# SDR 2012FA0000433

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 2012
- Submitted: June 25, 2012
- Operation: General aviation
- Aircraft: [N523R](https://openairdocs.org/aircraft/N523R), registered now
- Make and model: Dhavxx DH82AROBRTSN
- Aircraft serial: 82960
- Aircraft time: 3,472 hours
- Engine: Dhavxx GIPSYMAJOR1C
- Engine time: 683 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Bolt
- Condition: Failed
- Location: Cylinder Head
- Stage of operation: CR
- How discovered: O
- Nature of condition: Y
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2012FA0000433

## Discrepancy

ROUGH RUNNING ENGINE DURING POWER TRANSITION FROM CLIMB TO CRUISE.  PILOT PERFORMED A FORCED LANDING INTO A FIELD.  INVESTIGATION REVEALED A CLAMPING BOLT WHICH ATTACHES THE ROCKER BRACKET TO CYLINDER HEAD NR 4 HAD FAILED.  NTSB ACCIDENT NUMBER WPR12LA275.

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