# SDR CA990308004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 20, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Engine: Cont GTSIO520L
- Propeller: Mcauly 3FF32C501
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Piston
- Condition: Failed
- Location: Engine
- Stage of operation: CL
- Nature of condition: E, J
- Precautionary procedure: E, B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA990308004

## Discrepancy

(CAN) PILOT REPORTED VIBRATION FOLLOWED BY LOSS OF OIL PRESSURE.  IN-FLIGHT SHUTDOWN CARRIED OUT. POST-FLIGHT INVESTIGATION INDICATED PISTON FAILURE DUE TO DETONATION.  FURTHER REPORT TO FOLLOW.

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