# SDR 99ZZZX4058

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 1, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N4320F](https://openairdocs.org/aircraft/N4320F), registered now
- Make and model: Piper PA-28-151
- Registry model: [Piper PA-28-151](https://openairdocs.org/model/piper-pa-28-151) (OpenAirDocs)
- Aircraft serial: 287715016
- System (JASC): [3452 · ATC Transponder System](https://openairdocs.org/jasc/3452)
- Part: Transponder
- Part number: AT50U
- Condition: Malfunctioned
- Location: Cockpit
- Component: Narco, 47971
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX4058

## Discrepancy

TRANSPONDER MALFUNCTIONS, MODE-C INOPERABLE.

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