Valve Issue Delays SLS Core Stage 'Hot Fire'

Irene Klotz February 23, 2021
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...
Irene Klotz

Irene Klotz is Senior Space Editor for Aviation Week, based in Cape Canaveral. Before joining Aviation Week in 2017, Irene spent 25 years as a wire service reporter covering human and robotic spaceflight, commercial space, astronomy, science and technology for Reuters and United Press International.

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