# SDR HYIA2020090131001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 28, 2020
- Submitted: September 1, 2020
- 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: 402C0518
- Aircraft time: 27,010 hours
- Engine: Cont TSIO520VB
- Engine time: 8,737 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 658552A2
- Part serial: AC19DA348
- Condition: Damaged
- Location: Nr 5
- Part time: 785 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA2020090131001

## Discrepancy

PILOT REPORTED MAGNETO ROUGH IN FLIGHT.  MAINTENANCE INSPECTED AND FOUND OIL IN THE #5 CYLINDER. UPON REMOVAL OF THE CYLINDER IT WAS FOUND TO HAVE MISSING MATERIAL AT THE VALVE INTAKE GUIDE. THE #5 CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED

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