Fuel Filter Assembly Blocage of Filter Element

TASK 73-11-00-810-822-A
Fuel Filter Assembly Blocage of Filter Element

1. Possible Causes

FUEL FILTER DIFF PRESS SENSOR [4002KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-834-A	General Troubleshooting Guidelines for Additional Troubleshooting Information
TSM TASK 71-00-00-810-835-A	Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
TSM TASK 73-34-00-810-806-A	Fuel Filter Delta Pressure Sensor Electrical Failure Channel B
TSM TASK 73-34-00-810-807-A	Fuel Filter Delta Pressure Sensor Electrical Failure Channel A
AMM 73-11-00-210-804	General Visual Inspection (GVI) of the Fuel Distribution System
AMM 73-11-00-281-801	Inspection of the Fuel Filter Element for Contamination
AMM 73-11-06-000-801	Removal of the Fuel Filter Element
AMM 73-11-06-400-801	Installation of the Fuel Filter Element
AMM 73-21-00-710-807	Test No.6 - EEC Operation Test (Idle Test)
AMM 73-34-21-000-801	Removal of the Fuel Filter Differential Pressure Sensor
AMM 73-34-21-400-801	Installation of the Fuel Filter Differential Pressure Sensor
AMM 78-36-00-010-802	Opening of the Thrust Reverser Cowl-Doors
AMM 78-36-00-410-802	Closing of the Thrust Reverser Cowl-Doors

3. Fault Confirmation
Subtask 73-11-00-710-075-A ** ON A/C NOT FOR ALL

A. Not Applicable

NOTE: The Electronic Engine Control (EEC) has sensed that the pressure drop across the fuel filter differential pressure sensor is large enough to indicate that the fuel filter is approaching a clogged condition. The fuel filter is located inside the fuel filter housing on the fuel manifold at the 4 o'clock position.

Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

WARNING: REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

Subtask 73-11-00-810-071-A ** ON A/C NOT FOR ALL

A. Do as follows:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Remove the fuel filter AMM 73-11-06-000-801.
(3) Inspect the fuel filter for contamination AMM 73-11-00-281-801 and AMM 73-11-00-210-804.
(a) If the fuel filter is contaminated, correct the cause of contamination.
1 Install a new fuel filter AMM 73-11-06-400-801.
2 Do the test given in Para. 4.B.
(b) If the fault continues, do a check for faults related to the fuel filter differential pressure sensor.
1 Do a check for maintenance messages regarding an out of range or rate fuel filter differential pressure sensor.
a For maintenance message on channel A, refer to (Ref. TSM TASK 73-34-00-810-807).
b For maintenance message on channel B, refer to (Ref. TSM TASK 73-34-00-810-806).
2 If fuel filter differential pressure sensor faults are not present, the sensor output may have drifted or failed in range.
a Replace FUEL FILTER DIFF PRESS SENSOR [4002KS] AMM 73-34-21-000-801 and AMM 73-34-21-400-801.
b Do the test given in Para. 4.B.

Subtask 73-11-00-710-076-A ** ON A/C NOT FOR ALL

B. Repair Confirmation
(1) Do the FADEC system idle test AMM 73-21-00-710-807.

5. Close-up
Subtask 73-11-00-860-071-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:40:43 UTC