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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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04/06/21

Message Overview:

Message Name:

NO L-AHC-3 BUS OUTPUT

Message Code:

B3-673837

Associated CAS:

None

Reporting LRU: AHC 1
System Description: 34-54-00
Schematic Diagram: 34-54-00
Wiring Diagram: None

Message Description:

R-IRS-3 input bus to L MFD is inactive. L PFD is off or L PFD data is absent.

Possible Causes:

  • Inertial Reference System 2 (IRS) (A232)
  • Multi-Function Display 1 (MFD) (A29)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Troubleshooting Recommendations:

  1. Suspect a failed R-IRS-3 bus, a failed L MFD input or wiring.

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