# SDR CALA2026033114986

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2026
- Submitted: March 31, 2026
- Operation: Air carrier
- Aircraft: [N27901](https://openairdocs.org/aircraft/N27901), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34821
- Aircraft time: 51,341 hours, 6,350 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transceiver
- Part number: 8220990120
- Part serial: 4C5D7K
- Condition: Faulted
- Location: Lt Hf Comms
- Part time: 35,987 hours, 3,458 cycles
- 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/CALA2026033114986

## Discrepancy

LEFT HF RADIO TRANSMISSION PROBLEM. LEFT HF RADIO DOES NOT TRANSMIT LOOKING AT TIMELINE OF FAULTS BOTH 23-11071 AND 23-11082 HAVE OCCURED LAST 3 OF 4 FLIGHT LEGS WITH 23-11071 OCCURING MINUTES BEFORE SECOND FAULT SUGGEST LEFT HF COUPLER MAY BE AT FAULT. REF FIM DMC-B787-A-23-10-F1-16A-421A-A LOCKING.  REMOVED AND REPLACED LH HF TRANSCEIVER IAW AMM 23-11-05. OPS CHKD IAW AMM 23-11-00-00A-320A-A. OPS CHKD GOOD.  PERFORMED DIRECT COMMS TEST WITH NEW YORK COMMS. SUCCESSFULLY TRANSMITTED & RECEIVED COMMS. NO OTHER DEFECTS NOTED.

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