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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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04/08/21

Message Overview:

Message Name:

EGT OVERTEMP

Message Code:

B3-006356

Associated CAS:

APU OVERTEMP
(Warning)

Reporting LRU: APU
System Description: 49-00-00
Schematic Diagram: 49-61-00
Wiring Diagram: 49-61-01 Sh 1
49-61-01 Sh 2

Message Description:

For ground operation, this failure triggers a protective shutdown. For flight operation, the shutdown is inhibited.

Possible Causes:

  • Exhaust Gas Temperature (EGT) Limit Exceed
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 11
  2. {Term Definitions}

    1. APU-50 XX 353 01 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 353: 16; APU OVERTEMP

Quick Links:

Removal of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-000-801
Installation of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-400-801
Removal of the Exhaust Gas Temperature (EGT) Sensor AMM 49-61-05-000-801
Installation of the Exhaust Gas Temperature (EGT) Sensor AMM 49-61-05-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. EGT limit exceeded. For ground operation, this failure triggers a protective shutdown. For flight operation, the shutdown is inhibited.

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