What Caused the SpaceX Crew Dragon Explosion?

Crew Dragon Explosion
A video posted on Twitter in April showed SpaceXs Crew Dragon capsule exploding in a ball of smoke. Weeks later, SpaceX Vice President of Mission Assurance Hans Koenigsmann confirmed during a press event that the capsule was destroyed in the accident.
And now, almost three months later, SpaceX has preliminary results to share about what it suspects caused the capsule to fail: evidence shows that a leaking component allowed liquid oxidizer nitrogen tetroxide to enter high-pressure helium tubes during ground processing, SpaceX wrote in a statement released Monday.
Leaky Valve
An engine test of twelve of the companys Draco thrusters used only for launch escape resulted in destruction of the vehicle, according to the statement. The investigation team verified the flammability of the check valve that failed and ignited.
Lessons learned from the test and others in our comprehensive test campaign will lead to further improvements in the safety and reliability of SpaceXs flight vehicles, read the statement. SpaceX has decided to replace the faulty valves with burst discs that will mitigate the risk entirely.
Lessons Learned
According to NASA head Jim Bridenstine, the Crew Dragon explosion will delay SpaceXs plans to send astronauts to the International Space Station.
There is no doubt the schedule will change, Bridenstine said at the Paris Air Show in June, according to Reuters. It wont be what was originally planned.
READ MORE: Leaky component led to SpaceX explosion [BBC]
More on SpaceX:Fire Breaks Out at SpaceX Starship Facility in Florida (source)

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