# SDR ASAA2021100736213

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 7, 2021
- Submitted: October 8, 2021
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 22,954 hours, 7,302 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021100736213

## Discrepancy

HF #1 FAILED. GROUNDED - YES. CONFIRMED HF1 FAILED ON RAMP AND CONTINUOUS AUDIBLE TONE. RESET HF1 AND PERFORMED OPS CHECK OF HF1. FAIL MESSAGE EXTINGUISHED AND OPERATION TEST OF HF1 COMPUTER OK REF B737-900 AMM 23-11-00-710-801.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.