A version of this article appears in the July 14 edition of Aviation Week & Space Technology. Engine development has always been the pacing item in aircraft development, but as powerplant manufacturers strive to meet the increasingly ambitious performance targets of the next-generation Boeing twins, the pressure is greater than ever for early test success. This is no more keenly felt than by General Electric, which is developing the GE9X as the sole-source engine for Boeing’s new ...

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