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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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03/22/21

Message Overview:

Message Name:

NO L-FMC-4 XTALK BUS OUT

Message Code:

B3-006765

Associated CAS:

None

Reporting LRU: FMC 1
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 31-45-01
34-61-03

Message Description:

L-FMC-4 xtalk data bus is not received at R-FMC.

Possible Causes:

  • Flight Management Computer (FMC No. 1) (A4-FMC1)
  • Flight Management Computer (FMC No. 2) (A4-FMC2)
  • Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801
Removal of the Flight Management Computer (FMC) AMM 34-61-01-000-801
Installation of the Flight Management Computer (FMC) AMM 34-61-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset IAPS circuit breakers CB1-B6, CB2-B6 and CB1-E1. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.
      NOTE: Before you open the IAPS circuit breakers, make sure that all Engine FADEC circuit breakers are open. If the Engine FADEC circuit breakers remain closed, Engine Igniters will activate. This can cause injury to persons and damage to equipment.

  2. Replace FMC 1. Is the fault message still present?

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

  3. Replace FMC 2. Is the fault message still present?

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

  4. Replace IAPS Card Cage (A4).
  5. Do close out.

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