Boeing’s 777X program has become one of aviation’s most talked-about development sagas. It is, probably, the most long-awaited aircraft, both among the airlines and our readers. With delays extending well beyond the original entry-into-service timeline, hampered by issues around other Boeing aircraft, attention has turned to its robust test-fleet strategy. Why does Boeing need five separate 777X prototypes to carry the program through to certification? In our article, you will discover the specific role each aircraft plays and how they support everything from flight-envelope testing to electromagnetic-interference resilience.
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