# SDR CA031023007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2003
- Submitted: November 3, 2003
- Operation: General aviation
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Engine: Allsn 250C47B
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Drive Shaft
- Part number: 407040339101
- Condition: Failed
- Location: Tail Rotor
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA031023007

## Discrepancy

(CAN) PILOT HAD TAKEN OFF. SHORTLY THEREAFTER HEARD A THUMP FROM THE REAR FOLLOWED BY VIBRATION. ON REACHING FINAL DESTINATION INSPECTION REVEALED NR 5 TR DRIVE SHAFT BEARING 407-040-339-101 FAILED.OVERHEAT EVIDENCE ON THE HANGAR AND DAMAGE SUSTAINED TO THE RELATED DRIVE SHAFT SEGEMENT AS A RESULT OF WOBBLING WITHIN THE HANGAR. 3 BALLS STILL IN THE BEARING RACE  AND 6 LODGED IN THE TAIL ROTOR GEARBOX FAIRING.

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