# SDR 2001F00578

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 10, 2001
- Submitted: October 31, 2001
- Operation: Air carrier
- Aircraft: [N687AL](https://openairdocs.org/aircraft/N687AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53366
- Engine: Allsn 250C47B
- System (JASC): [7250 · Turbine Section](https://openairdocs.org/jasc/7250)
- Part: Blade
- Part number: 23053299
- Part serial: X146539
- Condition: Missing
- Location: Engine
- Part time: 1,706 hours
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2001F00578

## Discrepancy

TURBINE RECEIVED FROM FIELD FOR HOWLING NOISE.  REMOVED COMBUSTION SECTION AND FOUND SULFADATION ON 1ST STAGE WHEEL.  WHEEL HAS MISSING AND BROKEN BLADES DUE TO SULPHADATION.  (M)

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