# SDR 20010601CW004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2001
- Submitted: June 1, 2001
- Operation: General aviation
- Aircraft: [N70AP](https://openairdocs.org/aircraft/N70AP), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53409
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Bearing
- Part number: 407340339103
- Condition: Seized
- Location: Tail Rotor
- Part time: 786 hours
- Stage of operation: CR
- 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/20010601CW004

## Discrepancy

PILOT FELT EXCESSIVE VIBRATION AND HEADED BACK TO BASE, AFTER SHORT PERIOD VIBRATION INCREASED, PILOT LANDED IN FIELD.  FOUND TAIL ROTOR HANGER BEARING SEIZED AND SPUN IN BEARING HOUSING.  THE BEARING THAT FAILED IS THE FIRST BEARING AFT LOCATED JUST FORWARD OF OIL COOLER BLOWER.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.