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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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04/19/21

Message Overview:

Message Name:

EGT SENSOR 1A

Message Code:

B3-302952

Associated CAS:

None

Reporting LRU: L ENG EGT SNSR A
System Description: 77-20-00
Schematic Diagram: None
Wiring Diagram: None

Message Description:

Left engine EGT sensor fault 1A.

[MCID 0806]
EGT Sensor 1A.
Detection of a fault in the EGT sensor harness between the EGT sensor and the ECU A. The ECU A cannot support full system operation.

Possible Causes:

  • Wiring Harness (W5)
  • Wiring Harness (W4)
  • Left Engine EGT Sensor
  • Full Authority Digital Engine Control (FADEC) Electronic Control Unit A (ECU) (A41)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801
Operational Test of the Engine Exhaust Gas Temperature (EGT) Rakes (Probes) AMM 77-21-00-710-802
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. MCID 0806 fault present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual TASK 72-00-00-810-118-A01.

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