LOS ANGELES—The NTSB-led investigation team probing the cause of the Oct. 31 crash of Virgin Galactic’s SpaceShipTwo says 2 sec. before the vehicle began to break up in midair, its two moveable tail booms unexpectedly began to deploy into a “feathering” position. Revealing the findings, NTSB Chairman Christopher Hart says camera footage and telemetry show that around 9 sec. after ignition of the hybrid rocket, the mechanism that controls the stowage of the moving ...

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