# SDR TSAA0723003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 31, 2006
- Submitted: January 4, 2007
- Operation: Air carrier
- Aircraft: [N751AL](https://openairdocs.org/aircraft/N751AL), registered now
- Make and model: Boeing 737-7Q8
- Registry model: [Boeing 737-7Q8](https://openairdocs.org/model/boeing-737-7q8) (OpenAirDocs)
- Aircraft serial: 30674
- Aircraft time: 9,682 hours, 2,409 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transmitter
- Part number: 9640452011
- Part serial: 02081
- Condition: Failed
- Location: Nr 2 Hf System
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TSAA0723003

## Discrepancy

FLIGHT 474 OGG-OAK - DURING CRUISE FLIGHT, THE CREW NOTED THE NR 2 HF RADIO WOULD NOT CHANNELLIZE.  THE CREW CONTINUED TO OAK WITHOUT FURTHER INCIDENT.  MAINTENANCE REMOVED AND REPLACED THE NR 2 HF RECEIVER TRANSMITTER PER MM 23-11-21.  THE NR 2 HF RADIO PASSED A GROUND OPERATIONAL CHECK.  MAINTENANCE ALSO FOUND THE NR 1 HF COUPLER FAULTING AND REMOVED AND REPLACED THE NR 1 COUPLER PER AMM 23-11-61.  THE NR 1 COUPLER PASSED A GROUND OPERATIONAL CHECK.  THE AIRCRAFT WAS RETURNED TO SERVICE.  BOTH HF RADIO SYSTEMS SUCCESSFULLY PASSED FLIGHT VERIFICATION CHECKS ON THE NEXT FLIGHT LEG.

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