# SDR 2011FA0000673

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 13, 2011
- Submitted: October 7, 2011
- Operation: General aviation
- Aircraft: [N38MD](https://openairdocs.org/aircraft/N38MD), registered now
- Make and model: Urocop AS365N3
- Registry model: [Urocop AS365N3](https://openairdocs.org/model/eurocopter-as365n3) (OpenAirDocs)
- Aircraft serial: 6335
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Bearing
- Part number: 704A33652044
- Part serial: 0117
- Condition: Failed
- Location: T/R Gearbox
- Component: Gearbox
- Component part number: 365A33600508
- 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/2011FA0000673

## Discrepancy

FAILURE OF INPUT PINION TAPERED ROLLER BEARING OF TAIL ROTOR GEARBOX.  FAILURE OCCURRED DURING GROUND RUN AFTER MX.  REPLACEMENT OF TAIL ROTOR GEARBOX.  TAIL ROTOR GEARBOX INPUT CASING DISCOLORED DUE TO OVERHEATING OF FAILED BEARING.  INPUT PINION SEIZED.

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