# SDR ASAA2021121836933

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 18, 2021
- Submitted: December 21, 2021
- Operation: Air carrier
- Aircraft: [N495AS](https://openairdocs.org/aircraft/N495AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41728
- Aircraft time: 21,426 hours, 6,761 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Unknown
- Part number: 8220990004
- Part serial: 17H34Y
- Condition: Inoperative
- Location: Aft Cgo Comp
- Part time: 44,484 hours, 13,250 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021121836933

## Discrepancy

HF 1 RADIO UNABLE TO TRANSMIT NOR RECEIVE ON BOTH ACP'S. GROUNDED - YES. REMOVED AND REPLACED HF #1 TRANSCEIVER PER B737-900 AMM 23-11-21. PERFORMED GOOD INSTALLATION TEST OF HF #1 PER AMM 23-11-21-400-801. PERFORMED GOOD HF #1 SYSTEM TEST PER AMM 23-11-00-730-801. GROUND VERIFICATION TEST PASSED.

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