# SDR 95ZZZX1099

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N69RP](https://openairdocs.org/aircraft/N69RP), registered now
- Make and model: Beech D55
- Registry model: [Beech D55](https://openairdocs.org/model/beech-d55) (OpenAirDocs)
- Aircraft serial: TE766
- Engine: Cont IO520CB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 639272CP
- Condition: Cracked
- Location: Exhaust Port
- 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/95ZZZX1099

## Discrepancy

DURING A 200-HOUR INSPECTION ALL CYLINDERS OF LT ENGINE PASSED A DIFFERENTIAL COMPRESSION TEST.  CLOSER INSPECTION OF CLYLINDER ASSYS REVEALED CRACKS BETWEEN COOLING FINS OF SEVERAL CYLINDERS IN THE EXHAUST PORT AREA.  NOTE:  CRACKS ORIGINATING IN THIS AREA ARE NOT CHECKED DURING COMPRESSION TEST AND WILL LEAD TO CYLINDER HEAD SEPARATION IN 100 HOURS OR LESS.  SUSPECT FATIGUE/SHOCK COOLING.

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