DOC AIRBUS | AMM A320FInspection of the Oil Filters [IAE]
TASK 79-00-00-200-012-A
Inspection of the Oil Filters
This task gives instructions on how to check the debris found in the pressure and scavenge oil filters. A description of the types of debris is also given.
The debris that is found can give an indication that failure of a component could occur in a short time.
It is recommended that records are kept of all debris found in the filters.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 79-00-00-941-061-A ** ON A/C NOT FOR ALL
Subtask 79-00-00-210-071-A ** ON A/C NOT FOR ALL
Subtask 79-00-00-410-061-A ** ON A/C NOT FOR ALL Subtask 79-00-00-942-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:40:00 UTC
Inspection of the Oil Filters
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING:
DO NOT LET ENGINE OIL STAY ON YOUR SKIN FOR A LONG TIME. FLUSH THE OIL FROM YOUR SKIN WITH WATER. THE OIL IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY.
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.
CAUTION:
DO NOT LET ENGINE FUEL OR OIL FALL ON THE ENGINE. UNWANTED FUEL OR OIL MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FUEL OR OIL CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.
1. Reason for the JobThis task gives instructions on how to check the debris found in the pressure and scavenge oil filters. A description of the types of debris is also given.
The debris that is found can give an indication that failure of a component could occur in a short time.
It is recommended that records are kept of all debris found in the filters.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CONTAINER 1L (0.26 USGAL) MINIMUM - POLYTHENE |
| No specific | AR | MAGNET - BAR, SMALL |
| No specific | AR | MAGNIFYING GLASS POWER 20X |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-277) | Kerosine |
| (Material No.V02-011) | filter paper |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 79-21-44-000-010-A | Removal of the Pressure Oil Filter Element |
| TASK 79-21-44-400-010-A | Installation of the Pressure Oil Filter Element |
| TASK 79-22-44-000-010-A | Removal of the Scavenge Oil Filter Element |
| TASK 79-22-44-400-010-A | Installation of the Scavenge Oil Filter Element |
Subtask 79-00-00-941-061-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
4. Procedure(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 79-00-00-210-071-A ** ON A/C NOT FOR ALL
A. General.
(1) The debris must be examined with a binocular microscope of up to 20 times magnification.
Subtask 79-00-00-210-072-A ** ON A/C NOT FOR ALL (1) The debris must be examined with a binocular microscope of up to 20 times magnification.
NOTE: If a binocular microscope is not available a 20 times magnification magnifying glass can be used.
(2) If the engine or external gearbox are rejected, the debris from the filters must be sent with the component to the overhaul shop. B. Types of Debris.
(1) There are five main types of debris found in the filters. They are: build debris, magnetic fines, metallic flakes, chips and gear tooth fragments.
(a) Build Debris
This is unwanted material that is accidentally left in the engine when it is assembled. The build debris comes from machine operations when the components are made. When this material is broken it can look the same as gear or steel seal material.
(b) Magnetic fines.
These are very small steel particles which show as a black sludge in the filter. When the oil is removed they show as dull hair like slivers. Fines come from permitted engine wear.
Bearing skid can also make fines, but the increased quantity will show during the analysis of filter samples.
(c) Metallic flakes.
Metallic flakes come from these components; ball bearing, roller bearing and gear teeth. Flakes that have an irregular shape must be examined to find their origin.
1 Ball bearing and ball bearing track flakes are usually almost circular with radial cracks. When the flake is clean, the shiny side is much brighter than other types of flake. The shiny side is also has small scratches which go across each other.
2 Roller bearing and roller bearing track flakes are usually almost rectangular in shape. When the flake is clean, the shiny side is much brighter than other types of flake. The shiny side has small scratches which go accross each other.
3 Gear teeth flakes are shiny with an irregular shape. They are usually thicker and not as bright as ball or roller bearing flakes.
(d) Chips.
These are very thick flakes or pieces of metal which usually have one smooth machined surface.
(e) Gear tooth fragments.
These are the corner pieces of gear teeth and may show that the gears are notcorrectly aligned.
Subtask 79-00-00-010-061-A ** ON A/C NOT FOR ALL Subtask 79-00-00-110-051-A ** ON A/C NOT FOR ALL (1) There are five main types of debris found in the filters. They are: build debris, magnetic fines, metallic flakes, chips and gear tooth fragments.
(a) Build Debris
This is unwanted material that is accidentally left in the engine when it is assembled. The build debris comes from machine operations when the components are made. When this material is broken it can look the same as gear or steel seal material.
(b) Magnetic fines.
These are very small steel particles which show as a black sludge in the filter. When the oil is removed they show as dull hair like slivers. Fines come from permitted engine wear.
Bearing skid can also make fines, but the increased quantity will show during the analysis of filter samples.
(c) Metallic flakes.
Metallic flakes come from these components; ball bearing, roller bearing and gear teeth. Flakes that have an irregular shape must be examined to find their origin.
1 Ball bearing and ball bearing track flakes are usually almost circular with radial cracks. When the flake is clean, the shiny side is much brighter than other types of flake. The shiny side is also has small scratches which go across each other.
2 Roller bearing and roller bearing track flakes are usually almost rectangular in shape. When the flake is clean, the shiny side is much brighter than other types of flake. The shiny side has small scratches which go accross each other.
3 Gear teeth flakes are shiny with an irregular shape. They are usually thicker and not as bright as ball or roller bearing flakes.
