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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

05/06/21

Message Overview:

Message Name:

R/T CIRCUITRY

Message Code:

B3-481257

Associated CAS:

None

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

Message Description:

Failure or problem is reported in the left HF R/T circuitry.

  • R/T power amp fault (Label 351 - Bit 17)
  • R/T power amp overtemp (Label 351 - Bit 18)
  • R/T input power fault (Label 351 - Bit 22)

Possible Causes:

  • Left HF Transceiver (HF) 1 (A61)
  • Left HF Antenna Coupler (CP5)
  • Fiber Optic Cables
  • 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
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02
Standard Practices - Fiber Optics - Maintenance Practices - ALL SPM 20-51-00-02

Troubleshooting Recommendations:

  1. Reset HF 1 Circuit Breaker CB1-B3. Is the fault message still present?

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

  2. Interchange 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.

  3. Do close out.
  4. Make sure all PWR & Chassis ground are present at the HF#1 Transceiver.

    1. If fault is corrected, continue to next step.
    2. If fault persist, contact CRC for additional troubleshooting using the MDC download submitted in step 3.

  5. Make sure power is present at the HF#1 Transceiver. Is the fault message still present?

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

  6. Check all Fiber Optics between #1 HF Antenna Coupler to the HF#1 Transceiver. Is the fault message still present?
    (i.e. HF 1 transceiver P3 and HF Antenna Coupler P2).

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

  7. Interchange Antenna Coupler 1 with Antenna Coupler 2. If the problem is still on the same side, proceed with the steps below.
  8. Download MDC and send all files back to the CRC for review.

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