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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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07/06/21

Message Overview:

Message Name:

OIL FIRE DETECTION (CHANNEL B) FAILURE

Message Code: 772OBS005
Effectivity: All
System: Oil Fire Detection System
System Description: 77-20-00
Schematic Diagram: 77-20-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 71-50-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The fault message is set when there is an open or short circuit in the interface wiring or the Oil Fire-Detection Thermocouple. During Engine operation the Oil Fire-Detection circuits are continuously monitored by the Full-Authority Digital Engine Controller (FADEC).

Possible Causes:

  • Oil Fire-Detection Thermocouple
  • Engine Electronic Controller (EEC)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Engine Safety Precautions AMM 71-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Opening of the Cowls AMM 71-10-00-010-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Closing of the Cowls AMM 71-10-00-410-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Bypass-Duct Access Panels
(451AL/461AL, 451BL/461BL, 451CL/461CL, 451DL/461DL,
451EL/461EL, 452FR/462FR, 452GR/462GR, 452HR/462HR,
452JR/462JR, 452KR/462KR)		 AMM 72-71-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Bypass-Duct Access Panels
(451AL/461AL, 451BL/461BL, 451CL/461CL, 451DL/461DL,
451EL/461EL, 452FR/462FR, 452GR/462GR, 452HR/462HR,
452JR/462JR, 452KR/462KR)		 AMM 72-71-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Deactivation of the Thrust Reverser (for Maintenance) AMM 78-30-00-040-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Activation of the Thrust Reverser (for Maintenance) AMM 78-30-00-440-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Combustion Section Fairings EMM 73-03-02-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Combustion Section Fairings EMM 73-03-02-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Engine Electronic Controller (EEC) EMM 73-21-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Engine Electronic Controller (EEC) EMM 73-21-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Oil Fire Detection Thermocouple EMM 77-22-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Oil Fire Detection Thermocouple EMM 77-22-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

CAUTION: DO NOT DO ELECTRICAL CHECKS INTO THE ENGINE ELECTRONIC CONTROLLER (EEC). IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.

  1. Open the circuit breakers that follow:

    System Name Circuit Breaker Name Bus Name
    ENGINE L FADEC CH A BATT
    ENGINE L FADEC CH B BATT
    ENGINE L ENG IGN 1 BATT
    ENGINE L ENG IGN 2 BATT
    ENGINE L ENG FUEL HPSOV BATT
    ENGINE L ENG START A BATT
    ENGINE L ENG START B BATT
    ENGINE L T/R CTL VALVE BATT
    ENGINE L T/R LOWER LOCK BATT
    ENGINE L T/R UPPER LOCK BATT

  2. Perform a deactivation of the thrust reverser.
  3. Open the cowls.
  4. Remove the applicable bypass-duct access panel and combustion section fairing.
  5. Examine the interface wiring for damage between the connectors and the terminal blocks that follow:

    • The EEC connector P1047
    • The bypass duct connectors J1032 and P1032
    • The terminal blocks TB2117, TB2118 and the ground connector GC2106
    • The Alumel and Chromel connector posts on the ITT thermocouples
      NOTE: Look specially for signs of damage adjacent to clip locations.

    1. If any damage is found, repair or replace the damage as required and go to step 16.
    2. If no damage is found, monitor the system to see if the fault message occurs again and continue with next step.

  6. Check if the fault message is active or not.

    1. If the fault message is not active, go to step 16.
    2. If the fault message is active, continue with next step.

  7. Perform the fault isolation for the ITT signal, disconnect the EEC connector P1044 and the bypass duct connector P1030.
  8. Disconnect the interface wiring at the terminal blocks TB2117 and TB2118, and at the ground connector GC2106.
  9. Examine the interface wiring and connectors for damage between the connectors and the terminal blocks that follow:

    • The EEC connector P1047
    • The bypass duct connectors J1032 and P1032
    • The terminal blocks TB2117, TB2118 and the ground connector GC2106
    • The Alumel and Chromel connector posts on the ITT thermocouples
      NOTE: Look specially for signs of chafing adjacent to clip locations, condition of connector pins and wiring kink or strain.

    1. If any damage is found, repair or replace the damage as required and go to step 16.
    2. If no damage is found, continue with next step.

  10. Clean the terminal blocks TB2117 and TB2118, and the ground connector GC2103.
  11. Perform wiring checks between TB2117 and Bypass Duct (P1030).

    1. If the wiring checks are not good, repair the defective wiring as required and go to step 16.
    2. If the wiring checks are good, continue with next step.

  12. Perform wiring checks between TB2118 and Bypass Duct (P1030).

    1. If the wiring checks are not good, repair the defective wiring as required and go to step 16.
    2. If the wiring checks are good, continue with next step.

  13. Perform wiring checks between Bypass Duct (J1032) and EEC (P1047).

    1. If the wiring checks are not good, repair the defective wiring as required and go to step 16.
    2. If the wiring checks are good, continue with next step.

  14. Replace the oil fire-detection thermocouple.
  15. Install the applicable combustion section fairing and bypass-duct access panel.
  16. Close the cowls.
  17. Perform the activation of the thrust reverser.
  18. Close the circuit breakers that follow:

    System Name Circuit Breaker Name Bus Name
    ENGINE L FADEC CH A BATT
    ENGINE L FADEC CH B BATT
    ENGINE L ENG IGN 1 BATT
    ENGINE L ENG IGN 2 BATT
    ENGINE L ENG FUEL HPSOV BATT
    ENGINE L ENG START A BATT
    ENGINE L ENG START B BATT
    ENGINE L T/R CTL VALVE BATT
    ENGINE L T/R LOWER LOCK BATT
    ENGINE L T/R UPPER LOCK BATT

  19. Make sure that the primary indication of ITT shows on the EICAS display.
  20. Do close out.

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