# SDR HYIA20171113001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 8, 2017
- Submitted: November 13, 2017
- Operation: Air carrier
- Aircraft: [N763EA](https://openairdocs.org/aircraft/N763EA), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0497
- Aircraft time: 34,117 hours, 38,189 cycles
- Engine: Cont TSIO520VB
- Engine time: 1,769 hours, 2,678 cycles
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 658175A2BP
- Part serial: AC15LB093
- Condition: Damaged
- Location: Nr 6
- Part time: 1,769 hours, 2,678 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20171113001

## Discrepancy

AT CRUISE POWER SETTING, CREW REPORTED A ROUGH RUNNING RT ENGINE ALONG WITH A CONTINUOUS MODERATE VIBRATION THROUGHOUT RANGE OF POWER SETTINGS.  THE FLIGHT DIVERTED AND LANDED SAFELY.   INSPECTION REVEALED THE NR 6 CYLINDER AND PISTON ASSEMBLY WERE SEVERELY DAMAGED.  THE INTAKE AND EXHAUST VALVES DID NOT EXHIBIT SIGNS OF DAMAGE.  THE DAMAGE APPEARS TO HAVE BEEN CAUSED BY A PREIGNITION EVENT IN THE NR 6 CYLINDER.  THIS ENGINE HAS BEEN REMOVED FROM SERVICE DUE TO METAL CONTAMINATION CAUSED BY THIS EVENT.

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