Oil Filter Clogged on Engine 1

TASK 79-00-00-810-820-A
Oil Filter Clogged on Engine 1

1. Possible Causes

oil scavenge filter element
engine
SW-OIL FILTER DIFF PRESS [4001EN]
aircraft wiring
main oil supply filter

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-004	Engine Manual Start
AMM 71-00-00-710-006	Minimum Idle Check
AMM 71-00-00-710-028	Engine Shutdown
AMM 79-00-00-281-002	Check of the Electrical Master Chip Detector (EMCD) for Particles
AMM 79-00-00-281-003	Check of FWD Sump, AFT Sump, AGB, and TGB Scavenge Screens
AMM 79-21-10-000-003	Removal of the Lube Supply and/or Common Scavenge Filters
AMM 79-21-10-210-001	Check Supply and Scavenge Filters Clogging Indicator Position
AMM 79-21-10-210-002	Check of the Lubrication Unit Magnetic Plugs and Scavenge Screens
AMM 79-21-10-400-003	Installation of the Lube Supply and/or Common Scavenge Filters
AMM 79-21-10-920-002	Remove and Discard Supply Filter
AMM 79-35-15-000-003	Removal of the Oil Filter Differential Pressure Switch
AMM 79-35-15-000-040	Removal of the Oil Filter Differential Pressure Switch
AMM 79-35-15-400-003	Installation of the Oil Filter Differential Pressure Switch
AMM 79-35-15-400-040	Installation of the Oil Filter Differential Pressure Switch

3. Fault Confirmation
Subtask 79-00-00-710-088-A ** ON A/C NOT FOR ALL

A. Test
(1) Start the engine 1 by the normal engine automatic start procedure AMM 71-00-00-710-003 or the normal engine manual start procedure AMM 71-00-00-710-004.
(2) When the oil temperature is more than 40 deg. C (104 deg. F) and the engine is at stabilised idle conditions, check if the ENG OIL FILTER CLOG indication is displayed on the ENGINE page lower display unit.

NOTE: If the warning is triggered temporarily during engine start with low engine oil temperature (lower than 40 deg. C or 104 deg. F) no maintenance action is required. Check for correct operation after the next start with oil temperature above 40 deg. C (104 deg. F).

(3) Do a shutdown of the engine 1 AMM 71-00-00-710-028.

4. Fault Isolation
Subtask 79-00-00-810-076-A ** ON A/C NOT FOR ALL

A. The ECAM warning is triggered if a clogging of the oil scavenge filter element is detected.

NOTE: If the warning is triggered temporarily during engine start with low engine oil temperature (lower than 40 deg.C (104 deg.F)), no maintenance action is required. Check for correct operation after next start with oil temperature above 40 deg.C (104 deg.F).

(1) Do the following checks:

do a check of the lubrication unit magnetic plugs and screens AMM 79-21-10-210-002,
do a check of the lube supply and common scavenge filters clogging indicators AMM 79-21-10-210-001.

(2) Remove and replace both the oil supply and the oil scavenge filter elements AMM 79-21-10-000-003 and AMM 79-21-10-400-003.
(3) If the fault continues:

replace the SW-OIL FILTER DIFF PRESS [4001EN] AMM 79-35-15-000-040 and AMM 79-35-15-400-040.

(4) If the fault continues:
(a) Do a check of the aircraft wiring between the oil filter differential pressure switch (4001EN) and SDAC1/SDAC2 for short to ground:

repair or replace the wiring as required.
if the fault continues contact CFM PSE for further inspection recommendation.

Subtask 79-00-00-810-076-B ** ON A/C NOT FOR ALL

A. The ECAM warning is triggered if a clogging of the main oil supply filter is detected.

(1) Do the following checks:

Do a check of the Electrical Master Chip Detector for particles AMM 79-00-00-281-002,
Do a check of FWD, AFT Sump, AGB, and TGB scavenge screens AMM 79-00-00-281-003.

(2) Remove and replace the main oil supply filter AMM 79-21-10-920-002.
(3) If the fault continues:

Replace the SW-OIL FILTER DIFF PRESS [4001EN] AMM 79-35-15-000-003 and AMM 79-35-15-400-003.

(4) If the fault continues:
(a) Do a check of the aircraft wiring between the oil filter differential pressure switch (4001EN) and SDAC1/SDAC2 for short to ground:

Repair or replace the wiring as required.
If the fault continues contact CFM PSE for further inspection recommendation.

Subtask 79-00-00-710-089-A ** ON A/C NOT FOR ALL

B. Do a minimum idle leak check AMM 71-00-00-710-006.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.

[Rev.8 from Aug 2018] 2026.04.04 04:38:22 UTC