# SDR 98ZZZX3342

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N157AC](https://openairdocs.org/aircraft/N157AC), registered now
- Make and model: Skrsky S64F
- Aircraft serial: 64065
- Engine: Pwa JFTD12A4A
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Bearing
- Part number: 419403
- Condition: Damaged
- Location: Nr 2 Engine
- Part time: 1,449 hours
- 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/98ZZZX3342

## Discrepancy

BEARING REMOVED FROM AN ENGINE DURING REPAIR WITH A TOTAL BEARING TIME OF 1,449.4 HOURS WITH NO PREVIOUS OVERHAULS.  NO OTHER BEARING IN THE ENGINE WAS DISCREPANT.  DURING OVERHAUL, THE BEARING WAS INSPECTED AND ONE UNUSUAL CONDITION WAS FOUND:  THE BALLS EXHIBITED SEVERE SCRATCHES.  THIS IS THE SECOND BEARING EXHIBITING A MANUFACTURING DEFECT WHICH CAUSES SURFACE DAMAGE TO THE BEARING BALLS.  A PREVIOUS MDR WAS SUBMITTED ON 9-30-97 ON THE SAME PART NUMBER.  THE PREVIOUS BEARING WAS ANALYZED AND A MANUFACTURING DEFECT WAS CONFIRMED.

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