# SDR ASAA2020121133673

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2020
- Submitted: December 15, 2020
- Operation: Air carrier
- Aircraft: [N464AS](https://openairdocs.org/aircraft/N464AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40714
- Aircraft time: 25,469 hours, 8,025 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transceiver
- Part number: 8220990004
- Part serial: 40CHRF
- Condition: Failed
- Location: Nr 2 Hf Comms
- Part time: 25,469 hours, 8,025 cycles
- Stage of operation: TX
- 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/ASAA2020121133673

## Discrepancy

ON PREFLIGHT, "FAIL" ON HF2 RADIO.  GROUNDED-YES.  VERIFIED FAULT, ACCOMP.  HF NR 2 TRANSCEIVER BITE TEST, TEST FAILS TO LIGHT UP ANY INDICATIONS.  CYCLED C/B NO HELP.  REPLACED HF NR 2 TRANSCEIVER WITH SERVICEABLE ONE.  ACCOMPLISHED TRANSCEIVER INSTALLATIONN TEST, TEST PASS, REF B737-900 FIM 23-11 TASK 802 & B737-900 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.