# SDR ASAA2018040324121

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2018
- Submitted: April 17, 2018
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 42,399 hours, 12,584 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Coupler
- Part number: 8220987004
- Part serial: 181478
- Condition: Failed
- Location: Hf Antenna
- Part time: 5,659 hours, 1,819 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018040324121

## Discrepancy

NR 2 HF RADIO WILL NOT TEST. UNABLE TO GET TONE WHEN TUNING A NEW FREQ. UNABLE TO GET A TONE OR TIME HACK ON FREQ 5000 OR 10.000.  ACFT GROUNDED.  REMOVED AND REPLACED NR 2 HF ANTENNA COUPLER IAW AMM 23-11-61-401, INSTALLATION TESTED GOOD.  RESET 2.

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