# SDR 2018FA0000508

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2018
- Submitted: December 11, 2018
- Operation: General aviation
- Aircraft: [N605SR](https://openairdocs.org/aircraft/N605SR), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C1041
- Engine: Cont GTSIO520N
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Pressure Switch
- Part number: 94E421
- Condition: Failed
- Location: Heater
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2018FA0000508

## Discrepancy

IN SPITE OF NO REQUIREMENT TO TEST THIS PRESSURE SWITCH.  FOUND THIS PRESSURE SWITCH FAILED IN THE CLOSED POSITION.

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