# SDR 8172007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 17, 2007
- Submitted: August 22, 2007
- Operation: Air carrier
- Aircraft: N199WA
- Make and model: Beech B-99
- Registry model: [Beech B-99](https://openairdocs.org/model/beech-b-99) (OpenAirDocs)
- Aircraft serial: U154
- Aircraft time: 34,380 hours, 66,399 cycles
- System (JASC): [3310 · Flight Compartment Lighting](https://openairdocs.org/jasc/3310)
- Part: Transistor
- Part number: 2N3055
- Condition: Failed
- Location: Cockpit
- Part time: 34,380 hours, 66,399 cycles
- Component: Light Panel, Bcraft
- Component part number: 11536401229
- Stage of operation: DE
- 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/8172007

## Discrepancy

DURING DESCENT ON FLIGHT 1045 (BGR-MHT) THE PILOT ACTIVATED THE OVERHEAD PANEL LIGHT SWITCH.  WITHIN 60 SECOND THE PILOT NOTED A BURNING ODOR (ELECTRICAL) BUT COULD NOT IDENTIFY THE SOURCE.  THE PILOT CONTINUED THE APPROACH AND LANDING WITHOUT INCIDENT BUT BY THE TIME THE PILOT WAS READY TO TAXI THE SMOKE WAS NOTICEABLE IN THE COCKPIT.  THE PILOT TAXIED AND PARKED THE AIRCRAFT WITHOUT INCIDENT AND CONTACTED MAINTENANCE CONTROL.  MAINTENANCE ISOLATED THE PROBLEM TO THE SW PANEL FAILING WHICH POPPED THE CIRCUIT BREAKER.  MAINTENANCE COLLARED THE C/B, RAN THE AIRCRAFT AND ELECTRICAL SYSTEMS WITH NO OTHER DEFECTS NOTED.  THE LIGHTING WAS DEFERRED IN ACCORDANCE WITH MEL 33-1.  FURTHER TROUBLESHOOTING REVEALED A FAUL

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