# SDR 2002FA0000175

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2002
- Submitted: February 6, 2002
- Operation: General aviation
- Aircraft: [N8939Z](https://openairdocs.org/aircraft/N8939Z), registered now
- Make and model: Cessna 310G
- Registry model: [Cessna 310G](https://openairdocs.org/model/cessna-310g) (OpenAirDocs)
- Aircraft serial: 310G0039
- Engine: Cont IO470D
- System (JASC): [8500 · Engine (Reciprocating)](https://openairdocs.org/jasc/8500)
- Part: Engine
- Part number: IO470D
- Part serial: 1051367DR
- Condition: Failed
- Location: 5&6 Cylinders
- Part time: 2,642 hours
- Stage of operation: IN
- How discovered: O
- Nature of condition: E
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002FA0000175

## Discrepancy

WHILE PERFORMING A STATIC GROUND RUN, AT APPROX. 2200 RPMS THE ENGINE SHOOK VIOLENTLY.  THE ENGINE WAS QUICKLY SHUT DOWN AND FUEL SHUT-OFF VALVE SELECTED TO THE OFF POSITION.  CLOSE INSPECTION OF THE ENGINE REVEALED THAT THE NR 6 CYLINDER HAD SEPARATED FROM THE ENGINE.  THE NR 5 CYLINDER WAS JAMMED WITH THE PISTON CONNECTING ROD SEVERED IN HALF.  THE FORWARD ENGINE CASE WAS CRACKED IN SEVERAL PLACES EXPOSING BOTH NR 5 AND NR 6 CYLINDER ASSEMBLIES INNER MECHANISM AND CRANKSHAFT.  RECOMMENDATIONS ARE TO REMOVE ENGINE AND SUBMIT IT TO A TEARDOWN INSPECTION ALONG WITH A METALLURGIC EVALUATION ON THE INTERNAL PARTS FOR FAILURE.  IN PARTICULAR, THE NR 5 CYLINDER CONNECTING ROD AND FORWARD ENGINE CASE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.