Check valves normally allow fluids to flow through in only one direction, so it came as a surprise to SpaceX to learn that a slug of liquid oxidizer made it through a valve in a Crew Dragon capsule’s helium pressurization system, triggering an explosion that destroyed the test capsule and delaying a key crew flight test to the International Space Station (ISS). NASA is counting on SpaceX and Boeing to begin crew ferry flights to the ISS as soon as possible, though program managers ...


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