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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-2 BUS OUTPUT

Message Code:

B3-006764

Associated CAS:

None

Reporting LRU: FMC 1
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-07

Message Description:

L FMC-2 data is reported absent by the L-PFD and L-MFD.

Possible Causes:

  • L FMS/R PFD Mode Selection
  • Flight Management Computer (FMC No. 2) (A4-FMC2)
  • Junction Box 2 (JB2)
  • Adaptive Flight-Display Unit PFD1 (A27)
  • Adaptive Flight-Display Unit MFD1 (A29)
  • Integrated-Avionics Processor System (IAPS) Card Cage (ICC) (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-34-0189 - Pro Line 21 Advanced Avionics Nuisance Messages and FMS-6200 Issues
    Challenger 350 (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

NOTE: This nuisance message is caused by the FMS-6200 software.
Work Around: Switching to the map function for the Right and / or Left PFD should clear this message.

Quick Links:

Removal of the Junction Box JB2 Circuit-Cards AMM 24-63-05-000-802
Installation of the Junction Box JB2 Circuit-Cards AMM 24-63-05-400-802
Removal of the Integrated Avionic Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of the Integrated Avionic Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801
Removal of the Adaptive Flight-Display Unit AMM 31-61-01-000-801
Installation of the Adaptive Flight-Display Unit AMM 31-61-01-400-801
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. Select FMS2 and PPOS Format on L PFD.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.
      NOTE: Aircraft has to be WOFW for the message to be seen, and logged, on the MDC.

  2. Reset R IAPS (CB2-B6) circuit breaker.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Do wiring checks of the ARINC 429 data bus L-FMC-2 between IAPS connector A4P1 pins 26 & 27, through Junction Box 2, and L PFD connector A27P1 pins 35 & 36 and L MFD connector A29P1 pins 35 & 36. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.
      NOTE: An internal short of any LRUs connected to this data bus might cause this failure.

  4. Swap FMCs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  5. Swap PFDs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  6. Swap MFDs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  7. Replace IAPS Card Cage (ICC).
  8. Do close out.

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