# SDR CA021206004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2002
- Submitted: January 6, 2003
- Operation: Air carrier
- Make and model: Cessna 208B
- Registry model: [Cessna 208B](https://openairdocs.org/model/cessna-208b) (OpenAirDocs)
- Aircraft time: 2,380 hours
- Engine: Pwa PT6A114A
- Propeller: Mcauly 3GFR34C703
- System (JASC): [3340 · Exterior Lighting](https://openairdocs.org/jasc/3340)
- Part: Switch
- Part number: MS25306222
- Condition: Shorted
- Location: Landing Light
- Stage of operation: AP
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA021206004

## Discrepancy

(CAN) ON APPROACH FLIGHT CREW COULD SMELL A BURNING ODOR IN THE COCKPIT WHEN LT LANDING LIGHT WAS TURNED ON.  MAINTENANCE FOUND THE LT LANDING LIGHT SWITCH TO HAVE A INTERNAL SHORT.  ALTHROUGH SWITCH AND THE LANDING LIGHT ITSELF STILL WORKED, IT WAS DISCOVERED THAT THE SWITCH HAD A HIGH RESISTANCE CAUSING A HIGH HEAT BUILD UP OF THE AFFIXED WIRING TO THE LANDING LIGHT  AFTER BEING TURNED ONFOR A SHORT PERIOD OF TIME. WIRING WAS INSPECTED AND SWITCH REPLACED. THE LANDING LIGHT CIRCUIT BREAKER DID NOT TRIP.

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