# SDR 20000804SH009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 26, 2000
- Submitted: August 4, 2000
- Operation: General aviation
- Aircraft: [N407PR](https://openairdocs.org/aircraft/N407PR), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53232
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Bearing
- Part number: 407340339103
- Condition: Rough
- Location: Tail Rotor
- Component: Blower Motor
- Component part number: 407040303109
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000804SH009

## Discrepancy

TAIL ROTOR HANGER BEARINGS, P/N 407-340-339-103, HAVE BEEN FOUND ROUGH AND FAILED PREMATURELY ON MANY OCCASIONS DURING INSPECTIONS.  THE GREASE USED TO LUBRICATE THESE BEARINGS IS BEING FORCED OUT BY SUCTION CREATED BY THE OIL COOLERS ROTATING IMPELLER (FAN).  SUBMITTER SUGGESTED THE MFG OF THESE BEARINGS DEVELOP A HIGHER QUALITY OF SEAL MORE DURABLE TO RETAIN GREASE IN BEARING.  (X)

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