Peter Siebold ( born 1971 ) is a member of the Scaled Composites astronaut team . He is their Director of Flight Operations , and was one of the test pilots for SpaceShipOne and SpaceShipTwo , the experimental spaceplanes developed by the company . On April 8 , 2004 , Siebold piloted the second powered test flight of SpaceShipOne , flight 13P , which reached a top speed of Mach 1.6 and an altitude of 32.0 kilometers . On October 31 , 2014 , Siebold and Michael Alsbury were piloting the SpaceShipTwo VSS '' Enterprise '' on flight PF04 , when the craft came apart in mid-air and then crashed , killing Alsbury and injuring Siebold
flight PF04
VSS Enterprise crash
Peter Siebold