Obituaries: Sean Parlaman. Ashland Daily Tidings
Retrieved 15 August 2018 – via Twitter. Kharpal, Arjun (6 March 2018). “SpaceX launches its largest satellite so far which is nearly the size of a bus”. Clark, Stephen. “Falcon 9 launch timeline with Hispasat 30W-6”. Spaceflight Now. Graham, William (5 March 2018). “SpaceX conducts 50th Falcon 9 launch with heavy Hispasat deployment”. 2 March 2018). “Confirmed by range: 12:33 a.m.” (Tweet). 6 April 2018. Retrieved 6 April 2018. SpaceX will not attempt to recover Falcon 9’s first stage after launch. Clark, Stephen (6 March 2018). “Hefty Hispasat satellite rides SpaceX rocket into orbit”. Retrieved 2 March 2018 – via Twitter.
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Subsequent investigations traced the cause of the accident to the failure of a strut that secured a helium bottle inside the second-stage LOX tank. With the helium pressurization system integrity breached, excess helium quickly flooded the tank, eventually causing it to burst from overpressure. After pausing launches for months, SpaceX launched on 22 December 2015, the highly anticipated return-to-flight mission after the loss of CRS-7. NASA’s independent accident investigation into the loss of SpaceX CRS-7 found that the failure of the strut which led to the breakup of the Falcon-9 represented a design error. Specifically, that industrial grade stainless steel had been used in a critical load path under cryogenic conditions and flight conditions, without additional part screening, and without regard to manufacturer recommendations.
