# SDR ASAA2023102245799

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 22, 2023
- Submitted: October 26, 2023
- Operation: Air carrier
- Aircraft: [N958AK](https://openairdocs.org/aircraft/N958AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44072
- Aircraft time: 2,971 hours, 817 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Transceiver
- Part number: 8220990004
- Part serial: 4TKVN1
- Condition: Faulty
- Location: E/E Rack E6
- Part time: 3,018 hours, 829 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/ASAA2023102245799

## Discrepancy

UNABLE TO TRANSMIT ON HF#1. WE CAN RECEIVE ON BOTH HF#1 AND HF#2. TRANSMIT ON HF#2 AND GOOD SELCAL ON HF#1 AND HF#2. SATCOM WORKS GREAT. GROUNDED - YES. REMOVED & REPLACED #1 HF TRANSCEIVER PER B737-9 AMM TASK 23-11-21/401. OPS CHECK GOOD. SIDETONE AND TONE OKAY.

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