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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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02/24/21

Message Overview:

Message Name:

NO L-CDU-7 BUS INPUT

Message Code:

B3-008084

Associated CAS:

None

Reporting LRU: VHF 2
System Description: 23-11-00
34-61-00
Schematic Diagram: 23-11-00
34-61-00
Wiring Diagram: 23-11-02
34-61-07

Message Description:

L-CDU-7 bus data absent at R-VHF and NOT absent at 2-of (R-DME, R-NAV (ADF/VIR)).

Possible Causes:

  • Right VHF Communication Unit (VHF 2) (A8)
  • Junction Box 2 (JB2)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the VHF Communication Unit AMM 23-11-01-000-801
Installation of the VHF Communication Unit AMM 23-11-01-400-801
Removal of the Junction Box JB2 AMM 24-63-05-000-803
Installation of the Junction Box JB2 AMM 24-63-05-400-803
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset COM 2 Circuit Breaker CB2-B2. Is the fault message still present?

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

  2. Swap right VHF (A8) with left VHF (A7). Is the fault message still present?

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

  3. Do wiring check between right VHF (A8) and Junction Box 2 (JB2) for the following wires:

    From To Result
    Conn. A8P1 - 15 Conn. JB2D1 - 2B
    Conn. A8P1 - 16 Conn. JB2D1 - 2C

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair defective wiring.

  4. Replace Junction Box 2 (JB2).
  5. Do close out.

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