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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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Quick Links

03/05/25

Message Overview:

Message Name:

NO FIREX-1 BUS INPUT

Message Code:

B3-006513

Reporting LRU: Data Concentrator Unit (DCU) Channel A
Associated CAS: None
System Description: 31-41-00 - Engine Indication and Crew Alerting System (EICAS)
Schematic Diagram: SSM 26-11-00-101 - Fire-Detection-and-Extinguishing (FIREX) System
SSM 31-41-00-101 - Engine Indication and Crew Alerting System (EICAS)
Wiring Diagram: WM 26-21-13-1_001 - Sheet 1 - Discharge Cartridge (Bottle No. 2) APU - ALL
WM 31-41-01-1_001 - Sheet 1 - Data Concentrator Unit (inserts A - C) - ALL
WM 31-41-02-1_001 - Sheet 1 - Data Concentrator Unit (inserts D - F) - ALL
WM 31-41-03-1_001 - Sheet 1 - Data Concentrator Unit (Interface) - [20501 TO 20886, 20888 TO 20890, 20896 TO 20898]
WM 31-41-13-1_001 - Sheet 1 - EICAS (Power and Indication) - ALL

Message Description:

FIREX-1 bus not received at Data Concentrator Unit (DCU) Channel A, but DCU Channel B is receiving data.

Possible Causes:

  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Safety Precautions - Maintenance Practices - ALL SPM 20-00-01-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Reset EICAS DCU A Circuit Breaker CB1-D1. Is the fault message still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  2. Replace DCU (A14).
  3. Do close out.

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