# SDR ASAA2019070329902

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2019
- Submitted: July 5, 2019
- Operation: Air carrier
- Aircraft: [N594AS](https://openairdocs.org/aircraft/N594AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35191
- Aircraft time: 42,925 hours, 12,876 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019070329902

## Discrepancy

HF #2 DISPLAYED FAIL ON BOTH RCPS. FAIL WOULD GO AWAY WHEN TRANSFER SWITCHED WAS DEPRESSED. FAIL WOULD RETURN AFTER APPROX 5 SECONDS. STATIC AND NORMAL RECEIVE WAS OBSERVED THROUGH AUDIO CHANNEL AT ALL TIMES. DURING WRITE UP FAIL WENT AWAY. GROUNDED - YES. PERFORMED FIM 23-11 TASK 801 HF BITE AND FOUND NO FAULTS ON #2 HF ALL OPS CHECK GOOD AND NO FAIL ON PANEL IN FLT DECK. GROUND VERIFICATION SUCCESSFUL.

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