(d) Chips.
These are very thick flakes or pieces of metal which usually have one smooth machined surface.
(e) Gear tooth fragments.
These are the corner pieces of gear teeth and may show that the gears are notcorrectly aligned.
D. Remove the debris from the pressure oil filter
(1) Remove the pressure oil filter element (Ref. AMM TASK 79-21-44-000-010). Collect the oil that drains from the filter in a clean CONTAINER 1L (0.26 USGAL) MINIMUM - POLYTHENE
(2) Put the drained oil through a new filter paper (Material No.V02-011) to remove the ferrous and non ferrous debris.
(3) Clean the filter element and cover in Kerosine (Material No.V01-277) in a clean container.
(4) Put the kerosine through the filter paper to remove the debris.
(5) Move a MAGNET - BAR, SMALL, covered in tissue, above the debris to remove the ferrous material.
Subtask 79-00-00-110-052-A ** ON A/C NOT FOR ALL (1) Remove the pressure oil filter element (Ref. AMM TASK 79-21-44-000-010). Collect the oil that drains from the filter in a clean CONTAINER 1L (0.26 USGAL) MINIMUM - POLYTHENE
(2) Put the drained oil through a new filter paper (Material No.V02-011) to remove the ferrous and non ferrous debris.
(3) Clean the filter element and cover in Kerosine (Material No.V01-277) in a clean container.
(4) Put the kerosine through the filter paper to remove the debris.
(5) Move a MAGNET - BAR, SMALL, covered in tissue, above the debris to remove the ferrous material.
E. Remove the debris from the scavenge oil filter
(1) Remove the filter element (Ref. AMM TASK 79-22-44-000-010). Collect the oil that drains from the filter in a clean CONTAINER 1L (0.26 USGAL) MINIMUM - POLYTHENE.
(2) Clean the filter element and filter canister cover in Kerosine (Material No.V01-277) in the same container as the oil drained from filter element.
(3) Put the oil/kerosene mixture drained through a new filter paper (Material No.V02-011) to remove the ferrous and non ferrous debris.
(4) Move a MAGNET - BAR, SMALL, covered in tissue, above the debris to remove the ferrous material.
Subtask 79-00-00-210-066-A ** ON A/C NOT FOR ALL (1) Remove the filter element (Ref. AMM TASK 79-22-44-000-010). Collect the oil that drains from the filter in a clean CONTAINER 1L (0.26 USGAL) MINIMUM - POLYTHENE.
(2) Clean the filter element and filter canister cover in Kerosine (Material No.V01-277) in the same container as the oil drained from filter element.
(3) Put the oil/kerosene mixture drained through a new filter paper (Material No.V02-011) to remove the ferrous and non ferrous debris.
(4) Move a MAGNET - BAR, SMALL, covered in tissue, above the debris to remove the ferrous material.
F. Examine the debris from the filters
(1) Light alloy or silver
(a) Accept light alloy or silver that fill an area of up to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square.
(b) If the light alloy or silver fill an area larger than to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square, reject the engine.
(2) Fines
(a) Accept fines that fill an area of up to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square.
(b) If the fines fill an area larger than to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square, reject the engine.
(c) If the fines are identified as Jethete, material code E.A.D.; replace the intermediate case module at the next shop visit.
(3) Larger particles of steel (flakes, chips or gear tooth fragments), bronze or aluminium.
(a) If larger particles of steel ball bearing or roller bearing flakes, bronze or aluminium are found; reject the engine.
(4) Fine particles or bronze or aluminium
(a) Accept if the particles are found in the scavenge filter.
(5) Build Debris
(a) Accept build debris found in the filters.
Subtask 79-00-00-210-067-A ** ON A/C NOT FOR ALL (1) Light alloy or silver
(a) Accept light alloy or silver that fill an area of up to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square.
(b) If the light alloy or silver fill an area larger than to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square, reject the engine.
(2) Fines
(a) Accept fines that fill an area of up to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square.
(b) If the fines fill an area larger than to 0.25 sqin. (161.3 Sq mm) 0.5 in. (12.7 mm) side square, reject the engine.
(c) If the fines are identified as Jethete, material code E.A.D.; replace the intermediate case module at the next shop visit.
(3) Larger particles of steel (flakes, chips or gear tooth fragments), bronze or aluminium.
(a) If larger particles of steel ball bearing or roller bearing flakes, bronze or aluminium are found; reject the engine.
(4) Fine particles or bronze or aluminium
(a) Accept if the particles are found in the scavenge filter.
(5) Build Debris
(a) Accept build debris found in the filters.
G. Examine the filter elements with a MAGNIFYING GLASS POWER 20X and a light source
(1) If carbon deposits are found; replace the filters.
Subtask 79-00-00-420-052-A ** ON A/C NOT FOR ALL (1) If carbon deposits are found; replace the filters.
NOTE: The pressure oil filter element is of the type that can be cleaned.
NOTE: The scavenge oil filter element cannot be cleaned and must be discarded if carbon is found.
H. Install the pressure and scavenge oil filter elements (Ref. AMM TASK 79-21-44-400-010) (Ref. AMM TASK 79-22-44-400-010).
5. Close-upSubtask 79-00-00-410-061-A ** ON A/C NOT FOR ALL Subtask 79-00-00-942-054-A ** ON A/C NOT FOR ALL
B. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).