# SDR CA991027036

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 1, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Bell 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (OpenAirDocs)
- Engine: Allsn 250C20
- System (JASC): [6310 · Engine/Transmission Coupling](https://openairdocs.org/jasc/6310)
- Part: Bearing
- Part number: 206040205005
- Condition: Failed
- Location: Freewheel Unit
- Part time: 8,039 hours
- Component: 206040230019
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA991027036

## Discrepancy

(CAN) POST-FLIGHT INSPECTION OF FREEWHEELING UNIT REVEALED THAT THE FORWARD CAP BEARING WAS FOUND IN PIECES.  FREEWHEELING THROUGH SHAFT WAS SCORED/OVERHEATED.  FOLLOWING DISASSEMBLY AT LABORATORY FOR METALLURGICAL TESTS, THE ENGINEERING REPORT STATED THAT A SMALL PARTICLE OF A PRO-SEAL WAS BLOCKING THE OIL FITTING (206-040-254-001 OR 206-040-094-001).  IT IS SUSPECTED THAT LACK OF OIL LUB CAUSED BEARING TO OVERHEAT AND FAIL.

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