# SDR 2016FA0000038

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2015
- Submitted: January 28, 2016
- Operation: General aviation
- Aircraft: [N3308Q](https://openairdocs.org/aircraft/N3308Q), registered now
- Make and model: Cessna 320D
- Registry model: [Cessna 320D](https://openairdocs.org/model/cessna-320d) (OpenAirDocs)
- Aircraft serial: 320D0108
- Engine: Cont TSIO520B
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Piston Ring
- Part number: AEC631397
- Condition: Broken
- Location: Nr 2 Cylinder
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2016FA0000038

## Discrepancy

NR 1 AND NR 2 TOP RING LAN FAILURE.  ENGINE LOSS OF COMRESSION.  FOUND LOOKING AT TOP OF PISTON FROM ABOUT 7 O`CLOCK POSITION TO 11 O`CLOCK RING LAN MISSING AND BROKEN RINGS.  OPERATION AT 11,000 FT, 68 PERCENT POWER ENGINE DEVELOPED A VIBRATION.  POSSIBLE DEFECTIVE PISTON.

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