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A crack in the General Electric GE9X’s mid seal during a January 2026 inspection could easily be framed as just another technical hurdle in the long development story of the Boeing 777X.
A crack in the GE9X's mid seal was discovered during a January 2026 inspection.
KEY POINTS
- The GE9X's 134-inch fan size creates unprecedented thermal and mechanical stresses on internal engine components.
- General Electric has redesigned the mid seal rather than repaired it, indicating conditions exceeded original expectations.
- No other commercial engine faces similar mid seal issues, due to the GE9X's uniquely large fan and high-pressure core.
- Ongoing refinements are required post-certification because the GE9X operates closer to material performance limits than previous engines.
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