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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.

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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

02/23/24

Message Overview:

The Cabin Audio Power Amplifier (APA) provides two modes. Cabin Audio and Passenger Address (PA). PA is typically aligned with ATA 23 and therefore this page is a placeholder to direct users of this tool to ATA 44, the location of the Cabin Audio. Click on the link below to open the Observed Fault listed.  

442OBS001 - AUDIO POWER AMPLIFIER NOISE

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