Visual Inspection of the Fuel Filter Cartridge [CFML]

TASK 73-11-10-210-802-A
Visual Inspection of the Fuel Filter Cartridge

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 210
ZONE: 400

1. Reason for the Job
You must do this visual inspection after each removal of the fuel filter element (cartridge) related to an ECAM warning "FUEL FILTER CLOG", or "ENGINE X FUEL FILTER DEGRAD", or when you find an important contamination at the bottom of the fuel filter bowl during any replacement of the fuel filter cartridge, whatever the reason. This inspection will help to find any possible contamination of the aircraft and engine fuel supply systems.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-32-28-281-003-A	Sample Fuel for Microbiological Contamination Analysis
TASK 28-11-00-100-001-A	Cleaning of the Fuel Tanks
TASK 28-11-00-600-003-A	Removal of the Microbiological Particles
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-40-00-290-801-A	Borescope Inspection of Combustion Section and Fuel Nozzles
TASK 73-11-05-000-801-A	Removal of the Main Fuel Pump
TASK 73-11-05-400-801-A	Installation of the Main Fuel Pump
TASK 73-11-10-000-802-A	Removal of the Fuel Filter Cartridge
TASK 73-11-10-210-802-A	Visual Inspection of the Fuel Filter Cartridge
TASK 73-11-10-400-802-A	Installation of the Fuel Filter Cartridge
TASK 73-11-15-000-801-A	Removal of the Fuel Metering Unit (FMU) Fuel Strainer
TASK 73-11-15-100-801-A	Cleaning of the Fuel Metering Unit (FMU) Fuel Strainer
TASK 73-11-15-200-801-A	Visual Inspection of the Fuel Metering Unit (FMU) Fuel Strainer
TASK 73-11-15-400-801-A	Installation of the Fuel Metering Unit (FMU) Fuel Strainer
TASK 73-11-20-000-802-A	Removal of the Servo Fuel Heater (SFH)
TASK 73-11-20-400-802-A	Installation of the Servo Fuel Heater (SFH)
TASK 73-11-30-000-802-A	Removal of the Fuel Nozzles
TASK 73-11-30-400-802-A	Installation of the Fuel Nozzles
TASK 73-11-35-000-801-A	Removal of the Fuel Return Valve (FRV)
TASK 73-11-35-400-801-A	Installation of the Fuel Return Valve (FRV)
TASK 73-11-50-000-802-A	Removal of the Integrated Drive Generator (IDG) Oil Cooler
TASK 73-11-50-400-802-A	Installation of the Integrated Drive Generator (IDG) Oil Cooler
TASK 73-21-05-000-802-A	Removal of the Fuel Metering Unit (FMU)
TASK 73-21-05-400-802-A	Installation of the Fuel Metering Unit (FMU)
TASK 73-21-10-000-802-A	Removal of the Split Control Unit and Servo Valve Assembly (SCU/SVA)
TASK 73-21-10-400-802-A	Installation of the Split Control Unit and Servo Valve Assembly (SCU/SVA)
TASK 73-31-10-000-802-A	Removal of the Fuel Flow Transmitter
TASK 73-31-10-400-802-A	Installation of the Fuel Flow Transmitter
TASK 79-21-25-000-801-A	Removal of the Main Heat Exchanger
TASK 79-21-25-400-801-A	Installation of the Main Heat Exchanger
Examination of the Fuel Filter Cartridge for Contamination

3. Job Set-up
Subtask 73-11-10-941-070-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-11-10-010-080-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

4. Procedure
Subtask 73-11-10-420-075-A

A. If not already removed, remove the fuel filter cartridge (3) from its housing on the fuel pump (Ref. AMM TASK 73-11-10-000-802).

Subtask 73-11-10-210-058-A

B. Do the inspection of the cartridge
(1) Examine the inner wall of the fuel filter housing (1) and the bottom of the fuel filter bowl (2) to find contaminants. For identification of the various types of contamination, see step C.
(2) Examine the removed fuel filter cartridge (3) as follows:
(a) Take the filter cartridge (3) and examine it for contaminants.
(b) For identification of the various types of contamination, see step C.

Subtask 73-11-10-220-054-A

C. Identification of Various Types of Contamination
(1) Contamination by solids in small amounts (dirt, sand, metallic particles or sealant particles):

Examination of the Fuel Filter Cartridge for Contamination

NOTE: This can be considered as normal contamination of the engine main fuel filter.

(a) Replace the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).
(2) Contamination by solid in large amounts such as dirt, sand, metallic debris or sealant particles (no visible bronze particles).

Examination of the Fuel Filter Cartridge for Contamination

NOTE: Possible causes are contaminated fuel, contaminated aircraft fuel tank(s), damaged aircraft boost pump, damaged engine fuel pump, foreign material, etc.

