DOC AIRBUS | TSM A320FElevated Oil Consumption on Engine 1
1. Possible Causes
CAUTION: FAST OIL LOSS CAN CAUSE OIL IGNITION INCIDENTS AND/OR LARGE DAMAGE TO THE
ENGINE. IF THE CAUSE OF THE ELEVATED OIL CONSUMPTION CANNOT BE CORRECTED,
REMOVE THE ENGINE FROM SERVICE.
· ENGINE-1 ( 1000EM1 )
· De-oiler housing
· De-oiler seal
· De-oiler breather tube
· Blind cap seal
· Air-cooled oil cooler
· Chip detector seals
· No 4 scavenge tube gasket
· Oil scavenge pump
· Fuel cooled oil cooler
· Gearbox seal drains
· No.5 bearing compartment seal
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 71-00-00-710-012 Test No.3 : Idle Leak Check
Ref. AMM 71-00-20-000-040 Removal of the Power Plant
Ref. AMM 71-00-20-400-040 Installation of the Power Plant
Ref. AMM 72-00-00-200-016 Inspection of the HP Compressor
Ref. AMM 72-38-11-000-010 Removal of the Inlet Cone
Ref. AMM 72-50-00-200-010 Inspection of the Turbine Exhaust Case
Ref. AMM 72-50-50-100-010 Cleaning of N°5 Bearing Oil Service Lines, Filter and Oil Jet
Ref. AMM 72-51-41-000-010 Removal of the No.5 Bearing Compartment Cover (PRE SBE 72-0063)
Ref. AMM 72-51-41-000-011 Removal of the No.5 Bearing Compartment Cover (POST SBE
72-0063)
Ref. AMM 72-51-41-000-012 Removal of the Low Pressure (LP) Turbine Shaft Blind Cap
Ref. AMM 72-51-41-400-010 Installation of the No.5 Bearing Compartment Cover
Ref. AMM 72-51-41-400-012 Installation of the Low Pressure (LP) Turbine Shaft Blind Cap
Ref. AMM 72-60-31-000-010 Removal of the Seal Assembly
Ref. AMM 72-60-31-400-010 Installation of the Seal Assembly
Ref. AMM 72-61-49-000-010 Removal of the Gearbox Breather Outlet Duct (GBOD)
Ref. AMM 72-61-49-400-010 Installation of the Gearbox Breather Outlet Duct (GBOD)
Ref. AMM 79-00-00-200-011 Inspection of the Magnetic Chip Detectors for Debris
Ref. AMM 79-00-00-200-012 Inspection of the Oil Filters
Ref. AMM 79-20-00-200-010 General Visual Inspection of the Oil Distribution System Components,
Tubes and Joints
Ref. AMM 79-21-42-000-010 Removal of the Air Cooled Oil Cooler
Ref. AMM 79-21-42-400-010 Installation of the Air Cooled Oil Cooler
Ref. AMM 79-21-43-000-010 Removal of the Fuel Cooled Oil Cooler
Ref. AMM 79-21-43-200-010 Inspection of the Fuel Cooled Oil Cooler for Internal Leakage
Ref. AMM 79-21-43-400-010 Installation of the Fuel Cooled Oil Cooler
Ref. AMM 79-22-41-000-010 Removal of the Scavenge Oil Pump
Ref. AMM 79-22-41-400-010 Installation of the Scavenge Oil Pump
Ref. AMM 79-22-45-000-010 Removal of the Magnetic Chip Detector
Ref. AMM 79-22-45-400-010 Installation of the Magnetic Chip Detector
Ref. AMM 79-23-51-000-010 Removal of the No. 4 Bearing Compartment Scavenge Valve
Ref. AMM 79-23-51-400-010 Installation of the No. 4 Bearing Compartment Scavenge Valve
Elevated Oil Consumption on Engine 1(2)
Figure 79(IAE)-00-00-991-00100-A / SHEET 1/3 - Elevated Oil Consumption on Engine 1(2) not
printed, as per printing preferences
Figure 79(IAE)-00-00-991-00100-A / SHEET 2/3 - Elevated Oil Consumption on Engine 1(2) not
printed, as per printing preferences
Figure 79(IAE)-00-00-991-00100-A / SHEET 3/3 - Elevated Oil Consumption on Engine 1(2) not
printed, as per printing preferences
3. Fault Confirmation
Subtask 79-00-00-710-118-A
A. Test
(1) Not applicable.
4. Fault Isolation
(Ref. Fig. Elevated Oil Consumption on Engine 1(2))
Subtask 79-00-00-810-102-A
A. Do a check for oil consumption of more than 0.3 US Qts/hr (0.6 pt/hr).
· If oil consumption is not more than 0.3 US Qts/hr (0.6 pt/hr):
continue in service.
· If the oil consumption is more than 0.3 US Qts/hr (0.6 pt/hr):
(1) Do a check of the magnetic chip detectors Ref. AMM 79-00-00-200-011 for contamination:
(a) If there is no contamination of the magnetic chip detectors, continue to step (2).
(b) If there is contamination of the magnetic chip detectors, make an analysis of the debris Ref.
