# SDR 2023FA0000260

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 14, 2023
- Submitted: May 14, 2023
- Operation: General aviation
- Aircraft: [N993JE](https://openairdocs.org/aircraft/N993JE), registered now
- Engine: Iae V2533A5
- Engine time: 20,034 hours, 3,948 cycles
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Drum
- Condition: Cracked
- Location: Engine
- Component: 9-12 Drum, Iae, V2533A5
- Component part number: 6A7546
- Stage of operation: IN
- How discovered: B
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2023FA0000260

## Discrepancy

CRACK IDENTIFIED IN THE 9-12 DRUM (LLP). ENGINE SN V18736 WAS INDUCTED FOR INVESTIGATION OF HIGH N2 VIBRATION AND PERFORMANCE LOSS. THIS IS A FIRST RUN ENGINE WITH NO PRIOR SHOP VISITS FROM NEW. DURING THE DISASSEMBLY AND INVESTIGATION OF THE HPC THE CHCEC HAS DISCOVERED A CRACK IN THE 9-12 DRUM AT THE MATING FLANGE TO THE HPC REAR SHAFT. THE CRACK IS RUNNING APPX 50% OF THE CIRCUMFERENCE OF THE DRUM AND CHCEC BELIEVES THIS IS THE CAUSE OF THE HIGH N2 VIBRATION.

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