# SDR 98ZZZX2471

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 17, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N2944W](https://openairdocs.org/aircraft/N2944W), registered now
- Make and model: Bell 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (OpenAirDocs)
- Aircraft serial: 748
- Engine: Allsn 250C20B
- System (JASC): [7250 · Turbine Section](https://openairdocs.org/jasc/7250)
- Part: Tie Bolt
- Part number: 23008020
- Condition: Failed
- Location: Turbine 2nd Stg
- Part time: 1,246 hours
- Component: 6898735
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX2471

## Discrepancy

DURING AN ACCIDENT INVESTIGATION ON A BELL 206B2 CONVERTED TO B3, NOTED THE ENGINE TURBINE, 2ND STAGE WHEEL FLY-AWAY DAMAGING THE HELICOPTER FUSELAGE.  FURTHER INVESTIGATION REVEALED THE TIE-BOLT BROKE ABOUT .25 INCH FROM THE THREADED AREA.  THE TIE-BOLT WAS REPLACED PER CEB 1212 DURING THE TURBINE HEAVY MAINTENANCE INSPECTION.  TO PREVENT RECURRENCE, SUBMITTER SUGGESTED THIS TIE-BOLT BE GIVEN A THOROUGH INSPECTION.  FOR SIGN OF CORROSION AND CRACKS, USE FLUORESCENT PENETRANT INSPECTION METHOD AT TURBINE HEAVY MAINTENANCE INSPECTION OR WHENEVER THE GAS PRODUCER TURBINE IS REMOVED FOR ANY REASON.

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