Fault Message:

R OIL FIRE EXCEEDANCE

Fault Code:

7325317RBR

Associated CAS:

R ENGINE OVHT
(Caution)

There is a high temperature indication from the Oil Fire Detection Thermocouple. The Thermocouple is installed in the exit area for the cooling and sealing airflow from the rear turbine bearing chamber. This is to sense high temperatures in this area which can be a result from the ignition of oil leakage from the bearing chamber. The Oil Fire Detection Thermocouple circuits are continuously monitored by the Full-Authority Digital Engine-Controller (FADEC). This could also be an incorrect high temperature indication because of a defective Oil Fire Detection system. The fault isolation procedure below gives data to do checks for:

• The Oil Fire Detection System to make sure it is serviceable
• The indications of an overheat condition, which can be a result from an oil fire

The fault message CAIMS - L (R) TURBINE OVERHEAT EXCEEDANCE could show at the same time. This gives an indication that there was an inflow of hot annulus gas into the cooling airflow and not necessary an oil fire. But, it is still necessary to do a fault isolation procedure to make sure that an oil fire condition or an incorrect fault indication is not there. The fault isolation procedure below gives data for when the two fault messages show at the same time.

• Oil Fire-Detection Thermocouple
• Turbine Overheat-Detection Thermocouple
• Right Engine Electronic Controller (EEC)

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Check for fault message in CAIMS shown.

   1. If both L (R) OIL FIRE EXCEEDANCE and L (R) TURBINE OVERHEAT EXCEEDANCE fault message show at same time, go to step 22.
   2. If L (R) OIL FIRE EXCEEDANCE fault message shows, continue with next step.

2. Make sure that the oil fire detection system is serviceable, perform a troubleshooting for the oil fire detection thermocouple and wiring.

   1. If the system checks are good then an oil fire occurred, go to step 40.
   2. If the system checks are not good, continue with next step.

3. Perform a check of the ARINC status and maintenance discrete for the aircraft warning system for this oil fire condition.

   1. If the oil fire detection system is serviceable then an oil fire occurred, go to step 40.
   2. If the oil fire detection system is not serviceable, continue with next step.

4. Examine the rear-bearing cooling and sealing air exit area on the inner annulus at the rear of the LP1 nozzle guide vanes.

   1. If there is damage, repair as required and do close out.
   2. If there is no damage, continue with next step.

5. Perform a check of the rear-bearing chamber vent line for carbon contamination.

   1. If there is damage or carbon contamination, repair or replace as required and do close out.
   2. If there is no damage or carbon contamination, continue with next step.

6. Examine the oil-fire-detection thermocouple, remove the oil-fire-detection thermocouple and perform a inspection of the oil-fire-detection thermocouple for damage and indications of an oil fire.

   1. If there is damage, repair as required and do close out.
   2. If there is no damage, install the oil-fire-detection thermocouple and continue with next step.

7. Examine the turbine overheat-detection thermocouple, remove the turbine overheat-detection thermocouple and perform a inspection of the turbine overheat-detection thermocouple for damage and indications of an oil fire.

   1. If there is damage, repair as required and do close out.
   2. If there is no damage, install the turbine overheat-detection thermocouple and continue with next step.

8. Use the recorded oil consumption measurement data to perform a check of the oil content for high oil consumption.
9. Examine the pressure filter element for metal or carbon contamination. Make an analysis of an oil sample for acidity and free carbon content.

   1. If there is damage or carbon contamination, repair or replace as required and do close out.
   2. If there is no damage or carbon contamination, continue with next step.

10. Perform a detailed inspection of the front-bearing-chamber magnetic chip-detector for contamination.

    1. If there is damage or contamination, repair or replace as required and do close out.
    2. If there is no damage or contamination, continue with next step.

11. Perform a detailed inspection of the rear-bearing-chamber magnetic chip-detector for contamination.

    1. If there is damage or contamination, repair or replace as required and do close out.
    2. If there is no damage or contamination, continue with next step.

12. Perform a detailed inspection of the accessory-gearbox magnetic chip-detector.

    1. If there is damage or contamination, repair or replace as required and do close out.
    2. If there is no damage or contamination, continue with next step.
       CAUTION: DO NOT USE A TOOL WITH A SHARP EDGE TO TURN THE LP ROTOR. TOOLS WITH SHARP EDGES CAN CAUSE DAMAGE TO THE LP COMPRESSOR BLADES.

13. Turn the LP rotor assembly in a counterclockwise direction (when you look from the front of the engine). Make sure that the LP rotor turns freely without unusual noises.

    1. If the LP rotor turn freely and there is no unusual noises, go to step 15.
    2. If the LP rotor does not turn freely or there are unusual noises, continue with next step.

