Valve Issue Delays SLS Core Stage 'Hot Fire'

By Irene Klotz Feb 23, 2021
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.

SLS Core Stage Hot Fire Shuts Down Early

By Irene Klotz Jan 16, 2021
NASA did not immediately say why the hot fire was cut off about 67 sec. after ignition.