# SDR CA011130006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 24, 2001
- Submitted: February 5, 2002
- Operation: General aviation
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft time: 2,473 hours
- Engine: Allsn 250C47B
- System (JASC): [6500 · Tail Rotor Drive System](https://openairdocs.org/jasc/6500)
- Part: Bearing
- Part number: 407340339103
- Condition: Failed
- Location: Fan Shaft
- Component: Fan Shaft, Bell, 407040303101
- 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/CA011130006

## Discrepancy

(CAN) WHILE ON 5TH SCENIC TOUR OF DAY, AT 2,500 FT ASL IN QUIET MODE CRUISE, A/C SOUND & VIBRATION LEVEL SUDDENLY CHANGED FROM NORMAL TO LOUD WITH HEAVY VIBRATION FROM TAIL ROTOR DRIVE AREA.  PILOT IMMEDIATELY RETURNED A/C TO NORMAL MODE CRUISE RPM & EXITED SCENIC ROUTE. HE RETURNED DIRECTLY TO MAIN BASE AT PQ3 WITH PRECAUTIONARY LDG & SHUTDOWN WITHOUT FURTHER INCIDENT. TAIL ROTOR CONTROL AUTHORITY NEVER LOST.  AFTER ENGINE SHUTDOWN, INSPECTION REVEALED A COMPLETELY FAILED FWD FAN SHAFT BEARING WITH DISINTEGRATED BEARING CAGE.

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