# SDR 2021FA0000400

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2021
- Submitted: December 15, 2021
- Operation: General aviation
- Aircraft: [N4346J](https://openairdocs.org/aircraft/N4346J), registered now
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: None
- Condition: None
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2021FA0000400

## Discrepancy

ADSB INOP ON MULTIPLE AIRCRAFT USING THIS SYSTEM. THERE’S NO ANNUNCIATION THAT IT’S NOT WORKING, SO USUALLY DISCOVERED BY ACCIDENT MONTHS AFTER UNSAFE OPERATION. MANUFACTURER REFUSES TO DO ANYTHING ABOUT IT

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