SpaceX社,Crew Dragon爆発事故の原因を発表


SpaceX said the most likely cause of the explosion was when a “leaking component” allowed nitrogen tetroxide (NTO) oxidizer into helium tubes during processing. When the system was pressurized just before the planned ignition, a “slug” of NTO was driven at high speed into a titanium check valve, causing structural failure of the valve and igniting it, triggering the explosion.