# SDR CA130910004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 2013
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Robsin R44
- Aircraft time: 3,467 hours
- Engine: Lyc O540F1B5
- System (JASC): [6720 · Tail Rotor Control System](https://openairdocs.org/jasc/6720)
- Part: Bearing
- Part number: C0311
- Condition: Worn
- Location: T/R Pitch
- Part time: 1,420 hours
- Stage of operation: LD
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA130910004

## Discrepancy

(CAN) PILOT REPORTED HEARING A WHISTLE/WHINE COMING FROM THE TAIL ROTOR ON SHUTDOWN.  UPON INSPECTION IT WAS FOUND THAT THE C031-1 T/R PITCH CHANGE BEARING HAD BLACK SMOKE COMING FROM AROUND THE BEARING CLOSEST TO THE T/R GEARBOX.  WHEN REMOVED BEARINGS WERE ROUGH AND THERE WAS MOVEMENT BETWEEN BEARING HOUSING AND THE SHAFT.

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