# SDR CA011002003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 15, 2001
- Submitted: December 12, 2001
- Operation: General aviation
- Make and model: Bell 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (OpenAirDocs)
- Aircraft time: 14,291 hours
- Engine: Allsn 250C20
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Bearing
- Part number: 23034787
- Condition: Failed
- Location: M/R Gearbox
- Component: Gearbox, Rroyce, 6886442
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA011002003

## Discrepancy

(CAN) PILOT REPORTED A CHIP LIGHT & A LOUD GRINDING NOISE COMING FROM THE ENGINE REGION. THE PILOT MADE A PRECAUTIONARY LANDING TO A LANDING SIGHT. THE CHIP PLUGS WERE REMOVED & FOUND LARGE AMOUNT OF FLAKES. ON THE INVESTIGATION FOUND THE TWO AND A HALF BEARING FAILED IN THE ENGINE GEARBOX. THE GEARBOX HAS 12264.1 TSN AND 2675.0 TSO. WHEN THE 2 1/2 BEARING FAILED IT CUT A GROOVE IN THE SPUR ADAPTER GEAR SHAFT RACE.

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