# SDR K2DA201205310001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 25, 2012
- Submitted: May 31, 2012
- Operation: Air carrier
- Aircraft: [N407WH](https://openairdocs.org/aircraft/N407WH), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53503
- Aircraft time: 7,320 hours
- Engine: Allsn 250C47B
- Engine time: 7,384 hours, 6,958 cycles
- System (JASC): [7250 · Turbine Section](https://openairdocs.org/jasc/7250)
- Part: Turbine Wheel
- Part number: 23063354
- Part serial: CAT45033
- Condition: Failed
- Location: Engine
- Part time: 4,527 hours, 4,882 cycles
- Component: Engine, Allsn
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K2DA201205310001

## Discrepancy

TURBINE RUBBING SOUND DETECTED ON SHUTDOWN.  TURBINE SECTION REMOVED FROM SERVICE FOR INSPECTION.  INSPECTION FOUND NR 1 AND NR 2 TURBINE WHEELS RUBBING DUE TO NR 2 NOZZLE WARPING.  BOTH TURBINE WHEELS AND NR 2 NOZZLE UNSERVICEABLE.

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