# SDR M3XA2013073000003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 29, 2013
- Submitted: July 30, 2013
- Operation: Air carrier
- Aircraft: [N407SM](https://openairdocs.org/aircraft/N407SM), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53289
- Aircraft time: 6,976 hours, 30,035 cycles
- Engine: Allsn 250C47B
- Engine time: 6,242 hours, 16,365 cycles
- System (JASC): [6220 · Main Rotor Head](https://openairdocs.org/jasc/6220)
- Part: Bearing
- Part number: 407310101105
- Part serial: LK15458
- Condition: Delaminated
- Location: Main Rotor Hub
- Part time: 1,104 hours
- Component: Hub, Bell
- Component part number: 407010100115FM
- Stage of operation: AA
- How discovered: O
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/M3XA2013073000003

## Discrepancy

DURING FLIGHT,  EXPERIANCED A MAIN ROTOR VIBRATION, PRECAUTIONARY LANDING MADE.  NORMAL SHUTDOWN.  MX INSPECTED AND FOUND SHEAR BEARING ON MAIN ROTOR HEAD DELAMINATING.

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