GE9X

Overview

The GE9X is GE Aerospace's most technologically advanced commercial engine, developed as the exclusive powerplant for the Boeing 777X family. Its 134-inch (3.404 m) composite fan is the largest ever fitted to a commercial jet engine — wider in diameter than the fuselage of the Boeing 737 — enabling a bypass ratio of 10:1 and world-class propulsive efficiency. The GE9X achieves an overall pressure ratio of 60:1, the highest ever achieved in a production commercial engine, through an 11-stage high-pressure compressor mated to an advanced two-stage high-pressure turbine using third-generation CMC (ceramic matrix composite) components throughout the combustor and turbine section.

The GE9X represents the pinnacle of GE Aerospace's four-decade progression from the CF6 through the GE90 and GEnx. It delivers approximately 10% better fuel burn than the GE90-115B and 5% better than any other engine in its thrust class. The GE9X features the most extensive use of CMC in any commercial engine: CMC combustor liners, CMC HPT stage-1 shrouds, and CMC HPT stage-2 shrouds — CMC parts weigh approximately one-third of their metallic equivalents, run at higher temperatures without cooling air, improving efficiency. The 16-blade composite fan uses an advanced aerodynamic profile developed in partnership with NASA.

Technical Specifications

Variants

The GE9X family is planned in two primary thrust ratings. The GE9X-105B1A (105,000 lbf) is the launch variant for the 777-9, certificated by the FAA in September 2020. The GE9X-105B1B incorporates further aerodynamic refinements and durability improvements. A lower-thrust GE9X-90B variant is planned for the smaller 777-8 variant, pending Boeing's 777-8 program launch decision. All variants share the same fan system, composite nacelle, and CMC-intensive hot section — the thrust differences are achieved through turbine and nozzle calibration. GE Aerospace has also leveraged GE9X technologies for the US Air Force's CFM RISE (Revolutionary Innovation for Sustainable Engines) demonstrator program, targeting 20% further fuel reduction beyond LEAP.

Aircraft Applications

• Boeing 777-9: GE9X-105B1A (105,000 lbf) — world's largest twin-engine commercial aircraft, folding wingtips, up to 426 passengers in typical two-class layout

Development History

GE launched the GE9X program in 2013 following Boeing's 777X launch. The first GE9X-105B1A test run occurred in April 2017 at Peebles — only 51 months from program launch to first run, a GE record for a large engine. FAA certification was awarded in September 2020 following an extensive flight test campaign aboard Boeing's GE9X flying testbed (a 747-400 testbed aircraft). However, the 777X program itself encountered multiple delays: structural test failures, the COVID-19 pandemic impact on widebody demand, and FAA certification scrutiny following the 737 MAX accidents pushed 777X entry into service from 2020 to 2025. Emirates is the 777-9 launch customer with an order for 115 aircraft. The GE9X's entry into service will mark the beginning of the end for GE90 new production, with MRO and aftermarket support for the GE90 fleet continuing through the 2040s and beyond.