A leaky valve caused a SpaceX crew capsule to explode during a ground test back in April, destroying the spacecraft and dealing a blow to the company's effort to launch astronauts. SpaceX's crew Dragon capsule had just returned, minus astronauts, from a successful test flight to the International Space Station and was undergoing a ground test April 20 at Cape Canaveral Air Force Station. Hans Koenigsmann, a SpaceX vice president, said a check valve allowed a slug of liquid oxidizer to leak into the high-pressure abort system.
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