AMM 79-00-00-200-011 (Examine the debris on the MCD with a magnifying glass power 05x)
1 If debris are in the limits, continue to step (2).
2 If the debris are not in the limits, remove the ENGINE-1 ( 1000EM1 ) from service Ref.
AMM 71-00-20-000-040 and Ref. AMM 71-00-20-400-040 .
(2) Do a check of the oil filters Ref. AMM 79-00-00-200-012 for contamination:
(a) If there is no contamination of oil filters, continue to step (3).
(b) If there is contamination of oil filters, make an analysis of the debris Ref. AMM 79-00-00-200-012
(Examine the debris from the filters).
1 If debris are in the limits, continue to step (3).
2 If debris are not in the limits, remove the ENGINE-1 ( 1000EM1 ) from service Ref.
AMM 71-00-20-000-040 and Ref. AMM 71-00-20-400-040 .
(3) Do an inspection of the Turbine Exhaust Case (TEC) for signs of leakage from the weep hole Ref.
AMM 72-50-00-200-010 .
(a) If there are signs of oil leakage from the weep hole:
· Remove the ENGINE-1 ( 1000EM1 ) from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
(b) If there are no signs of oil leakage from the weep hole, continue to step (4).
(4) Do a check of the oil system externals for signs of leakage to include gearbox seal drains and engine
cowl at breather exit for wetness Ref. AMM 79-20-00-200-010 .
(a) If there are signs of oil:
· Repair leaks on common sources:
. De-oiler housing Ref. AMM 72-60-31-000-010 and Ref.
AMM 72-60-31-400-010
. De-oiler seal Ref. AMM 72-60-31-000-010 and Ref.
AMM 72-60-31-400-010
. De-oiler breather tube Ref. AMM 72-61-49-000-010 and Ref.
AMM 72-61-49-400-010
. Blind cap seal Ref. AMM 72-51-41-000-012 and Ref.
AMM 72-51-41-400-012
. Air-cooled oil cooler Ref. AMM 79-21-42-000-010 and Ref.
AMM 79-21-42-400-010
. Chip detector seals Ref. AMM 79-22-45-000-010 and Ref.
AMM 79-22-45-400-010
. Loose connections at bifurcation panel
. No 4 scavenge tube gasket Ref. AMM 79-23-51-000-010 and Ref.
AMM 79-23-51-400-010
. Oil scavenge pump Ref. AMM 79-22-41-000-010 and Ref.
AMM 79-22-41-400-010
. Fuel cooled oil cooler Ref. AMM 79-21-43-000-010 and Ref.
AMM 79-21-43-400-010
. Gearbox seal drains .
· Continue to step (9).
(b) If there is no sign of oil, continue to step (5).
(5) Do a borescope inspection (BSI) for oil in compressor gas path, 2.5 bleed exit, fan exit case or fan
splitter Ref. AMM 72-00-00-200-016 .
(a) If there is oil:
· Remove the ENGINE-1 ( 1000EM1 ) from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
(b) If there is no oil, continue to step (6).
(6) Do an internal check of the LP shaft for signs of oil leakage by removing inlet cone Ref.
AMM 72-38-11-000-010 .
(a) If there is oil leakage
· Replace the LP shaft blind cap seal at no 5 bearing compartment Ref. AMM 72-51-41-000-012
and Ref. AMM 72-51-41-400-012 .
· Clean No.5 compartment, if necessary Ref. AMM 72-50-50-100-010 .
(b) If there is no oil leakage, continue to step (7).
(7) Do a check of the No.5 bearing compartment.
(a) If the Turbine Exhaust Case (TEC) cover is not externally dry and clean Ref.
AMM 72-50-00-200-010 :
· Replace the No.5 bearing compartment seal Ref. AMM 72-51-41-000-010 Ref.
AMM 72-51-41-000-011 Ref. AMM 72-51-41-400-010 .
· Examine the No.5 bearing compartment and oil service tubes for coke (SBE 72-0461).
· Clean No.5 bearing compartment, if necessary Ref. AMM 72-50-50-100-010 .
(b) If the TEC cover is externally dry and clean, continue to step (8).
(8) Do an inspection of the fuel cooled oil cooler (FCOC) for internal leakage Ref.
AMM 79-21-43-200-010 .
(9) Do an engine idle check Ref. AMM 71-00-00-710-012 , Test No. 3 for 10 minutes and do a check of
the oil system, gearbox seal drains and turbine exhaust case Ref. AMM 72-50-00-200-010 for signs
of leakage.
(a) If source of external oil leak is repaired, return the engine to service and monitor oil consumption
on subsequent flights.
1 If oil consumption is in the limits, return the engine to normal service.
2 If oil consumption is not in the limits, remove the ENGINE-1 ( 1000EM1 ) from service Ref.
AMM 71-00-20-000-040 and Ref. AMM 71-00-20-400-040 .
(b) If source of external leak is not identified, remove the ENGINE-1 ( 1000EM1 ) from service Ref.
AMM 71-00-20-000-040 Ref. AMM 71-00-20-400-040 .
Subtask 79-00-00-710-119-A
B. After the subsequent flight, make sure that the fault does not continue. [Rev.6 from Feb 2017] 2026.04.04 04:38:25 UTC