# SDR NM1Y2019021100001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 11, 2019
- Submitted: February 11, 2019
- Operation: Air carrier
- Filed by: [Safran Aircraft Engines, repair station NM1Y353K](https://openairdocs.org/faa-repair-station/NM1Y353K/safran-aircraft-engines.md) (OpenAirDocs)
- Make and model: Boeing 777381ER
- Engine: Ge GE90115B
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Seal
- Condition: Damaged
- Location: Compressor
- Part time: 21,277 hours, 3,650 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NM1Y2019021100001

## Discrepancy

DURING ROUTINE ENGINE SHOP VISIT, THE 2-5 SPOOL FROM ENGINE  WAS FOUND WITH A STG 1 SEAL TEETH MISSING FRAGMENT.
NO ABNORMAL ENGINE RUNNING CONDITION WERE REPORTED BY THE CUSTOMER BEFORE ENGINE INDUCTION IN OUR SHOP. THE ENGINE WAS REMOVED FOR SCHEDULED HIGH-TIME ENGINE REMOVAL FOR FULL PERFORMANCE RESTORATION SV.  DECIDED TO LAUNCH AN HARDWARE INVESTIGATION TO IDENTIFY THE ROOT CAUSE OF SUCH MISSING FRAGMENT OCCURRENCE.

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