# SDR ASAA2021121436905

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 14, 2021
- Submitted: December 16, 2021
- Operation: Air carrier
- Aircraft: [N518AS](https://openairdocs.org/aircraft/N518AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35693
- Aircraft time: 46,882 hours, 13,790 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Coupler
- Part number: 8220987004
- Part serial: 163709
- Condition: Faulty
- Location: Vertical Fin
- Part time: 46,867 hours, 13,777 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/ASAA2021121436905

## Discrepancy

#1 HF TRANSMIT FUNCTION INOP. GROUNDED - YES. REMOVED AND REPLACED #1 HF COUPLER REF B737-800 AMM 23-11-61 OP'S CHECK OK #1 HF TRANSMITS AND RECEIVES NORMALLY GROUND VERIFICATION SUCCESSFUL.

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