# SDR WI52003F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 27, 2003
- Submitted: July 29, 2003
- Operation: Air carrier
- Aircraft: [N111AM](https://openairdocs.org/aircraft/N111AM), registered now
- Make and model: Cessna 525
- Registry model: [Cessna 525](https://openairdocs.org/model/cessna-525) (OpenAirDocs)
- Aircraft serial: 5250113
- Engine: Wilint FJ441A
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Diffuser
- Part number: 54861
- Part serial: AU00156
- Condition: Ruptured
- Location: Engine
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WI52003F00000

## Discrepancy

UPON ENGINE DISSASSEMBLY THE DIFFUSER WAS FOUND TO EXHIBIT A SEPARATION OF THE AXIAL WELD OF THE PRESSURE CASE.  THE FAILURE WAS INITIATED AS A FATIGUE CRACK WHICH RUPTURED AFTER REACHING A 3.00 INCH CRITICAL LENGTH.  CAUSE IS ATTRIBUTED TO LOCAL MATERIAL THINNING IN THE WELD HEAT AFFECTED ZONE.  TO ADD AN ANNEAL CYCLE AND TO REDUCE THE ALLOWABLE WELD MISMATCH IN THIS AREA.

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