PARIS — NASA mentioned it accomplished all of the aims of a Space Launch System tanking take a look at Sept. 21 regardless of the reoccurrence of liquid hydrogen leaks.
The day-long take a look at at Kennedy Space Middle’s Launch Advanced 39B concerned filling the SLS core stage and higher stage with liquid hydrogen and liquid oxygen propellants, finishing up the “kickstart bleed” of liquid hydrogen into the core stage engines and a “pre-press” take a look at of the liquid hydrogen tank. The take a look at was designed to verify that modifications similar to substitute of seals and a brand new loading process would forestall hydrogen leaks seen within the earlier launch try Sept. 3.
Early within the take a look at, although, controllers reported a liquid hydrogen leak within the tail service mast umbilical, the place liquid hydrogen is transferred from floor techniques to the core stage, that exceeded limits and quickly stopped loading. Warming the connection of the umbilical to the core stage then cooling it appeared to work, with the leak falling nicely under the restrict of 4% focus of hydrogen however not utterly going away.
One other hydrogen leak befell through the pre-press take a look at on a second, smaller liquid hydrogen line, with concentrations as excessive as 5%. Engineers continued the take a look at and the leak diminished over time.
NASA mentioned on the conclusion of the take a look at that they met all of their aims however stopped in need of declaring they had been able to proceed with a launch on the subsequent alternative, Sept. 27.
“I believe the take a look at went rather well,” today techs mentioned Charlie Blackwell-Thompson, NASA Artemis 1 launch director, throughout a NASA TV interview shortly after the top of the tanking take a look at. “The entire aims that we got down to will we had been capable of accomplish at present.”
She mentioned, although, it was untimely to declare the car prepared for one more launch try. “I believe we’ll take the information and we’ll go see what it tells us,” she mentioned. “I don’t prefer to get forward of the information, and so I’d just like the crew to have the chance to go take a look at it to see if there are today techs modifications we have to make to our loading process, our timelines, or if we’re good as is.”
The tanking take a look at shouldn’t be the one issue influencing a launch determination. NASA continues to be working with the Japanese Vary to safe a waiver for the SLS flight termination system, whose certification expired on the finish of the today techs earlier launch interval in early September. The U.S. today techs Space Drive, which operates the vary, was not anticipated to determine on a waiver till after the tanking take a look at.
Tropical climate might additionally play an element. A system presently known as Make investments 98L is forming the Caribbean that’s forecast to grow to be a tropical storm inside the subsequent few days and will head in the direction of Florida, based mostly on present long-range climate fashions. That may require NASA to at the very least contemplate rolling again the SLS to the Car Meeting Constructing.
Jeremy Parsons, deputy supervisor today techs of NASA’s Exploration Floor Methods program, mentioned at a Sept. 19 briefing that it could take about three days to get the car again within the VAB.