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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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10/04/19

Message Overview:

Fault Message:

L TURBINE OVERHEAT XCK MA

Fault Code:

7327629LBR

Associated CAS:

None

Reporting LRU: Left Engine Electronic Controller (EEC)
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:

The fault message is set when there is an unsatisfactory difference between the signals from channel A and channel B of the Turbine Overheat Detection Thermocouple. During engine operation the turbine overheat detection circuits are continuously monitored by the Full-Authority Digital Engine-Controller (FADEC).

Possible Causes:

  • Turbine Overheat-Detection Thermocouple
  • Left Engine Electronic Controller (EEC)

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 Combustion Section Fairings EMM 73-03-02-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of 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 Turbine Overheat-Detection Thermocouple EMM 77-23-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Turbine Overheat-Detection Thermocouple EMM 77-23-01-400-801 [ 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 and open the cowls.
  3. Remove the applicable bypass-duct access panel and the applicable combustion section fairing.
  4. Check if the maintenance alert message is stored.

    1. If the maintenance alert message is stored, the fault could be intermittent.
    2. If the maintenance alert message is not stored, continue with next step.

  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 TB2114 and TB2115, and the ground connector GC2106

      For Channel B:

    • The EEC connector P1047
    • The bypass duct connectors J1032 and P1032
    • The terminal blocks TB2217 and TB2218, and the ground connector GC2206

    NOTE: Look specially for signs of damage adjacent to clip locations.

  6. Clean the terminal blocks TB2114, TB2115, TB2217 and TB2218, the ground connectors (GC2106 and GC2206) and the Alumel and Chromel terminal lugs.
  7. Check if the fault message L TURBINE OVERHEAT XCK MA is still active.

    1. If the fault message does not exists, go to step 9.
    2. If the fault message exists, troubleshoot it first and continue with next step.

  8. Replace Turbine Overheat Thermocouple.
  9. Close the cowls and perform a activation of the thrust reverser.
  10. Do close out.

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