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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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05/06/21

Message Overview:

Message Name:

NO POWER FROM CB2-A11

Message Code:

B3-006750

Associated CAS:

CARGO SMOKE DET FAIL
(Caution)

GEAR BAY DET FAIL
(Caution)

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:

FIRE Extinguishing A power has failed. The CB2-A11 circuit breaker is open, wire is open, or FIREX Control Unit has failed.

Possible Causes:

  • Missing 28 VDC input or ground to FIREX CU
  • Fire-Detection-and-Extinguishing Control Unit (FIREX CU) (A91)
  • 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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset FIREX Control Unit (A91) circuit breakers CB2-A11. Check MDC for fault.

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

  2. Measure for 28 VDC at 91P2 pin 1. Repair as required.

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

  3. Measure for GND signal at 91P2 pins 9, 15, and 63. Repair as required.

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

  4. Replace FIREX control unit.
  5. Do close out.

eng_fire_loop

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