# SDR HYIA20190515002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 12, 2019
- Submitted: May 15, 2019
- Operation: Air carrier
- Aircraft: [N68752](https://openairdocs.org/aircraft/N68752), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: C4020518
- Aircraft time: 25,884 hours
- Engine: Cont TSIO520VB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 658552A2
- Part serial: AC15GB640
- Condition: Failed
- Location: Nr 4
- Part time: 2,324 hours
- Component: Engine, Cont, TSIO520VB
- Component part number: TSIO520VB
- Stage of operation: CL
- How discovered: O
- Nature of condition: E
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20190515002

## Discrepancy

PILOT REPORTED A ROUGH ENGINE; "MISSING" WHEN PROPS BROUGHT BACK FOR CRUISE AND STRONG VIBRATIONS ON FINAL APPROACH. MAINTENANCE INSPECTED AND FOUND THE LEFT ENGINE NR 4 CYLINDER EXHAUST VALVE GUIDE TO HAVE PLAY, THE EXHAUST VALVE CHIPPED, AND THE EXHAUST VALVE LIFTER FAILED. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.

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