# SDR HEEA116166

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 1, 2007
- Submitted: July 2, 2007
- Operation: Air carrier
- Aircraft: N412SM
- Make and model: Bell 412
- Registry model: [Bell 412](https://openairdocs.org/model/bell-412) (OpenAirDocs)
- Aircraft serial: 33197
- Aircraft time: 4,350 hours
- Engine: Pwa PT6*
- System (JASC): [7921 · Engine Oil Cooler](https://openairdocs.org/jasc/7921)
- Part: Bearing
- Condition: Failed
- Location: Cooler  Blower
- Component: Blower
- Component part number: 212062514101
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HEEA116166

## Discrepancy

IN CRUISE FLIGHT THE AIRCRAFT EXPERIENCED A RHYTHMIC BUT INTERMITTENT VIBRATION.  MAINTENANCE FOUND ONE OIL COOLER BLOWER TO HAVE BAD BEARINGS AND CHIPPED BLADES.  REPLACED OIL COOLER BLOWER.

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