# SDR 98ZZZX4507

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 10, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N421UP](https://openairdocs.org/aircraft/N421UP), registered now
- Make and model: Cessna 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Aircraft serial: 421B0142
- Engine: Cont GTSIO520H
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Case
- Part number: 642133
- Condition: Cracked
- Location: Engine
- Part time: 2,327 hours
- 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/98ZZZX4507

## Discrepancy

CASE CRACKED BELOW NR 3 CYLINDER TOP STUD SECOND FROM THE FRONT.  FOUND DURING CYLINDER REMOVAL TO REPLACE BASE SEAL.  CRACK ABOUT .50 INCH LONG.

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