# SDR AC2R2016050903

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2016
- Submitted: May 9, 2016
- Operation: General aviation
- Filed by: [Chevron USA, Production Company Aviation Maintenan, repair station AC2R685K](https://openairdocs.org/faa-repair-station/AC2R685K/chevron-usa-production-company-aviation-maintenan.md) (OpenAirDocs)
- Aircraft: [N639NA](https://openairdocs.org/aircraft/N639NA), registered now
- Make and model: Agusta AW139
- Registry model: [Agusta AW139](https://openairdocs.org/model/agustawestland-philadelphia-aw139) (OpenAirDocs)
- Aircraft serial: 41326
- Aircraft time: 2,565 hours
- System (JASC): [6220 · Main Rotor Head](https://openairdocs.org/jasc/6220)
- Part: Damper
- Part number: 3G6220V01352
- Part serial: 2591
- Condition: Weak
- Location: Main Rotor
- Part time: 1,460 hours
- Stage of operation: CR
- 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/AC2R2016050903

## Discrepancy

WEAK M/R DAMPER CAUSED ENGINE TORQUE MISCOMPARE.  CAUSED BY VIBRATION.

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