Smoke from Front or Exhaust of Engine 2

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1. Possible Causes
· De-oiler housing
· De-oiler carbon seal
· De-oiler breather tube
· Blind cap seal
· Air-cooled oil cooler
· Chip detector seals
· Loose connections at bifurcation panel
· No. 4 scavenge tube gasket
· Oil scavenge pump
· Fuel cooled oil cooler
· Gearbox seal drains
· de-oiler carbon seal
· oil scavenge pump
· oil pressure pump
· No. 5 bearing compartment seal
· Fuel Distribution Valve (FDV)
· Fuel Metering Unit (FMU)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
79-00-00-810-839-A Elevated Oil Consumption on Engine 2
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 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 72-00-00-200-013 Borescope Inspection of inside of Combustion Chamber and HP turbine
stage 1 Vanes
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 72-51-41-000-012 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 73-10-00-200-010 General Visual Inspection of the Fuel Distribution System Components,
Manifolds Tubes and Joints
Ref. AMM 73-13-43-000-010 Removal of the Fuel Distribution Valve
Ref. AMM 73-13-43-400-010 Installation of the Fuel Distribution Valve
Ref. AMM 73-22-52-000-010 Removal of the Fuel Metering Unit (FMU)
Ref. AMM 73-22-52-400-010 Installation of the Fuel Metering Unit (FMU)
Ref. AMM 78-10-00-200-012 Visually Examine the Mixed Exhaust System
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 79-21-41-000-010 Removal of the Oil Pressure Pump and Filter Assembly
Ref. AMM 79-21-41-400-010 Installation of the Oil Pressure Pump and Filter Assembly
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 79-21-43-400-010 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
REFERENCE DESIGNATION
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
Smoke from Inlet or Exhaust of Engine 2
Figure 79(IAE)-00-00-991-00300-A / SHEET 1/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
Figure 79(IAE)-00-00-991-00300-A / SHEET 2/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
Figure 79(IAE)-00-00-991-00300-A / SHEET 3/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
Figure 79(IAE)-00-00-991-00300-A / SHEET 4/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
Figure 79(IAE)-00-00-991-00300-A / SHEET 5/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
Figure 79(IAE)-00-00-991-00300-A / SHEET 6/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
Figure 79(IAE)-00-00-991-00300-A / SHEET 7/7 - Smoke from Inlet or Exhaust of Engine 2 not printed,
as per printing preferences
3. Fault Confirmation
Subtask 79-00-00-710-103-A
A. Test. See sheet 1
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
NOTE: Wind direction and engine orientation can cause smoke from a source at the rear of the engine to
be seen at engine inlet (or front of the engine).
NOTE: Smoke can occur after engine shutdown after a rejected take-off, hard braking, rapid engine deceleration
on the ground or in-flight, in flight shutdown and relight. This is not an indication of an engine
fault.
NOTE: If smoke is seen from more than one of the engine locations given below, instructions must be
followed for all affected areas. It is recommended to obey the tail pipe fire troubleshooting first if
there are both smoke and tail pipe fire.
NOTE: It is not necessary to do again a subtask which was completed before during this troubleshooting
task.
NOTE: A tail pipe fire is described as flames visible from the exhaust of the engine. A tail pipe fire will not
result in an engine fire warning on the flight deck.
(1) Do the steps that follow: See sheet 1
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
(a) If there is no smoke from the engine:
- Return the engine to service.
(b) If the smoke is from the Bypass duct:
- Continue with Para 4. A.
(c) If the smoke is from the de-oiler:
- Continue with Para 4. B.
(d) If the smoke is from the Turbine Exhaust Case (TEC):
- Continue with Para 4. C.
(e) If there is tail pipe fire:
- Continue with Para 4. D.
4. Fault Isolation
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
Subtask 79-00-00-810-091-A
A. If the smoke is from the Bypass duct: See sheet 2
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
(1) Do a check of the oil system externals for signs of leakage. Examine the gearbox seal drains and
engine cowl at the breather exit for wetness.
(a) If there are no signs of oil wetting:
- Continue to Para 4. A. (2).
