# SDR HEEA076814

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2001
- Submitted: November 12, 2001
- Operation: General aviation
- Aircraft: N4999
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53323
- Aircraft time: 2,724 hours
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Shaft
- Condition: Failed
- Location: Cooler Blower
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HEEA076814

## Discrepancy

IN CRUISE, AIRCRAFT DEVELOPED SEVERE VERTICAL VIBRATION.  FOUND FORWARD BEARING ON NR 2 TAIL ROTOR OIL COOLER BLOWER SHAFT FAILURE.

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