# 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.

*aerospace · news · 2026-05-07 · Simple Flying*

## Key points

- A crack in the GE9X's mid seal was discovered during a January 2026 inspection.
- 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.

**Companies:** General Electric, Boeing
**Countries:** United States, Germany

[Read the full story on Simple Flying](https://simpleflying.com/how-ge9x-134-inch-fan-creates-problems-no-other-jet-engine-faces/)

---

Canonical: https://newsio.io/n/519d1205-73cd-4cba-97c0-ecbd6a9d7be5/a-crack-in-the-general-electric-ge9xs-mid-seal-during-a-january-2026-inspection
Summarized by Newsio from Simple Flying. https://newsio.io/how-it-works