NASA engineers held the countdown at T-40 minutes whereas troubleshooting for greater than an hour. Lastly, launch director Charlie Blackwell-Thompson known as the try a scrub. At a press convention the next day, members of the Artemis workforce advised the obvious engine problem would possibly even have been an indication of a dodgy temperature sensor. “The best way the sensor is behaving doesn’t line up with the physics of the state of affairs,” mentioned John Honeycutt, the SLS program supervisor.
The launch was then pushed again to this weekend, with countdown procedures beginning up once more early Saturday morning. Anticipating challenges with the propellants, they started the chilldown course of, together with the kickstart take a look at, about 45 minutes earlier in the course of the countdown procedures. The launch workforce and climate officer confirmed that the climate was amenable to launch, regardless of a couple of intermittent rain showers. They started filling the large orange gasoline tank with greater than 700,000 gallons of liquid hydrogen and liquid oxygen, supercooled to a frigid -423 and -297 levels Fahrenheit.
However that’s when the hydrogen leak arose, after the oxygen had been principally fueled up. “Hydrogen’s tough to work with,” mentioned Jim Free, as affiliate administrator at NASA headquarters, in the course of the post-scrub press convention. The leak appears to stem from a seal within the eight-inch fast disconnect, a becoming used for the liquid hydrogen provide line from the bottom system. Finally, it turned clear that that becoming must be eliminated and changed.
At 11:17 am Japanese time, Blackwell-Thompson made the decision to wash the launch try.
In an trade the place “house is difficult” is a cliché, such delays aren’t out of the odd, even when the climate cooperates. Throughout NASA’s house shuttle program, some finally profitable launches needed to be postponed a number of instances. With the SLS—an enormous, brand-new rocket with quite a few techniques to coordinate—the duty turns into much more formidable. NASA has 489 “launch commit standards” that should be met earlier than they are often “go” for launch, Sarafin mentioned at a press convention on September 1.
NASA could must delay the Artemis launch till mid-October, to return after SpaceX’s Crew-5 launch at a neighboring pad—which has been postponed a number of instances, too. That mission will carry two NASA astronauts, a Japanese astronaut and a Russian cosmonaut, Anna Kikina, to the Worldwide House Station. This would be the first time a Russian will fly aboard a US-made spacecraft for the reason that battle in Ukraine led to tensions between Roscosmos, NASA, and different house businesses.
The workforce continues to be contemplating whether or not repairs could be made on the launch pad, or if the rocket have to be rolled again to the Car Meeting Constructing. “There’s a threat versus threat tradeoff,” mentioned Sarafin, noting that maintaining the rocket on the pad exposes it to environmental dangers, however that the fast disconnect seal can’t be examined at cryogenic temperatures contained in the constructing.
A rollback itself will not be with out dangers, for the reason that movement and vibrations can put stress on the rocket. However to reduce put on and tear, the rocket would transfer no sooner than one mile per hour on a machine known as “the crawler.” That rollback choice would guarantee a delay till late October, which might additionally pose dangers for the small spacecraft aboard the rocket, meant for their very own mini missions. These spacecraft, known as CubeSats, have batteries with restricted energy—a few of them could be recharged, however others can’t. “If we have to roll again to the Car Meeting Constructing, we will prime off the batteries for various these,” Sarafin mentioned on the press convention. “It’s a part of the method of taking a look at a given launch interval.”
Nelson emphasised that Artemis 1 is a take a look at flight, and mentioned that as we speak’s pushback will not be anticipated to have an effect on the general timeline for this system, which goals to ship astronauts into lunar orbit aboard Artemis 2 in 2024, and to land them on the moon aboard Artemis 3 in 2025. (That moon touchdown mission could slip to 2026, nonetheless, based on a March evaluation by the NASA Inspector Basic.)
Whereas the Artemis workforce wished to launch as we speak, NASA officers harassed that the rocket is in good situation, and that they’re assured that they’ll be capable to launch safely within the close to future. “We’re not the place we wish to be, besides the automobile is protected—it isn’t protected in orbit, it is protected on the bottom,” Free mentioned.