POWERFUL AND EFFICIENT COMMERCIAL JET ENGINE GE9X

Developed for the Boeing 777X, the GE9X is the most fuel-efficient engine General Electric has ever produced. Compared to its predecessor, the GE90-115B, it delivers 10% better fuel efficiency. During ground testing, the engine generated 134,000 lb of thrust, setting a world record and earning a place in the Guinness World Records.

The GE9X is expected to become GE’s most economical jet engine to date, while maintaining the same world-class reliability standards as the GE90-115B. It also features significantly lower noise and NOx emissions than regulatory limits, making it an environmentally responsible powerplant. The GE9X is part of GE’s latest ecomaginationSM product line.

A Legacy Built on the GE90

Since the GE9X is an advanced evolution of the GE90, it is worth briefly reviewing its predecessor.

The GE90 first entered service in 1995, initially producing between 74,000 and 94,000 lb of thrust.

In 2002, a later version achieved 127,900 lb of thrust, breaking a world record. Its certified rating is 115,000 lb, and it still holds the title of the highest-thrust certified jet engine in commercial aviation.

The GE90 demonstrated its reliability by operating for 60 hours at triple red-line—maximum fan speed, maximum core speed, and maximum exhaust gas temperature. It was also the first commercial engine to use composite fan blades. The engine’s fan diameter is approximately the same as the fuselage diameter of a Boeing 737-800, and it has a 9:1 bypass ratio.



The World’s Largest Commercial Jet Engine

Although GE has not released an exact bypass ratio for the GE9X, it is expected to be around 10:1. The GE9X is officially recognized as the largest commercial aircraft engine in the world, with a fan diameter of 134.5 inches.

To illustrate its size: even if NBA star Shaquille O’Neal carried Kobe Bryant on his shoulders, they could still stand upright inside the fan case. The fan case is made from composite materials, and the fan blades are fourth-generation composite blades. By the time the GE9X enters full service, these composite blades will have accumulated over 100 million flight hours.

GE remains the only manufacturer using composite fan blades, although the CFM LEAP engine—produced by CFM, a joint venture between GE and Safran—also uses composite technology.

Advanced Core and Compressor Design

GE’s latest engines use a Variable Bleed Valve (VBV) system designed to expel debris entering the engine. GE calls this the “Debris Rejection System,” and it is incorporated into the GE9X to protect the core.

Low-Pressure Compressor (LPC): 3 stages

High-Pressure Compressor (HPC): 11 stages

The first five stages of the HPC use blisk (bladed disk) technology and advanced 3D aerodynamic design, delivering exceptionally high efficiency.

HPC pressure ratio: 27:1

Overall pressure ratio: 60:1

This is the highest compression ratio ever achieved in aviation history.

Lean-Burn Combustion and Emissions



The GE9X combustor uses third-generation lean-burn technology (TAPS III).

Lean-burn means a higher air-to-fuel ratio than the stoichiometric mixture, improving fuel efficiency while significantly reducing emissions.

The GE9X achieves approximately 30% margin below CAEP/8 NOx limits.

CAEP (Committee on Aviation Environmental Protection) was established by ICAO in 1983 through the merger of:

the Committee on Aircraft Noise (CAN, founded in 1970), and the Committee on Aircraft Engine Emissions (CAEE, founded in 1977)

Global Partners

The GE9X program is supported by GE’s international partners:

IHI Corporation (Japan)

Safran Aircraft Engines (France)

Safran Aero Boosters (Belgium)

MTU Aero Engines AG (Germany)

KUTU:

Revolutionary Materials

The GE9X uses Ceramic Matrix Composites (CMC) extensively—more than any previous GE engine.

CMC components include:

Combustor inner and outer liners

HPT stage-1 shrouds

HPT stage-1 and stage-2 nozzles

CMC materials provide:

2 higher durability

20% less cooling requirement

Up to one-third weight reduction

Next-Generation Manufacturing

Some compressor and turbine components are produced using powder metallurgy, where metal powders are shaped and sintered under heat and pressure. Many parts are also manufactured using 3D printing, allowing the production of complex geometries impossible with conventional methods.

Low-Pressure Turbine Innovations

The Low-Pressure Turbine (LPT) uses Titanium Aluminide (TiAl), which is stronger, more durable, and lighter than traditional nickel-based alloys.

The GE9X LPT is the largest and most efficient ever built, produced through extensively tested, refined, and optimized manufacturing processes.

Record-Breaking Performance

Despite producing 134,000 lb of thrust, the GE9X is also the quietest engine GE has ever built, operating below Stage 5 noise limits. With 10% lower fuel burn than the GE90-115B, the GE9X stands as the most efficient engine in GE’s history.