# SDR 96ZZZX2556

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N413TC](https://openairdocs.org/aircraft/N413TC), registered now
- Make and model: Piper PA-31-325
- Registry model: [Piper PA-31-325](https://openairdocs.org/model/piper-pa-31-325) (OpenAirDocs)
- Aircraft serial: 317912040
- System (JASC): [7922 · Engine Oil Temperature Regulator](https://openairdocs.org/jasc/7922)
- Part: Valve
- Part number: 77944
- Condition: Crimp Nut Gone
- Location: Thermo Bypass
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX2556

## Discrepancy

ON REMOVAL TO C/W SB 518C, FOUND NUT HAD FALLEN OFF OF VALVE, SPRING AND SEAT WERE SEPARATED FROM VALVE WITH NUT LODGED IN OIL PASSAGE FROM VALVE.  THE ONLY CONTAMINANTS IN OIL FILTER WAS SOME BRASS FROM THE SEAT WORKING AGAINST NUT.

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