The first full GE9X development engine, which is the world’s largest commercial aircraft engine, has commenced ground testing at GE Aviation’s Peebles Testing Operation in Ohio. The GE9X engine will power Boeing’s new 777X jetliner. “The entire GE9X team—from engineering to sourcing to supply chain to development assembly—devoted countless hours to enable this achievement to occur,” said Bill Millhaem, general manager of the GE90/GE9X engine programs at GE Aviation. “The ground testing will generate data on the full engine system and aerodynamic performance, mechanical verification, and aero thermal system validation.” Approximately 700 orders have been placed for the 100,000 pound thrust class GE9X and maturation testing for the engine started around five years ago. The First Full Engine to Test (FETT) brings all the GE9X technologies together to demonstrate their operability as a complete propulsion system. 2017 will see the commencement of certification testing and flight testing on GE Aviation’s flying test bed for the GE9X and engine certification is anticipated in 2018.