# SDR UPS08M52617

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 2, 2008
- Submitted: July 15, 2008
- Operation: Air carrier
- Aircraft: [N252UP](https://openairdocs.org/aircraft/N252UP), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48768
- System (JASC): [3340 · Exterior Lighting](https://openairdocs.org/jasc/3340)
- Part: Switch
- Part number: 5D0108117
- Condition: Shorted
- Location: Cockpit
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS08M52617

## Discrepancy

SHOWER OF SMOKE AND SPARKS WAS EMITTED FROM THE RUNWAY TURNOFF LIGHT SWITCH WHEN TOUCHED.  CB "R LDG AND TAXI LIGHT" POPPED.  FOUND SWITCHES S1-9090 AND S1-9091 TOUCHED CONNECTION ON SW1-236 WHICH CAUSED SPARKS AND BURN MARKS.  R/R S1-236 IAW WDM 33-42-01. R/R S1-9090 IAW WDM 33-43-01. OPS CHECK OK. CB'S RESET. S1-9091 LT WING & RUNWAY TURNOFF LIGHT.

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