# SDR 99ZZZX4693

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 1, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N7452A](https://openairdocs.org/aircraft/N7452A), registered now
- Make and model: Cessna 172
- Registry model: [Cessna 172](https://openairdocs.org/model/cessna-172) (OpenAirDocs)
- Aircraft serial: 29552
- Engine: Cont O300A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Rocker Arm
- Part number: 639615
- Condition: Failed
- Location: Nr 6 Cylinder
- Part time: 3,750 hours
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX4693

## Discrepancy

NR 6 CYLINDER EXHAUST ROCKER ARM FAILED ON TAKEOFF, INBOARD SECTION CRACKED AT PUSHROD END OIL FEED HOLE AND APPROXIMATELY 180 DEGREES FROM THAT HOLE.  PART IS MAGNETIZED.

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