# SDR ZN3R2015FA0000086

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 25, 2015
- Submitted: March 10, 2015
- Operation: General aviation
- Engine: Garrtt TFE73160
- Engine time: 56 hours, 39 cycles
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Bearing
- Part number: 3587591
- Part serial: 1216225530098
- Condition: Separated
- Location: Hp Compressor
- Part time: 56 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ZN3R2015FA0000086

## Discrepancy

REPAIR AND O/H FOR A METAL CONTAMINATION INSPECTION.  DISASSEMBLY FINDINGS REVEALED THE SOURCE OF THE METAL CONTAMINATION WAS THE NR 4 ROLLER BEARING.  THE BEARING EXHIBITED HEAVY SPALLING WITH DISCOLORATION IN THE FORM OF HEAT DAMAGE WITH ROLLER BEARING CAGE SEPARATION.  THE BEARING WAS SUBMITTED TO MFG PROJECT ENGINEERING FOR A MATERIAL ANALYSIS.

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