Root Cause of SpaceX Crew Capsule Explosion Found and Is Easily Fixed
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Summary
The failure of the titanium component in a high-pressure NTO environment was sufficient to cause ignition of the check valve and led to an explosion.SpaceX engineering leader Hans Koenigsmann said it was now increasingly difficult for SpaceX to expect a crewed launch of its new spacecraft in 2019.SpaceX engineers would isolate the oxidizer from the pressurization system and replace the four titanium valves with a simpler component called a burst disc.
As said here by Brian Wang