# SDR CA130612003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2013
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Engine: Allsn 250C47B
- System (JASC): [6330 · Main Rotor Transmission Mount](https://openairdocs.org/jasc/6330)
- Part: Mount
- Part number: 407310203101
- Condition: Damaged
- Location: Transmission
- 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/CA130612003

## Discrepancy

(CAN) PILOT REPORTED A STRANGE INTERMITTENT VIBRATION.  DURING A VISUAL INSPECTION, THERE WERE CONTACT MARKS ON THE LT AFT CORNER MOUNT UP STOP/SAFETY WASHER.  UPON INSPECTION WITH THE CORNER MOUNT LIFT TOOL, THE LT AFT CORNER MOUNT WAS FOUND SEPARATED.  ALL 4 CORNER MOUNTS ARE ABLE ENGINEERING O/H COMPONENTS CHANGED TOGETHER 309.0 HOURS EARLIER.  ALL 4 MOUNTS WERE CHANGED.

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