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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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09/26/19

Message Overview:

Fault Message:

L ITT SIGNAL WRG XCK

Fault Code:

7325727LBR

Associated CAS:

None

Reporting LRU: Engine Electronic Controller (EEC) 1
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 ]

Fault Description:

There is an unsatisfactory difference between the signals from channel A and channel B of the Inter-Turbine Temperature (ITT) Thermocouples. The ITT circuits are continuously monitored by the Full-Authority Digital Engine-Controller (FADEC).

NOTE: Loss of ITT indication (dashes) if both channel A and B are at fault.

Possible Causes:

  • Inter-Turbine Temperature (ITT) Thermocouple
  • Left 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 Inter-Turbine Temperature (ITT) Harness EMM 77-21-02-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Inter-Turbine Temperature (ITT) Harness EMM 77-21-02-400-801 [ 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 the applicable combustion section fairing.
  5. Examine the interface wiring for damage between the connectors and the terminal blocks that follow:

      For Channel A:

    • The EEC connector P1044
    • The bypass duct connectors J1030 and P1030
    • The terminal blocks TB2112 and TB2113, and the ground connector GC2103
    • The Alumel and Chromel connector posts on the ITT thermocouples
      For Channel B:

    • The EEC connector P1047
    • The bypass duct connectors J1032 and P1032
    • The terminal blocks TB2215 and TB2216, and the ground connector GC2203
    • The Alumel and Chromel connector posts on the ITT thermocouples
      NOTE: Look specially for signs of damage adjacent to clip locations.

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

  6. Check if the fault message L ITT SIGNAL WRG XCK is active.

    1. If the fault message exists, replace the EEC 1 and do close out.
    2. If the fault message does not exists, continue with next step.

  7. Install the applicable combustion section fairing.
  8. Close the cowls.
  9. Perform the activation of the thrust reverser.
  10. 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

  11. Connect the electrical power to the aircraft.
  12. Check if the fault message L ITT SIGNAL WRG XCK is active.

    1. If the fault message does not exists, go to step 26.
    2. If the fault message exists, continue with next step.

  13. 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

  14. Perform a deactivation of the thrust reverser and open the cowl.
  15. Remove the applicable bypass-duct access panel and the applicable combustion section fairing.
  16. Disconnect the EEC connectors P1044 and P1047, and the bypass duct connectors P1030 and P1032.
  17. Disconnect the wiring at the terminal blocks TB2112, TB2113, TB2215 and TB2216, and at the ground connectors (GC2103 and GC2203).
  18. Examine the interface wiring and connectors for damage between the connectors and the terminal blocks that follow:

      For channel A:

    • The EEC connector P1044
    • The bypass duct connectors J1030 and P1030
    • The terminal blocks TB2112 and TB2113, and the ground connector GC2103
    • The Alumel and Chromel connector posts on the ITT thermocouples

      • For channel B:
    • The EEC connector P1047
    • The bypass duct connectors J1032 and P1032
    • The terminal blocks TB2215 and TB2216, and the ground connector GC2203
    • 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.

  19. Perform wiring checks for channel A between TERMINAL BLOCK TB2112 and Bypass Duct (P1030).

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

  20. Perform wiring checks for channel A between TERMINAL BLOCK TB2113 and Bypass Duct (P1030).

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

  21. Perform wiring checks for channel A between Bypass Duct (J1030) and EEC (P1044).

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

  22. Perform wiring checks for channel B between TERMINAL BLOCK TB2215 and Bypass Duct (P1032).

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

  23. Perform wiring checks for channel B between TERMINAL BLOCK TB2216 and Bypass Duct (P1032).

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

  24. Perform wiring checks for channel B between Bypass Duct (J1032) and EEC (P1047).

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

  25. Install the applicable combustion section fairing and the applicable bypass-duct access panel.
  26. Close the cowls.
  27. Perform the activation of the thrust reverser.
  28. 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

  29. Connect the electrical power to the aircraft.
  30. Check if the fault message L ITT SIGNAL WRG XCK is active.

    1. If the fault message exists, replace the ITT harness.
    2. If the fault message does not exists, continue with next step.

  31. Check if the fault message L ITT SIGNAL WRG XCK is active.

    1. If the fault message exists, replace the ITT thermocouple(s)
    2. If the fault message does not exists, continue with next step.

  32. Make sure that the primary indication of ITT shows on the EICAS display.
  33. Disconnect the electrical power to the aircraft.
  34. Do close out.

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