# SDR ASAA2021072635534

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 26, 2021
- Submitted: July 28, 2021
- Operation: Air carrier
- Aircraft: [N517AS](https://openairdocs.org/aircraft/N517AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35197
- Aircraft time: 45,668 hours, 13,366 cycles
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Satcom
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021072635534

## Discrepancy

BOTH SATELLITE PHONES SUCCESSFULLY COMPLETE AND RECEIVE CALLS BUT PILOT TRANSMISSIONS OVER BOTH CHANNELS ARE INOPERATIVE. AUDIO QUALITY FROM RECIPIANTS IS CLEAR & NORMAL. INBOUND CALLS ANSWER NORMALLY. GROUNDED - YES. ACCOMPLISHED CYCLING OF SATCOM CB. ACCOMPLISHED SATCOM 1&2 CALL AND RECEIVED CALL WITH LOUD AND CLEAR REPORTS. LOG SHOWS SIGNAL STRENGTH 4 OUT OF 5. REF B737-800 AMM 23-15-00-730-801. GROUND VERIFICATION CHECKED GOOD.

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