# SDR 96ZZZX5561

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 1, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N98PJ](https://openairdocs.org/aircraft/N98PJ), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C0824
- Engine: Cont GTSIO520L
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Bolt
- Part number: 537750
- Condition: Failed
- Location: Nr 4 Cyl Exh Rkr
- Stage of operation: NR
- Nature of condition: E, R, K
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX5561

## Discrepancy

NR 4 CYLINDER ROCKER SHAFT BOLTS BROKE. LOOSE ROCKER PUNCHED A HOLE THROUGH VALVE COVER.  ROUGH RUNNING AND SMOKE IS REASON FOR IN-FLIGHT SHUT DOWN.

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