Troubleshoot the Engine after a High Oil Consumption event

TASK 71-00-00-810-846-A
Troubleshoot the Engine after a High Oil Consumption event

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-847-A	Troubleshoot the Engine after a Smoke and/or Oil Fumes in the Cabin event
TSM TASK 71-00-00-810-848-A	Troubleshoot the Engine after an Oil Leak fron Drain Mast event
TSM TASK 79-31-21-810-801-A	Oil Level Sensor Electrical Failure (Single Sensor only in Channel B)
AMM 71-00-00-720-811	Test No. 3 - Idle Power Test
AMM 72-00-00-210-811	Inspection of the Engine after Engine Oil Overtemperature
AMM 72-31-00-290-802	Borescope Inspection of the Low Pressure Compressor (LPC) Assembly
AMM 72-35-00-290-801	Borescope Inspection of the High Pressure Compressor (HPC) Assembly
AMM 73-21-00-710-806	Test No.7 - EEC Operation Test (Self Test)
AMM 79-00-00-210-808	Oil Consumption Monitoring
AMM 79-00-00-210-810	Visual Inspection of the Engine Oil System
AMM 79-00-00-610-801	Check and Fill the Engine Oil

3. Fault Confirmation
Subtask 71-00-00-710-103-A ** ON A/C NOT FOR ALL

A. Investigate the Engine After a High Oil Consumption event
(1) Use this troubleshooting procedure to investigate the engine after high oil consumption event.

NOTE: Use the instruction in the procedure fill the engine with oil AMM 79-00-00-610-801 to examine the oil level. If you do not, the oil level sightglass indication will not be accurate.

NOTE: The amount of oil that is distributed in the oil system during engine operation and returned to the oil tank at shutdown is referred to as oil gulp. Oil gulp for this engine can be as much as 10.1 quarts (9.6 liters) leaving 4.8 quarts (4.5 liters) of useable oil in the tank.

(2) Examine the maintenance history to make sure that there is a high oil consumption problem. Refer to oil consumption monitoring AMM 79-00-00-210-808.
(3) Using the Multipurpose Control and Display Unit (MCDU) test the FADEC system for any recorded faults. Refer to do the EEC system interactive test AMM 73-21-00-710-806.
(4) Any EEC monitored faults are transmitted to the aircraft Centralized Fault Display Interface Unit (CFDIU). The MCDU allows interactive dialog with the EEC. Use the MCDU to review the previous flight leg fault information, scheduled maintenance fault information and ground fault information. If there are any faults reported troubleshoot them first.
(5) If oil fumes in the cabin are reported and the cause is determined to be engine related, remove the engine from service.

NOTE: In most cases fumes in the cabin are caused by contamination of the aircraft pneumatic system. The pneumatic system (ATA 36) supplies air to the air conditioning system (ATA 21) and can be contaminated by the APU or the engine. Make sure that you rule out other sources of smoke or fumes before replacing the engine, refer to (Ref. TSM TASK 71-00-00-810-847).

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 71-00-00-810-111-A ** ON A/C NOT FOR ALL

A. Do the steps that follow:
(1) If there is a report of engine oil temperature high, refer to do an inspection of the engine (after engine oil over temperature) AMM 72-00-00-210-811.
(2) If the Crew Alert message ENGXB-0584-OIL LVL SNSR ELEC FAIL appears refer to and AMBER Crosses appear on the Oil Quantity display refer to (Ref. TSM TASK 79-31-21-810-801).
(3) Look to see if one or more of the fault messages are set were set on either engine within the past 10 flights: ENGXD-0235-BUFFER AIR SHUTOFF VLV FAIL CLSD, ENGXD-0237-BUFFER AIR SHUTOFF VLV FAIL OPEN, ENGXD-0239-BUFFER AIR CHECK VLV FAIL OPEN, and ENGXD-0241-BUFFER AIR CHECK VLV FAIL CLSD
(a) If one or more of the fault messages were set, inspect the HPC AMM 72-35-00-290-801. Be sure to look at the 2nd Stage HPC IBR rub strip at the 6 o'clock position for signs of oil contamination. (1) If there is evidence of oil contamination remove the engine from service. (2) If no problems were found go to the next step.
(b) Inspect the LPC AMM 72-31-00-290-802. (1) If there is evidence of oil contamination remove the engine from service.
(c) If none of the fault messages were set or the HPC and LPC Borescope Inspections were OK, go to the next step.
(4) Do an inspection of the engine for external oil leaks AMM 79-00-00-210-808.
(5) If you do not find any evidence of leakage, use a flashlight to inspect the aft portion of the fan blade platforms and the inlet of the Fan Intermediate Case (forward of the Fan Exit Stators) for oil wetting.
(a) A. If there is evidence of oil wetting, remove the engine from service.
(6) If no problems were found, do a visual inspection of the engine oil system AMM 79-00-00-210-810.
(a) Run the engine to idle, shutdown and inspect for oil leaks. If you cannot find an oil system leak by this inspection, inspect the oil system for leaks AMM 71-00-00-720-811.
(7) If you do not find any evidence of leakage do a visual inspection of the Drain Mast (Ref. TSM TASK 71-00-00-810-848).
(8) If you do not find any problems and you cannot determine the cause for oil consumption service the oil Tank AMM 79-00-00-610-801.
(a) The aircraft may be dispatched based on the engine's known oil consumption rate.

5. Close-up
Subtask 71-00-00-860-058-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.

[Rev.8 from Aug 2018] 2026.04.04 04:35:03 UTC