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Boeing on Friday formally began flight testing the 777-9 with the Federal Aviation Administration aboard, clearing a key initial milestone for the twin-jet as the plane maker progresses through its long-delayed certification, according to two people familiar with the program’s progress.
Related: TAC Explains: What is conformity in aircraft certification?
The start of flight testing with the FAA accompanied a key certification milestone known as Type Inspection Authorization, a multi-phase process that signals aspects of the design are sufficiently ready for government evaluations to ensure the aircraft meets regulatory standards.
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