# SDR CALA2022082202137

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2022
- Submitted: August 22, 2022
- Operation: Air carrier
- Aircraft: [N37531](https://openairdocs.org/aircraft/N37531), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 66119
- Aircraft time: 458 hours, 146 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Hf Comm
- Part number: NA
- Condition: Inoperative
- Location: Both Hf 1&2
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2022082202137

## Discrepancy

2 HF RADIOS INOP COUPLERS #1 AND #2 REPLACEMENT NO FAULT ON OMF EXISTING FAULT, STILL BAD TRANSMISSION AND RECEPTION ON BOTH HF SYSTEM. REMOVED AND REPLACED #2 HF TRANCEIVER. OPS CHK GOOD. ALSO REPLACED # 2 HF COUPLER AND  # 1 HF COUPLER . OPS CHECK GOOD.

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