# SDR IKBR20200212909

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 12, 2020
- Submitted: February 12, 2020
- Operation: General aviation
- Aircraft: [N180SU](https://openairdocs.org/aircraft/N180SU), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S12161
- Aircraft time: 946 hours
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Master Switch
- Part number: S344311
- Condition: Defective
- Location: Avionics
- Part time: 946 hours
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IKBR20200212909

## Discrepancy

ON PREFLIGHT THE PILOT NOTICED THE #2 AVIONICS FAN WAS WAS NOT COMING ON AND SMELLED A BURNING SMELL INSPECTED SYSTEM AND FOUND THE AVIONICS MASTER SWITCH P/N S3443-1-1 WAS DEFECTIVE INSTALLED NEW SWITCH.

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