# SDR ASAA12511426

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 18, 2012
- Submitted: April 20, 2012
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 14,282 hours, 4,553 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [2310 · HF Communications System](https://openairdocs.org/jasc/2310)
- Part: Hf Comm
- Condition: Malfunctioned
- Stage of operation: TX
- 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/ASAA12511426

## Discrepancy

NO SIDE TONE TRANSMITTING ON HF 2 FROM EITHER CONTROL HEAD.  SELCAL CHECK RECEIVES OK ON BOTH HF 1 & 2.  RECEPTION OK ON BOTH HF 1 & 2. ACFT GROUNDED. PERFORMED HF SYS BITE PROCEDURE FIM 23-11-00-810-801. OPS CHECKED NORMAL. GROUND VERIFICATION OF HF 2 TRANSMIT CHECKED NORMAL. OK TO CONTINUE.

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