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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-1 BUS OUTPUT

Message Code:

B3-006763

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-1 bus data not received at L-IOC.

Possible Causes:

  • Flight Management Computer (FMC No. 1) (A4-FMC1)
  • Input/Output Concentrator Unit (IOC) No. 1 (A4-IOC1)
  • 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 Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
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 L IAPS circuit breakers CB1-B6. Is the fault message still present?

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

  2. Swap FMC 1 with FMC 2. Is the fault message still present\?

    1. If YES, continue with next step.
    2. If NO, replace defective FMC.

  3. Swap IOC 1 with IOC 2. Is the fault message still present\?

    1. If YES, continue with next step.
    2. If NO, replace defective IOC.

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

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