CAPE CANAVERAL—Two months after a ground test accident destroyed a SpaceX Crew Dragon capsule, the company disclosed a design flaw that allowed a slug of nitrogen tetroxide (NTO), used as an oxidizer for the capsule’s inflight and abort system engines, to slam into a titanium valve, causing it to fail and trigger an explosion when the system was pressurized. There were no injuries from the April 20 static fire test, which took place here at Cape Canaveral AFS, but the accident ...

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