# SDR 2002FA0000078

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 18, 2001
- Submitted: January 18, 2002
- Operation: General aviation
- Aircraft: [N1368U](https://openairdocs.org/aircraft/N1368U), registered now
- Make and model: Cessna 172M
- Registry model: [Cessna 172M](https://openairdocs.org/model/cessna-172m) (OpenAirDocs)
- Aircraft serial: 17267039
- Engine: Lyc O320*
- System (JASC): [3197 · Instrument System Wiring](https://openairdocs.org/jasc/3197)
- Part: Ring
- Part number: PQ876SW
- Condition: Burned
- Location: Wire
- Part time: 317 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002FA0000078

## Discrepancy

PART WAS INSTALLED AROUND TACH AND CONNECTED TO REOSTATE FOR THE INSTRUMENT LIGHTS.  IT SHORTED OUT THE SYSTEM AND BURNED OUT REOSTATE-S2091-5 AND POWER TRANSISTER 2N3055.  THIS CAUSED NO INSTRUMENT LIGHTS IN AIRCRAFT.  OWNER NOTICED NO LIGHTS AND NOTIFIED TECHNICIAN.  TROUBLESHOOTING THE SYSTEM TECH FOUND THAT WIRES ON TOP OF RING WAS TOUCHING ONE ANOTHER, CAUSING A DIRECT SHORT.

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