# SDR AU990416055

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Engine: Lyc TIO540J2BD
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Bolt
- Part number: 69679
- Condition: Broken
- Location: Nr 1 Cylinder
- Component: Lyc, TIO540J2BD
- Stage of operation: IN
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU990416055

## Discrepancy

(AU) OIL LEAK WAS FOUND ON THE NR 1 ENGINE DURING A PROPELLER CHANGE.  FURTHER INSPECTION FOUND A THRU-BOLT BROKEN AT NR 1 CYLINDER.  THE THRU-BOLT WAS REPLACED AND ALL CYLINDER RETAINING NUTS WERE CHECKED FOR PROPER TORQUE AND FOUND WITHIN THE LIMITS.  THE ENGINE WAS GROUND RUN SERVICEABLE AND THE AIRCRAFT RETURNED TO SERVICE.

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