# SDR 2017FA0000480

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 7, 2017
- Submitted: September 7, 2017
- Operation: General aviation
- Aircraft: [N420FP](https://openairdocs.org/aircraft/N420FP), registered now
- Make and model: Diamon DA 40
- Registry model: [Diamon DA 40](https://openairdocs.org/model/diamond-aircraft-ind-da-40) (OpenAirDocs)
- Aircraft serial: 40FC020
- Aircraft time: 4,962 hours
- Engine: Lyc O360A4M
- Engine time: 478 hours
- Propeller: Snsnch 76EM8
- System (JASC): [2134 · Cabin Pressure Sensor](https://openairdocs.org/jasc/2134)
- Part: Pressure Switch
- Part number: 0986344077
- Part serial: 0
- Condition: Failed
- Part time: 1,201 hours
- 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/2017FA0000480

## Discrepancy

PRESSURE SWITCH FAILED THAT CONTROLS THE HOBBS METER AND THE FAILURE ALLOWED OIL TO FLOW OUT OF THE ENGINE. THE PROBLEM WAS FOUND DURING A PRE-FLIGHT INSPECTION OF THE AIRCRAFT. ESTIMATED THAT THE AIRCRAFT WOULD HAVE 1GT OF OIL AN HOOUR OR MORE WITH THE OIL LOSS THAT DID OCCUR.

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