# SDR UIEA200200026

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 22, 2002
- Submitted: August 13, 2002
- Operation: Air carrier
- Aircraft: [N506MC](https://openairdocs.org/aircraft/N506MC), registered now
- Make and model: Boeing 747-2D3B
- Registry model: [Boeing 747-2D3B](https://openairdocs.org/model/boeing-747-2d3b) (OpenAirDocs)
- Aircraft serial: 21252
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Switch
- Part number: 8906K1563
- Condition: Inoperative
- Location: Light Panel
- Stage of operation: DE
- 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/UIEA200200026

## Discrepancy

ON DESCENT A STRONG ELECTRICAL ODOR COMING OUT OF GASPERS.  ELECTRICAL SMOKE OR FIRE CHECK LIST INITIATED.  AFTER ITEM NR 6, SMOKE STOPPED.  AIRCRAFT REMAINED IN THIS CONFIGURATION AND LANDED.  C/A: FOUND MELTED INSULATION AT WING ILLUMINATION LIGHT SWITCH TERMINAL.  LIGHT INTERMITTENTLY INOPERATIVE, PULLED CIRCUIT BREAKER.  TRANSFERRED TO DMI, MEL.  REPLACED SWITCH AND WIRE ATTACHED TO TERMINAL NR1 ON SWITCH FOR THE WING ILLUMINATION LIGHTS IAW MM.

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