# SDR HYIA202005222004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 7, 2020
- Submitted: May 22, 2020
- Operation: Air carrier
- Aircraft: [N751CA](https://openairdocs.org/aircraft/N751CA), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: C4020217
- Aircraft time: 20,747 hours
- Engine: Cont TSIO520VB
- Engine time: 2,440 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 658552A2
- Part serial: AC18ED042
- Condition: Damaged
- Location: Nr 3
- Part time: 752 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA202005222004

## Discrepancy

PILOT REPORTED A STRONG VIBRATION IN FLIGHT. MAINTENANCE INSPECTED AND FOUND THE LEFT ENGINE #1 CYLINDER TO HAVE LOW COMPRESSION AND THE #3 AND #4 CYLINDERS TO HAVE DAMAGE AT THE ROTOCOIL. ALL THREE CYLINDERS WERE REPLACED WITH NO FURTHER DEFECTS NOTED.

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