# SDR ASAA2021120636824

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2021
- Submitted: December 8, 2021
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 55,723 hours, 16,283 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Coupler
- Part number: 8220987004
- Part serial: 160463
- Condition: Inoperative
- Location: Vertical Fin
- Part time: 35,957 hours, 10,564 cycles
- Stage of operation: NR
- 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/ASAA2021120636824

## Discrepancy

HF 1 AND HF 2 INOP. GROUNDED - YES. REMOVED AND REPLACED HF COUPLER #2 AND RESEATED HF COUPLER #1 IAW B737-900 23-11-61-000-801, 23-11-61-400-801, OPS CHECKS GOOD WITH NEW YORK.

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