Flight-testing the world’s largest engine requires precise control and a thorough buildup approach, says GE Flight Test Operations chief test pilot Jon Ohman. “We leveraged our GE90 knowledge going into the campaign and went up to NASA Ames [Research Center] to use the agency’s [Boeing] 747-400 developmental research simulator, which could simulate the effects of the thrust and weight of GE9X in the No. 2 [inboard left-wing] position. So by the time we got into the ...

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