# SDR ASAA2021020233998

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 2, 2021
- Submitted: February 4, 2021
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 29,388 hours, 9,467 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transceiver
- Part number: 8220990004
- Part serial: 40F88C
- Condition: Inoperative
- Location: Nr 2 Hf Comms
- Part time: 29,380 hours, 9,465 cycles
- 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/ASAA2021020233998

## Discrepancy

HF 2 RADIO RECEIVES OKAY, SELCAL HF2 OKAY - BUT NO TRANSMIT OFF EITHER CA OR FO ACP OF HG 2. GROUNDED - YES. REMOVED AND REPLACED #2 HF TRANSCEIVER PER B737-900 AMM 23-11-21. ETOPS GROUND VERIFICATION SUCCESSFUL.

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