# SDR ASAA2020122933787

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2020
- Submitted: January 1, 2021
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 54,170 hours, 15,820 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Hf Comm
- Condition: Malfunctioned
- Location: Nr 1
- 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/ASAA2020122933787

## Discrepancy

H1 DOESN'T XMIT.  GROUNDED-YES.  PERFORMED B737-800 FIM 23-11 TASK 806 HF1 OPERATIONS NORMAL.  PERFORMED BITE TEST 23-11 TASK 801, NO FAULTS FOUND.  SEAMC MARK NOTIFIED.

---
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.