14. Examine the LP compressor blades and LP turbine blades for rubbing.

    1. If there is damage, repair or replace as required and do close out.
    2. If there is no damage, continue with next step.

15. Turn the HP rotor in a counterclockwise direction (when you look from the front of the engine). Make sure that the HP rotor turns freely without unusual noises.

    1. If it turn freely and there is no unusual noises, go to step 17.
    2. If it does not turn freely or there are unusual noises, continue with next step.

16. Examine the HP compressor and HP turbine blades for rubbing.

    1. If there is damage, repair or replace as required and do close out.
    2. If there is no damage, continue with next step.

17. Start the engine.
18. Operate the engine to ground idle, and monitor the engine operation limits.
19. Stop the engine.
20. Monitor the engine run down time.
21. Checks for an indication of an oil fire.

    1. If the above checks not give an indication of an oil fire, then the engine is satisfactory for operation and do close out.
    2. If the above checks give an indication of an oil fire, go to step 40.

22. Make sure that the oil fire detection system is serviceable and that no oil fire occurred.

    1. If NO, go to step 40.
    2. If YES, continue with next step.

23. Perform a troubleshooting for the oil fire detection thermocouple and wiring.

    1. If the system checks are not good, repair defective wiring as required and do close out.
    2. If the system checks are good, continue with next step.

24. Perform a check of the ARINC status and maintenance discrete for the aircraft warning system for this oil fire condition.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

25. Check for indications of an oil fire, examine the rear-bearing cooling and sealing air exit area on the inner annulus at the rear of the LP1 nozzle guide vanes.

    1. If there is damage, repair as required and do close out.
    2. If there is no damage, continue with next step.

26. Check for the rear-bearing chamber vent line for carbon contamination.

    1. If there is damage or carbon contamination, repair or replace as required and do close out.
    2. If there is no damage or carbon contamination, continue with next step.

27. Examine the oil-fire-detection thermocouple, remove the oil-fire-detection thermocouple and perform a inspection of the oil-fire-detection thermocouple for damage and indications of an oil fire.

    1. If there is damage, repair as required and do close out.
    2. If there is no damage, install the oil-fire-detection thermocouple and continue with next step.

28. Examine the turbine overheat-detection thermocouple, remove the turbine overheat-detection thermocouple and perfoem a inspection of the turbine overheat-detection thermocouple for damage and indications of an oil fire.

    1. If there is damage, repair as required and do close out.
    2. If there is no damage, install the turbine overheat-detection thermocouple and continue with next step.

29. Use the recorded oil consumption measurement data to do a check of the oil content for high oil consumption.
30. Examine the pressure filter element for metal or carbon contamination. Make an analysis of an oil sample for acidity and free carbon content.

    1. If there is damage or carbon contamination, repair or replace as required and do close out.
    2. If there is no damage or carbon contamination, continue with next step.

31. Perform a detailed inspection of the front-bearing-chamber magnetic chip-detector for contamination.

    1. If there is damage or contamination, repair or replace as required and do close out.
    2. If there is no damage or contamination, continue with next step.

32. Perform a detailed inspection of the rear-bearing-chamber magnetic chip-detector for contamination.

    1. If there is damage or contamination, repair or replace as required and do close out.
    2. If there is no damage or contamination, continue with next step.

33. Perform a detailed inspection of the accessory-gearbox magnetic chip-detector for contamination.

    1. If there is damage or contamination, repair or replace as required and do close out.
    2. If there is no damage or contamination, continue with next step.

34. Turn the LP rotor assembly in a counterclockwise direction (when you look from the front of the engine). Make sure that the LP rotor turns freely without unusual noises.

    1. If the LP rotor turn freely and there is no unusual noises, go to step 36.
    2. If the LP rotor does not turn freely or there are unusual noises, continue with next step.

35. Examine the LP compressor blades and LP turbine blades for rubbing.

    1. If there is damage, repair or replace as required and do close out.
    2. If there is no damage, continue with next step.

36. Turn the HP rotor in a counterclockwise direction (when you look from the front of the engine). Make sure that the HP rotor turns freely without unusual noises.

    1. If it turn freely and there is no unusual noises, go to step 38.
    2. If it does not turn freely or there are unusual noises, continue with next step.

37. Examine the HP compressor and HP turbine blades for rubbing.

    1. If there is damage, repair or replace as required and do close out.
    2. If there is no damage, continue with next step.

38. Checks for an indication of an oil fire.

    1. If the above checks give an indication of an oil fire, go to step 40.
    2. If the above checks not give an indication of an oil fire, continue with next step.

39. Perform a troubleshooting for the turbine overheat exceedance.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

40. Replace power plant.
    NOTE: If you are not sure if an oil fire occurred, then it is recommended that you refer to the BRR representative before you replace the power plant.
41. Do close out.