The General Electric GE9X is a large high-bypass turbofan developed for the Boeing 777X. It received FAA engine certification in September 2020. The programme extends GE's experience from the GE90 and GEnx into an engine with a larger fan and increased pressure ratio, designed around the requirements of the new 777X airframe.[1]GE9X engine achieves FAA certificationGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details[2]GE9X engineGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details
Fan and airflow
The GE9X has a 134-inch fan with sixteen composite blades. GE lists an approximate bypass ratio of 10:1 and an overall pressure ratio around 60:1. Behind the fan are three booster stages and an eleven-stage high-pressure compressor. The turbine arrangement comprises two high-pressure stages and six low-pressure stages. The engine's large airflow system is a central element of its efficiency strategy.[2]GE9X engineGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details
Performance objective
GE designed the engine for approximately ten-percent lower specific fuel consumption than the GE90-115B. A ground-test result of 134,300 lbf established a commercial-engine thrust record, but that test achievement describes demonstrated output rather than a universal installed operating rating. GE also emphasises reduced noise and emissions as objectives of the new design.[2]GE9X engineGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details[1]GE9X engine achieves FAA certificationGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details
Certification campaign
FAA Part 33 certification involved nine test engines, which accumulated just under 5,000 hours and 8,000 cycles. At the September 2020 announcement, GE reported that eight flight-test engines and two spares had been delivered for Boeing's four 777X test aircraft. Additional endurance work addressed extended-operation approval and preparation for airline service.[1]GE9X engine achieves FAA certificationGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details
Industrial and service preparation
IHI, Safran Aircraft Engines, Safran Aero Boosters and MTU participated in the GE9X programme. GE also developed maintenance training using a dedicated engine at its Cincinnati education centre. Training topics included line maintenance, borescope inspection, repairs and fan-stator work, with virtual and augmented-reality material intended to supplement practical instruction. These preparations accompanied the engine's transition from certification testing toward aircraft support.[1]GE9X engine achieves FAA certificationGE Aerospace · geaerospace.com · Accessed 2026-09-13Open source details