# SDR 98ZZZX3021

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N9RZ](https://openairdocs.org/aircraft/N9RZ), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C0236
- Engine: Cont GTSIO520L
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Bolt
- Part number: 537750
- Condition: Broken
- Location: Nr 3 Cyl Rocker
- Stage of operation: CR
- Nature of condition: K
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX3021

## Discrepancy

LEFT ENGINE DEVELOPED OIL LEAK IN-FLIGHT.  RETURNED TO BASE WITH NO PROBLEMS.  FOUND HOLE IN NR 3 CYLINDER VALVE COVER.  REMOVED VALVE COVER AND FOUND BOTH ROCKER SHAFT RETAINING BOLTS BROKEN. TIME ON PARTS SINCE ASSEMBLY AFTER REPAIR, 96.6 HOURS.

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