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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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03/24/21

Message Overview:

Message Name:

INTERNAL FAULT

Message Code:

B3-007249

Associated CAS:

None

Reporting LRU: NAV 1
System Description: 34-51-00
Schematic Diagram: 34-51-00
Wiring Diagram: 34-51-01

Message Description:

Failure internal to NAV ADF/VOR.

Possible Causes:

  • L NAV-4000 VOR/LOC/GS/MB/ADF Receiver 1 (VHF NAV) (A047)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Status = FAILED/WIRING
  2. {Term Definitions}

    1. NAV1-5 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 057A: 11;ADF INTERNAL FAILURE
    2. NAV1-11 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 057V: 11;VIR INTERNAL FAIL

Quick Links:

Removal of the VHF Navigation Receiver AMM 34-51-01-000-801
Installation of the VHF Navigation Receiver AMM 34-51-01-400-801
Functional Test of the VHF Navigation Receiver AMM 34-51-01-720-801
Functional Test of the VOR/LOC Antenna Coupler AMM 34-51-09-720-801
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Ensure CB1-A1 is closed.
  2. Swap the left VHF Navigation Receiver 1 (ADF VOR) (A047) with the right VHF Navigation Receiver 2 (ADF VOR) (A048). Does MDC Fault Code switch to B3-007257?
    NOTE: Swap is only possible for aircraft POST SB 350-34-01 - Installation of the Second Automatic Direction Finder (ADF) Option.

    1. If YES, replace the original Left VHF Navigation Receiver 1 (ADF VOR) (A047).
    2. If NO, continue with next step.

  3. Perform the Functional Test of the VHF Navigation Receiver (AMM 34-51-01-720-801) and the Functional Test of the VOR/LOC Antenna Coupler (AMM 34-51-09-720-801).
  4. Do close out.

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