# SDR 2020FA0000122

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2019
- Submitted: February 4, 2020
- Operation: General aviation
- Aircraft: [N3019S](https://openairdocs.org/aircraft/N3019S), registered now
- Make and model: Robsin R22
- Aircraft serial: 4150
- Engine: Lyc O360J2A
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Mount
- Part number: A6531
- Condition: Damaged
- Location: M/R Gearbox
- Stage of operation: NR
- 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/2020FA0000122

## Discrepancy

PILOT REPORTED 2 PER VIBRATION.  INSPECTION FOUND RUBBER SURROUNDING STEEL BUSHING ON ONE OF FOUR MAIN GEAR BOX MOUNTS HAD FAILED ALLOWING EXCESS MOVEMENT OF MAIN ROTOR DRIVE SYSTEM.

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