(b) If there are signs of oil wetting:
· 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 carbon 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 Para 4. A. (2).
(2) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If no smoke was found during the test run:
· Return the engine to service.
(b) If smoke was found during the test run:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
Subtask 79-00-00-810-092-A
B. If the smoke is from the de-oiler: See sheets 3, 4 and 5
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
(1) Do a check for the color of the smoke.
(a) If the color of the smoke is not white:
· Replace the de-oiler carbon seal Ref. AMM 72-60-31-000-010 and Ref.
AMM 72-60-31-400-010 continue to Para 4. B. (2).
(b) If the color of the smoke is white:
· Continue to Para 4. C. (4).
(2) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If no smoke found was during the test run:
· Return the engine to service.
(b) If smoke was found during the test run:
· Replace the oil scavenge pump Ref. AMM 79-22-41-000-010 and Ref.
AMM 79-22-41-400-010 .
· Continue to Para 4. B. (3).
(3) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If no smoke was found during the test run:
· Return the engine to service.
(b) If smoke was found during the test run:
· Replace the oil pressure pump Ref. AMM 79-21-41-000-010 and Ref.
AMM 79-21-41-400-010 .
· Continue to Para 4. B. (4).
(4) Do an idle leak check (test 3) and find if there is smoke Ref. AMM 71-00-00-710-012 .
(a) If no smoke was found during the test run:
· Return the engine to service.
(b) If smoke was found during the test run:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
Subtask 79-00-00-810-109-B
C. If the smoke is from the Turbine Exhaust Case (TEC): See sheets 4 and 5
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
(1) Do a check of the TEC weep hole for signs of oil wetting Ref. AMM 72-50-00-200-010 .
(a) If there are no signs of oil wetting:
· Continue with Para 4. C. (2).
(b) If there are signs of oil wetting:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
(2) Do a check of the TEC for oil pooling and a check of oil wetting on the stage 7 turbine blades.
(a) If there is no oil pooling on the TEC or oil wetting on the stage 7 turbine blades:
· Continue with Para 4. C. (4).
(b) If there is oil pooling on the TEC or oil wetting on the stage 7 turbine blades:
· Repair leaks on common sources:
* Blind cap seal Ref. AMM 72-51-41-000-012 and Ref.
AMM 72-51-41-400-012 .
· Continue with Para 4. C. (3).
(3) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Continue with Para 4. C. (4).
(4) Do an inspection of the fuel distribution system Ref. AMM 73-10-00-200-010 and find if there are fuel
leaks.
(a) If there are no fuel leaks:
· Continue with Para 4. C. (5).
(b) If there are fuel leaks:
· Do the repair.
· Continue with Para 4. C. (5).
(5) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Continue with Para 4. C. (6).
(6) Do an inspection of the magnetic chip detectors Ref. AMM 79-00-00-200-011 and an inspection of
the oil filters Ref. AMM 79-00-00-200-012 for contamination.
(a) If there is no contamination:
· Continue with Para 4. C. (7).
(b) If there is contamination:
· Refer to Ref. AMM 79-00-00-200-011 and Ref. AMM 79-00-00-200-011 for inspection
criteria:
1 If contamination is more than AMM limits:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
2 If contamination is in the AMM limits:
· Continue with Para 4. C. (7).
(7) Do an inspection of the No. 5 bearing compartment and of the TEC Ref. AMM 72-50-00-200-010 .
(a) If the TEC cover is not externally dry and clean:
1 Examine the No. 5 bearing compartment and the oil service tubes for coke (SBE 72-0461).
2 Replace the No. 5 bearing compartment seal Ref. AMM 72-51-41-000-010 and Ref.
AMM 72-51-41-400-010 .
3 If necessary, clean the No. 5 bearing compartment Ref. AMM 72-50-50-100-010 .
4 Examine the No. 4 bearing scavenge valve Ref. AMM 79-20-00-200-010 .
5 Continue with Para 4. C. (8).
(b) If the TEC cover is externally dry and clean:
· Remove and replace the oil scavenge pump Ref. AMM 79-22-41-000-010 and Ref.
