GE9X Engine Prepares for Service on Boeing 777X

GE Aerospace’s GE9X engine, capable of generating up to 134,000 pounds of thrust, has completed extensive testing and is set to enter service in 2026 on Boeing’s 777X.

GE9X Engine
©GE Aerospace

Production & Testing Milestones

GE Aerospace reveals that production of its GE9X engines has begun, with the rollout aligned to Boeing’s 777X assembly schedule. The engine, designed exclusively for the world’s largest twin-engine passenger jet, features:

  • 134-inch fan diameter, the largest of any commercial jet engine
  • Certified at 105,000 pounds of thrust, with capability up to 134,000 pounds
  • The GE9X has undergone 27,000 cycles and 17,000 hours of testing, including 1,600 dust ingestion cycles to ensure durability in arid environments.

“We’ve started building, and we’ll be aligning production with Boeing’s 777X,” said Cristina Seda-Hoelle, head of GE Aerospace’s GE9X program.

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Rigorous Testing & Sustainability Gains

The engine has completed Extended Operations (ETOPS) testing, with GE Aerospace preparing to present disassembled ETOPS data to customers by mid-2025.

“We’ve run the heck out of the engine, and customers have been really impressed by the dust test data,” said Tyler-Blair Sheppard, GE9X marketing lead.

GE Aerospace reports that the GE9X’s NOx emissions are 55% lower than regulatory limits, making it one of the most environmentally efficient engines in its class.  

At this stage, the GE9X engine has undergone more hours of endurance and flight tests than any other GE Aerospace commercial aircraft engine before entry into service.

Global Support & Future Operations

GE Aerospace is investing $1 billion over four years to expand maintenance, repair, and overhaul (MRO) capabilities for GE9X customers worldwide.

The company outlines it is also ramping up production for its lease pool program, ensuring airlines have immediate access to spare engines.

Boeing 777X
©Boeing

“When issues occur, we’ll be fully set up to support our customers and get them flying again as soon as possible,” Sheppard added.

Aviation’s Next Chapter

In what the company describes as having more endurance and flight testing than any previous GE Aerospace commercial engine, the GE9X is set to redefine efficiency and reliability upon entering service on Boeing’s 777X.

“This isn’t just cool—it’s a game changer that pushes the boundaries of technology,” said Seda-Hoelle.

Aerospace