GE Aviation has started the 18-month certification program for the GE9X engine that will exclusively power the Boeing 777X. The first round of certification tests will take place in Peebles, Ohio. The certification testing is beginning on the second GE9X engine GE has built; ultimately, there will be eight certification test engines. The next two GE9X engines are currently being built. One of those two engines will be tested in flight on GE’s 747 flying testbed based in Victorville, ...

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