# SDR CA961007013

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Mtsbsi MU2B36
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Sun Gear
- Part number: 8681942
- Condition: Fractured
- Location: Transmission
- Part time: 10,490 hours
- Stage of operation: NR
- Nature of condition: E, J
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA961007013

## Discrepancy

(CAN) PILOT NOTED SEVERE VIBRATION WITH NO WARNING.  PRIOR TO SHUTDOWN, THE TORQUE WENT TO ZERO.  AIRCRAFT RETURNED OK.  INSPECTION REVEALED THE PLANETARY PIN P/N 868051-1 WAS CHAFED BY THE PLANETARY GEAR P/N 358268-1 WHICH IN TURN ABNORMALLY LOADED THE SUN GEAR WHICH SUBSEQUENTLY FAILED.

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