# SDR NM1Y2021080300001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 3, 2021
- Submitted: August 3, 2021
- Operation: General aviation
- Filed by: [Safran Aircraft Engines, repair station NM1Y353K](https://openairdocs.org/faa-repair-station/NM1Y353K/safran-aircraft-engines.md) (OpenAirDocs)
- Make and model: Boeing 777
- Engine: Ge GE90110B1
- Engine time: 27,719 hours, 4,706 cycles
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Shaft
- Part number: 3511029060
- Part serial: DE038198
- Condition: Abnormal
- Location: Hpc
- Part time: 27,719 hours, 4,706 cycles
- Component: Hpc Module
- Component part number: 2115M53G08
- Stage of operation: IN
- How discovered: D
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NM1Y2021080300001

## Discrepancy

DURING THE HPC CONE SHAFT FPI INSPECTION DURING AN HPC MODULE SHOP VISIT, SAFRAN AIRCRAFT ENGINES DISCOVERED AN UNUSUAL 8 MM LONG CRACK IN THE SLOT AREA. THE TC HOLDER HAS BEEN INFORMED AND INVESTIGATIONS ARE ON-GOING.

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