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GE9X Engine Redesign May Not Delay Boeing 777X

September 18, 2026

2 min read

Key Takeaways

GE Aerospace redesigns GE9X mid-seal after durability issue.
Redesigned seal begins shipping to Boeing.
FAA approval process underway.
Boeing 777X certification work continues.

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Strategic Implications

The GE9X redesign may indicate a significant step towards resolving engine issues, which could positively impact the Boeing 777X program timeline. However, the certification process suggests that the aircraft's entry into service may still be subject to delays, which could affect airline fleet plans and the overall competitiveness of the 777X in the market.

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What Happened

Engine Maker Delivers Major Update On Redesigned Seal

GE Aerospace has completed internal testing of a redesigned mid-seal for the GE9X engine, which powers the Boeing 777X, and has begun shipping engines with the new seal to Boeing. The redesign addresses a durability issue discovered earlier in 2026, and while it may not delay the 777X beyond its existing 2027 target, the program still faces significant certification milestones. The Boeing 777X has faced repeated schedule changes and engine-related problems, but the latest update from GE suggests progress towards resolving the GE9X issue. This development was first reported by Aviation A2Z.

Source | Originally Published: September 18, 2026

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