# SDR AU981633

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Cessna 172P
- Registry model: [Cessna 172P](https://openairdocs.org/model/cessna-172p) (OpenAirDocs)
- Engine: Lyc O320D2J
- System (JASC): [7922 · Engine Oil Temperature Regulator](https://openairdocs.org/jasc/7922)
- Part: Nut
- Part number: 53E22144
- Condition: Loose
- Location: Engine Oil
- 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/AU981633

## Discrepancy

(AUS) ENGINE THERMOSTATIC VALVE (VERNATHERM) WAS REMOVED TO DETERMINE PART NUMBER WAS COMPLIANT WITH AD/LYC/78A5.  IT WAS FOUND THAT THE VALVE'S P/N 53E22144 WAS NOT APPLICABLE, BUT THE VALVE STILL FAILED THE INSPECTION CRITERIA - LOOSE RETAINING NUT.  NOTE:  VALVE P/N 53E22144 IS NOT MENTIONED IN SB 318A AS A PROBLEM.

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