# SDR ASAA2020123033792

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 30, 2020
- Submitted: January 5, 2021
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 54,175 hours, 15,821 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transceiver
- Condition: Malfunctioned
- Location: Nr 1 Hf Comms
- 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/ASAA2020123033792

## Discrepancy

HF NR 1 DOES NOT TRANSMIT.  RECEIVES, CAN HEAR TRANSMITTER CLICK AND SIDE TONE WHILE ATTEMPTING, SELCAL WORKS.  GROUNDED-YES.  RERACKED NR 1 HF RECEIVER, REF B737-800 AMM 23-11-21-400-801, OPERATIONS NORMAL, REF AMM 23-11-00-730-801.  TRANSMIT AND RECEIVED LOUD AND CLEAR.  GROUND VERIFICATION CHECKS, SUCCESSFUL.

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