# SDR HEEA0010554

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N4573B
- Make and model: Bolkms BO105S
- Aircraft serial: S673
- Engine: Allsn 250C20B
- System (JASC): [7250 · Turbine Section](https://openairdocs.org/jasc/7250)
- Part: Coupling
- Part number: 6898977
- Condition: Worn
- Location: Turb N1
- Part time: 394 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/HEEA0010554

## Discrepancy

ENGINE REMOVED DUE TO METAL.  UPON INSPECTION OF TURBINE PARTS NOTED:  WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINES (FAILED NO GO GAUGE) INSTALLED A NEW N1 COUPLING.

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