# SDR HYIA20211101001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 27, 2021
- Submitted: November 1, 2021
- Operation: Air carrier
- Aircraft: [N747WS](https://openairdocs.org/aircraft/N747WS), registered now
- Make and model: Cessna 402CESSNA
- Aircraft serial: C4020080
- Aircraft time: 33,814 hours, 18,566 cycles
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Switch
- Condition: Dirty
- Location: Heater
- Stage of operation: CR
- 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/HYIA20211101001

## Discrepancy

THE PILOT REPORTED A BURNING SMELL IN CABIN DURING FLIGHT.  MAINTENANCE INSPECTED AND FOUND THE HEATER FLOW SWITCH DIRTY.  THIS WAS CLEANED AND SUBSEQUENT HEATER RUN-UPS PRODUCED NO FURTHER DEFECTS NOTED.

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