(a) Replace the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).
(b) Remove the Fuel Metering Unit (FMU) fuel strainer (Ref. AMM TASK 73-11-15-000-801) and do a check of the FMU fuel strainer for contamination (Ref. AMM TASK 73-11-15-200-801).
(c) Install the FMU Fuel Strainer (Ref. AMM TASK 73-11-15-400-801).
(d) Do a check of the fuel filter cartridge (3) on the opposite engine:
1 Removal of the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802).
2 Fuel filter inspection (Ref. AMM TASK 73-11-10-210-802).
3 Installation of the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-400-802).
(e) Do a check of the aircraft fuel tanks and clean them (Ref. AMM TASK 28-11-00-600-003).
(f) Install a new fuel filter cartridge (3) on both engines (Ref. AMM TASK 73-11-10-400-802).
1 If the ECAM warning "FUEL FILTER CLOG" or "ENGINE X FUEL FILTER DEGRAD" did not come into view:
a After 24 hours in service, examine and replace the fuel filter cartridge (3) element (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).
2 If the ECAM warning "FUEL FILTER CLOG" or "ENGINE X FUEL FILTER DEGRAD" came into view:
a Do a borescope inspection of the combustion chamber liners and High Pressure Turbine (HPT) nozzle (Ref. AMM TASK 72-40-00-290-801):

If borescope findings are unserviceable, remove the engine.
If borescope findings are within limits, repeat the borescope inspection as above after 100 hours of engine operation.
If the borescope findings did not change since last inspection, resume normal inspection schedule.
If the borescope findings are unserviceable, remove the engine.
If the borescope findings show a deviation since last inspection but are still within the limits:
. Replace all fuel nozzles (Ref. AMM TASK 73-11-30-000-802) and (Ref. AMM TASK 73-11-30-400-802).
. Replace the fuel nozzle manifold.
. Drain all disconnected fuel lines and blow dry air inside to remove any contaminant that could be left.

3 After 24 hours in service, examine and replace the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).
(3) Contamination by black sludge or slimy materials (biological contamination):

NOTE: Fungus growth can cause this contamination.

(a) Replace the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).
(b) Do a check of the fuel filter on the opposite engine.
1 Removal of the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802).
2 Fuel filter cartridge (3) inspection (Ref. AMM TASK 73-11-10-210-802).
3 Installation of the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-400-802).
(c) If it is found contaminated, check the fuel tank for contamination and follow the recommendations included (Ref. AMM TASK 12-32-28-281-003).
(d) After 24 hours in service, examine and replace the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).

CAUTION: THIS KIND OF CONTAMINATION CAN POTENTIALLY PARTIALLY OR TOTALLY CLOG THE ENGINE FUEL NOZZLES THUS LEADING TO AN ABNORMAL FUEL SPRAY AND CONSEQUENTLY CAUSE EXTENSIVE ENGINE HARDWARE DAMAGE. THE FOLLOWING TROUBLESHOOTING SHALL BE STRICTLY APPLIED TO AVOID FURTHER ENGINE DAMAGE.

(4) Contamination by bronze particles:

Examination of the Fuel Filter Cartridge for Contamination

NOTE: Evidence of bronze particles in the main fuel filter cartridge (3) is indicative of a main fuel pump HP bearing failure.

(a) If ECAM Warning "ENG X FUEL FILTER DEGRAD" then replace the main fuel pump and perform fuel strainer inspection.
1 Remove the main fuel pump (Ref. AMM TASK 73-11-05-000-801).
2 Install the main fuel pump (Ref. AMM TASK 73-11-05-400-801).
3 Inspect the fuel strainer (Ref. AMM TASK 73-11-15-200-801).
(b) If ECAM Warning "ENG X FUEL FILTER CLOG" then perform the following:
1 Do a borescope inspection of the combustion chamber liners and HPT nozzle (Ref. AMM TASK 72-40-00-290-801).
a If the borescope inspection findings are unserviceable, remove the engine.
b If the results of the borescope inspection findings are in the specified limits, replace the engine fuel system components which follow:

NOTE: When components are disconnected, their tubes must be fully drained and blown with dry air to remove any bronze particles left.

c Replace the fuel nozzles (Ref. AMM TASK 73-11-30-000-802) and (Ref. AMM TASK 73-11-30-400-802).
d Replace the split control unit and servo valve assembly (Ref. AMM TASK 73-21-10-000-802) and (Ref. AMM TASK 73-21-10-400-802).
e Replace the FMU (Ref. AMM TASK 73-21-05-000-802) and (Ref. AMM TASK 73-21-05-400-802).
f Replace the fuel pump (Ref. AMM TASK 73-11-05-000-801) and (Ref. AMM TASK 73-11-05-400-801).
g Remove the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802).
h Install the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-400-802).
i Replace the fuel flow transmitter (Ref. AMM TASK 73-31-10-000-802) and (Ref. AMM TASK 73-31-10-400-802).
j Replace the servo fuel heater (Ref. AMM TASK 73-11-20-000-802) and (Ref. AMM TASK 73-11-20-400-802).
k Replace the main oil/fuel heat exchanger (Ref. AMM TASK 79-21-25-000-801) and (Ref. AMM TASK 79-21-25-400-801).
l Replace the integrated drive generator oil cooler (Ref. AMM TASK 73-11-50-000-802) and (Ref. AMM TASK 73-11-50-400-802).
m Replace the fuel return valve (Ref. AMM TASK 73-11-35-000-801) and (Ref. AMM TASK 73-11-35-400-801).
n Do a check of the fuel filter cartridge (3) on the opposite engine.

Removal of the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802).
Fuel filter inspection (Ref. AMM TASK 73-11-10-210-802).
Fuel strainer cleaning (Ref. AMM TASK 73-11-15-100-801).
Installation of the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-400-802).

o Do a check of the aircraft fuel tanks and clean them (Ref. AMM TASK 28-11-00-100-001).
p After 24 hours in service, examine and replace the fuel filter cartridge (3) (Ref. AMM TASK 73-11-10-000-802) and (Ref. AMM TASK 73-11-10-400-802).

5. Close-up
Subtask 73-11-10-410-069-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:03:56 UTC