AMM 79-22-41-400-010 .
· Continue with Para 4. C. (9).
(8) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Remove and replace the oil scavenge pump Ref. AMM 79-22-41-000-010 and Ref.
AMM 79-22-41-400-010 .
Continue with Para 4. C. (9).
(9) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Continue to Para 4. C. (10).
(10) Do a check for oil consumption of more than 0.3 US Qts/hr (0.6 pt/hr).
(a) If the oil consumption is not more than 0.3 US Qts/hr (0.6 pt/hr):
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
(b) If the oil consumption is more than 0.3 US Qts/hr (0.6 pt/hr):
· Do the (Ref. TSM 79-00-00-810-839) for elevated oil consumption on engine 2.
· Continue with Para 4. C. (11).
(11) Do an idle leak check (test 3) and find if there is smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
Subtask 79-00-00-810-110-B
D. If there is tail pipe fire: See sheets 6 and 7
(Ref. Fig. Smoke from Inlet or Exhaust of Engine 2)
(1) Do a check of the No. 4 bearing weep hole for signs of oil wetting Ref. AMM 72-50-00-200-010 :
(a) If there are no signs of oil wetting:
· Examine the Common Nozzle Assembly (CNA) and the adjacent components Ref.
AMM 78-10-00-200-012 .
· Continue with Para 4. D. (2).
(b) If there are signs of oil wetting:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
(2) Do an inspection of the fuel distribution system Ref. AMM 73-10-00-200-010 and find if there are fuel
leaks.
(a) If there are no fuel leaks:
· Continue with Para 4. D. (3).
(b) If there are fuel leaks:
· Do the repair.
· Continue with Para 4. D. (3).
(3) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 :
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Continue with Para 4. D. (4).
(4) Do an inspection of the No. 5 bearing compartment and of the TEC Ref. AMM 72-50-00-200-010 :
(a) If the TEC cover is not externally dry and clean:
1 Examine the No. 5 bearing compartment and the oil service tubes for coke (SBE 72-0461).
2 Replace the No. 5 bearing compartment seal Ref. AMM 72-51-41-000-010 and Ref.
AMM 72-51-41-400-010 .
3 If necessary, clean the No. 5 bearing compartment Ref. AMM 72-50-50-100-010 .
4 Examine the No. 4 bearing scavenge valve Ref. AMM 79-20-00-200-010 .
5 Continue with Para 4. D. (5).
(b) If the TEC cover is externally dry and clean:
· Do a borescope inspection of the fuel nozzles and combustion chamber Ref.
AMM 72-00-00-200-013 .
· Remove and replace the Fuel Distribution Valve (FDV) Ref. AMM 73-13-43-000-010 and
Ref. AMM 73-13-43-400-010 .
· Continue with Para 4. D. (6).
(5) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Do a borescope inspection of the fuel nozzles and combustion chamber Ref.
AMM 72-00-00-200-013 .
· Remove and replace the Fuel Distribution Valve (FDV) Ref. AMM 73-13-43-000-010 and
Ref. AMM 73-13-43-400-010 .
· Continue with Para 4. D. (6).
(6) Do an idle leak check (test 3) and find if there is still smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Remove and replace the Fuel Metering Unit (FMU) Ref. AMM 73-22-52-000-010 and Ref.
AMM 73-22-52-400-010 .
· Continue with Para 4. D. (7).
(7) Do an idle leak check (test 3) and find if there is smoke Ref. AMM 71-00-00-710-012 .
(a) If there is no smoke:
· Return the engine to service.
(b) If there is smoke:
· Remove the engine from service Ref. AMM 71-00-20-000-040 and Ref.
AMM 71-00-20-400-040 .
5. Close-up
Subtask 79-00-00-860-053-A
A. Put the aircraft back to its initial configuration.
(1) Make sure the that the fan cowls are closed Ref. AMM 71-13-00-410-010 .
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the warning notice(s). [Rev.6 from Feb 2017] 2026.04.04 04:38:25 UTC