# SDR M3XA20130726509

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 2012
- Submitted: July 26, 2013
- Operation: Air carrier
- Aircraft: [N509MT](https://openairdocs.org/aircraft/N509MT), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53281
- Aircraft time: 7,379 hours, 22,114 cycles
- Engine: Allsn 250C47B
- Engine time: 3,118 hours, 8,058 cycles
- System (JASC): [7250 · Turbine Section](https://openairdocs.org/jasc/7250)
- Part: Turbine Wheel
- Part number: 6898663
- Part serial: X589849
- Condition: Failed
- Location: Engine
- Part time: 1,098 hours, 2,030 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: F, T
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/M3XA20130726509

## Discrepancy

EXPERIENCED A LT YAW AND LOUD HOWLING/GRINDING SOUND FROM TRANSMISSION.  NO CAUTION, ADVISORY, OR WARNING LIGHTS.  LOWERED COLLECTIVE TO UNLOAD TRANSMISSION AND TO KEEP AUTO AIRSPEED, LOUD HOWL PERSISTED.   LANDED.

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