# SDR 2010FA0000839

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 11, 2010
- Submitted: August 19, 2010
- Operation: General aviation
- Aircraft: [N221GH](https://openairdocs.org/aircraft/N221GH), registered now
- Make and model: Piper PA-32R-300
- Registry model: [Piper PA-32R-300](https://openairdocs.org/model/piper-pa-32r-300) (OpenAirDocs)
- Aircraft serial: 32R7680502
- Aircraft time: 3,946 hours
- Engine: Lyc TIO540*
- Propeller: Hartzl HCC2YR1
- System (JASC): [6114 · Propeller Hub Section](https://openairdocs.org/jasc/6114)
- Part: O-Ring
- Part number: C33171151
- Condition: Broken
- Location: Prop Hub
- Part time: 28 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2010FA0000839

## Discrepancy

PILOT REPORTED LOSS OF CONTROL OF PROPELLER CAUSING MOMENTARY OVERSPEED WHICH FORCED THE PILOT TO USE THE THROTTLE TO GAIN CONTROL.  DISASSEMBLY OF PROPELLER REVEALED INTERNAL OIL LEAK CAUSING A HYD LOCK WITH THE BLADES AT FINE PITCH. FURTHER INVESTIGATION OF THE SEALS REVEALED FAULTY O-RING IN THE REAR OF THE HUB OF THE PROPELLER. O-RING WAS RETURNED TO THE MFG FOR THEIR ANALYSIS.

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