Powered Flight 4 of Scaled Composites’ VSS Enterprise departed Mojave Air and Space Port beneath WhiteKnightTwo on October 31, 2014. About 13 seconds after airborne release, premature feather unlocking led to uncommanded feather extension and aerodynamic overload; the vehicle broke up near Koehn Dry Lake. Co-pilot Michael Alsbury was killed and pilot Peter Siebold was seriously injured.
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