# SDR ASAA2018011123160

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2018
- Submitted: January 17, 2018
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 43,823 hours, 12,907 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transceiver
- Part number: 8220990004
- Part serial: 18YGX9
- Condition: Failed
- Location: Nr 1 Hf System
- Part time: 17,787 hours, 5,211 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018011123160

## Discrepancy

GROUND CHECK OF THE NR 1 AND 2 HF SYSTEM, WAS OK. AIRBORNE NR 1 HF COULD NOT TRANSMIT. CAN HEAR SIDE TONE AND ATC BUT CANNOT TRANSMIT.  ACFT GROUNDED.  REMOVED AND REPLACED THE NR 1 HF TRANSCEIVER. OPS CHECKED GOOD,  NO DEFFECTS NOTED IAW AMM 23-11-21-000-801 AND AMM 23-11-21-400-801.

---
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.