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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:

ANTENNA COUPLER FAULT

Message Code:

B3-481259

Associated CAS:

None

Reporting LRU: HF 1
System Description: 23-12-00
Schematic Diagram: 23-12-00
Wiring Diagram: 23-12-01
23-12-09

Message Description:

Failure or problem is reported in the left HF Antenna coupler.

  • Antenna/Coupler output fault (Label 351 - Bit 19)
  • Coupler RF module overtemp (Label 351 - Bit 20)
  • Antenna tune fault (Label 351 - Bit 21)
  • Coupler RF output overvoltage (Label 351 - Bit 23)
  • Antenna coupler fault (Label 351 - Bit 28)

Possible Causes:

  • Left HF Antenna Coupler (CP5)
  • Left HF Transceiver (A61)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the HF Transceiver AMM 23-12-01-000-801
Installation of the HF Transceiver AMM 23-12-01-400-801
Removal of the HF Antenna Coupler AMM 23-12-09-000-801
Installation of the HF Antenna Coupler AMM 23-12-09-400-801
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 HF 1 Circuit Breaker CB1-B3 and HF 1 PWR Circuit Breaker CB5-A1. Is the fault message still present?

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

  2. Swap Left HF Antenna Coupler (CP5) with right HF Antenna Coupler (CP6). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace defective HF Antenna Coupler.

  3. Swap Left HF Transceiver (A61) with right HF Transceiver (A62). Is the fault message still present?

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

  4. Contact your FSR for additional Troubleshooting procedure.
  5. Do close out.

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