Valve Issue Delays SLS Core Stage 'Hot Fire'

SLS
An initial SLS engine firing on Jan. 16 ended after just 67 sec.
Credit: Robert Markowitz/NASA
NASA has delayed the planned Feb. 25 full-duration hot fire of the Space Launch System (SLS) core stage due to a faulty valve in the system that supplies liquid oxygen to one of the vehicle’s four Aerojet Rocketdyne RS-25 engines. The hot fire, slated to last 4-8 min., will complete an eight-part...

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