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Troubleshooting
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Select color for CAS message that you wish to troubleshoot

(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.

For AOG assistance contact:

CRC Montreal (YUL)
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04/21/25

ATA 49-00-00 Auxiliary Power Unit (APU) Troubleshooting Tips


APU System - FADEC

In order to minimize aircraft downtime and avoid unnecessary removals of FADEC P/N 2118990-3, Honeywell and Bombardier are offering Operators a summary of known issues with available solutions as well as technical information that can be used for effective troubleshooting.

For more information, refer to the following:

APU Oil Level Indication - Amber Dashes During APU Startup or Shutdown

For more information, refer to the following:



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