# SDR ASAA2021081435698

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 14, 2021
- Submitted: August 17, 2021
- Operation: Air carrier
- Aircraft: [N474AS](https://openairdocs.org/aircraft/N474AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40715
- Aircraft time: 23,028 hours, 7,307 cycles
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Warning Message
- Condition: False Activation
- Location: Nr 1 Hf Comms
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021081435698

## Discrepancy

HF1 INDICATES "FAIL" ON COMM DISPLAY PANEL. GROUNDED - YES. PERFORMED HF1 COMM SYSTEM BITE PROCEDURES REF B737-900 FIM 23-11 TASK 801, OPS CHECK TEST GOOD. NO HISTORY FOR THE LAST 30 DAYS.

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