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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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02/25/21

Message Overview:

Message Name:

O/P DISCRETE-SMOKE DET

Message Code:

B3-006754

Associated CAS:

FIRE SYS FAULT
(Advisory)

Reporting LRU: FIREX CTRL UNIT
System Description: 26-11-00
Schematic Diagram: 26-11-00
Wiring Diagram: 26-11-05

Message Description:

Fault in FIREX Control Unit (CU) SMOKE discrete output to Data Concentrator Unit (DCU) is detected.

Possible Causes:

  • FIREX Control Unit (A91)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Fire-Detection-and-Extinguishing (FIREX) Control-Unit AMM 26-11-01-000-801
Installation of the Fire-Detection-and-Extinguishing (FIREX) Control-Unit AMM 26-11-01-400-801
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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Perform wiring check (short circuit to ground) between FIREX control unit (A91P1 pin 21) and DCU (A14EP1 pin 15J) (repair as required).

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Replace FIREX control unit.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Replace DCU.
  4. Do close out.

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