General Electric says the production ramp-up of GE9X engines for Boeing’s 777-9 is resuming, following the faster-than-expected test and validation of fixes to the durability problem that forced the airframe-maker to delay the big twinjet’s first flight to early 2020. The rapid retrofit schedule, which was put in place after durability issues were uncovered on a ground-test engine in June, will enable Boeing to stay on track toward a likely first-flight attempt in January. Three ...

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