motoring check for leakage.

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VISUAL INSPECTION OF THE FUEL FILTER CARTRIDGE
CTC-201-094-01
EFFECTIVITY
73-11-10 Page 19
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
Maintenance practices
Visual inspection of impeller rotation.
This inspection must be done during troubleshooting when the procedure calls for it, or when a broken shaft is suspected and the rotation of the LP impeller has to be checked.
The plug is removed, and the engine is cranked through the handcranking pad.
If the impeller turns, the check is positive.
If the impeller does not turn, replace the fuel pump and continue the troubleshooting procedure to determine if there is any further engine damage.
After fuel pump replacement, perform an idle leak check and FADEC ground test with motoring.

EFG
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CTC-201-095-01  VISUAL INSPECTION OF IMPELLER 
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION
 73-11-10 ENGINE SYSTEMS  Page 21 Jan 03 

CFM56-5B TRAINING MANUAL
EFG
THIS PAGE INTENTIONALLY LEFT BLANK

EFG
MAIN OIL/FUEL HEAT EXCHANGER

EFFECTIVITY
79-21-20 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
MAIN OIL/FUEL HEAT EXCHANGER
The purpose of the main oil/fuel heat exchanger is to cool the scavenged oil with cold fuel, through conduction and convection, inside the exchanger where both fluids circulate.
The exchanger is installed at the 7 o’clock position, on the fuel pump housing.
　
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