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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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03/19/21

Message Overview:

Message Name:

NO L-CDU-6 BUS INPUT

Message Code:

B3-006565

Associated CAS:

None

Reporting LRU: DME 1
System Description: 34-53-00
Schematic Diagram: 34-53-00
Wiring Diagram: 34-53-01
34-61-05

Message Description:

L-CDU-6 data absent at L-DME and not at least 3-of (L-IOC, L-NAV(ADF/VIR), L-VHF).

Possible Causes:

  • Distance Measuring Equipment (DME) Transceiver 1 (LH) (A49)
  • Junction Box 3 (JB3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB3 AMM 24-63-09-000-802
Installation of the Junction Box JB3 AMM 24-63-09-400-802
Removal of the Distance Measuring Equipment (DME) Transceiver AMM 34-53-01-000-801
Installation of the Distance Measuring Equipment (DME) Transceiver AMM 34-53-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Reset DME 1 (CB1-A2) circuit breaker.

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

  2. Swap DMEs.

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

  3. Do a wiring check of the ARINC 429 data bus L-CDU-6 from DME 1 connector A49P1 to Junction Box 3 connector JB3DP1 or respective Test Point. Repair/replace as required.

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

  4. Replace Junction Box 3.
  5. Do close out.

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