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Peter Siebold (born 1971) is a member of the Scaled Composites astronaut team. He is their Vice President of Flight Operations, and was one of the test pilots for SpaceShipOne and SpaceShipTwo, the experimental 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 . 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.
Siebold was responsible for the simulator, navigation system, and ground control system for the SpaceShipOne project at Scaled. Although he was one of four qualified pilots for SpaceShipOne, Siebold did not pilot the craft during the flights later in 2004 to meet the requirements of the Ansari X Prize. Although Siebold flew SpaceShipOne to an altitude of , he did not cross the 100 km Kármán line—the international standard for reaching space.
For his contribution to the SpaceShipOne project, Siebold, along with Mike Melvill and Brian Binnie, received the 2004 Iven C. Kincheloe Award presented by the Society of Experimental Test Pilots.
Siebold became the Director of Flight Operations at Scaled. He was the pilot who flew the White Knight Two on its maiden flight on December 21, 2008. He won the Iven C. Kincheloe Award a second time in 2009, this time individually, for his work on the first WhiteKnightTwo, VMS Eve, as chief test pilot.
Siebold's flight suit was saturated with blood from bleeding in his right arm. He did not feel any lower body injuries. As Siebold removed his parachute harness a "clunking noise" was felt in his chest and Siebold became concerned about a potential spinal fracture. Upon arrival at the ER his flight suit was cut away.
Siebold experienced a non-compound four-part fracture of his right humerus. The ball of his ankle was also dislocated and fractured. He had a non-displaced fracture of his right clavicle, a small gash in his right elbow (source of the blood on his flight suit), a deep scrape on his right wrist, and multiple scrapes on the back of his right shoulder. There was considerable bruising on his right chest but he did not know how it occurred. He did not recall any bruising on his left side. He had an abrasion under his chin which he felt was consistent with the location of his chin strap, and had multiple contusions and scrapes on his face. He was diagnosed with corneal scratches and doctors removed a piece of fiberglass from his left eye during a hospital stay. The eyes did not improve so he saw an ophthalmologist after being discharged. The ophthalmologist removed some foreign matter from his left eyelid and a "silver sliver" from his right cornea. His eyes improved immediately post procedure.
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