# SDR 95ZZZX6383

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 17, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N3380Q
- Make and model: Cessna 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Aircraft serial: 421B0264
- Engine: Cont GTSIO520H
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 642344RB
- Condition: Cracked
- Location: Cyls 1,2,6
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX6383

## Discrepancy

FOUND THREE CYLINDERS CRACKED BETWEEN THE SPARK PLUG AND INJECTOR HOLES.  SUBMITTER STATED CRACKS MAY BE CAUSED BY OVERTORQUING THE INJECTOR NOZZLES OR POSSIBLY EXCESSIVE VIBRATION.

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