# SDR 96ZZZX5006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 4, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N9538R](https://openairdocs.org/aircraft/N9538R), registered now
- Make and model: Beech K35
- Registry model: [Beech K35](https://openairdocs.org/model/beech-k35) (OpenAirDocs)
- Aircraft serial: D6094
- System (JASC): [3310 · Flight Compartment Lighting](https://openairdocs.org/jasc/3310)
- Part: Rheostat
- Part number: XR7200B
- Condition: Overheated
- Location: Inst Pnl Lights
- Stage of operation: IN
- Nature of condition: M
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX5006

## Discrepancy

ALL FOUR LIGHTING DIMMER RHEOSTAT/TRANSISTOR ASSEMBLIES WERE SUBJECTED TO EXCESSIVE HEAT DURING NORMAL OPERATION.  THERE WAS NOT A SHORTED WIRE CONDITION CAUSING THIS HEAT.  THE POTTING COMPOUND FORMING THE UNIT MELTED (DRIPPING DOWN ONTO THE FLOOR) EVENTUALLY CAUSING THE FAILURE OF THE RHEOSTAT.  SUBMITTER STATED THIS ASSEMBLY POSES A SAFETY HAZARD AND SHOULD BE REPLACED WITH ONE THAT CAN HANDLE THE LOAD AND DISSIPATE THE HEAT EFFECTIVELY.

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