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Boeing resumed flight testing of the 777-9

Boeing has resumed testing of the 777-9 after stopping earlier this year due to an unspecified problem with its GE Aerospace GE9X engine. The planemaker confirms that testing has resumed, and flight-tracking websites show that a 777-9 from Boeing's test fleet took off on December 17. "We have resumed testing of the aircraft following our exhaustive safety process and appropriate mitigation measures, while our suppliers and technical teams continue their work. We are supporting GE Aerospace as they continue to evaluate a recent GE9X engine issue," Boeing told FlightGlobal. GE Aerospace states that it "continues to work closely with Boeing on all requirements necessary to support the 777X flight test program." Boeing does not confirm when the tests resumed, but the FlightAware flight tracking website shows that the first 777-9, registration N779XW, took off on December 17. The plane departed from Seattle's Boeing Field, flew east to Montana, and then returned to Boeing Field, landing approximately 1h 40min later. The plane made a similar flight two days later, on December 19. Prior to these flights, none of the 777-9s had flown in months, according to Aircraft Tracking Services. According to FlightAware, one of these planes last flew in August, another in July, and the last in November 2021. Late last month, Boeing and GE confirmed that they had put the 777-9 flight test program on hold due to what General Electric called a "technical issue that occurred during post-certification engineering testing of the engine." GE9X». The engine manufacturer added that the problem affected its "older" GE9X, an engine that had accumulated more than 1,700 operating hours and more than 2,600 flight cycles. The 777-9 program remains delayed due to intensified certification controls by the US Federal Aviation Administration. Boeing plans to deliver the first of its kind in 2025. The company says it continues to "transparently communicate progress to our customers and regulators."

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