# SDR 98UAL900361

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N559UA
- Make and model: Boeing 757222
- Aircraft serial: 26657
- Engine: Pwa PW2037
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Blade
- Part number: 1B7306
- Condition: Cracked
- Location: Rt Engine
- Stage of operation: CL
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98UAL900361

## Discrepancy

THREE LOUD JOLTS CAME FROM RIGHT ENGINE DURING CLIMB.  *S/D*  ENGINE WAS REPLACED AND A FAILED 6TH STAGE HPC BLADE WAS DISCOVERED AFTER ENGINE DISASSEMBLY.  THE UA INVESTIGATION FOUND THAT A 6TH STAGE BLADE HAD FAILED DUE TO FATIGUE CRACKING ORIGINATING 2/3 OF THE WAY DOWN THE CONVEX AIRFOIL MID SPAN.  THE BLADE IS BEING RETURNED TO PWA FOR INVESTIGATION.

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