# SDR ASAA2019020328034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 3, 2019
- Submitted: February 6, 2019
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 45,314 hours, 13,465 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Hf Comm
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019020328034

## Discrepancy

HF RADIO PARTIAL FAIL- HF RADIO NR 1 UNABLE TO TRANSMIT SIDE TONE CONTINUOUS FOR AN HOUR. GROUNDED - YES. PERFORMED FIM 23-11 TASK 801 NR 1 AND NR 2 HF TASKS. PERFORMED HF COM SYSTEM TEST PER FIM 23-11 TASK 806. OPS CHECK NORMAL, NO DEFECTS NOTED.

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