Tag: SLS

NASA called off today’s attempt to launch its Space Launch System rocket due to a hydrogen leak encountered during the process of fueling up the core stage.

The next opportunity for liftoff could come on Sept. 5 or 6, but NASA hasn’t yet decided the timing for the third launch attempt.

NASA’s uncrewed test mission, known as Artemis 1, is meant to blaze a trail for sending astronauts to the moon.

“We’ll go when it’s ready,” NASA Administrator Bill Nelson said. “We don’t go until then, and especially now, on a test flight, because we’re going to stress this and test it … and make sure it’s right before we put four humans up on the top of it. So, this is part of the space business.”

Today’s scrub at Kennedy Space Center in Florida came five days after an initial postponement, which was attributed to concerns about the procedure for cooling down the SLS’s rocket engines prior to launch.

One day after the first launch of NASA’s heavy-lift Space Launch System rocket had to be scrubbed due to an engine cool-down issue, mission managers announced that they’d try again on Sept. 3. In the meantime, engineers will work out the details of a go/no-go plan, just in case they face issues similar to those that forced this week’s scrub.

Sept. 3’s two-hour launch opportunity opens at 2:17 p.m. ET (11:17 a.m. PT) at NASA’s Kennedy Space Center in Florida. If all systems are go, liftoff would mark the beginning of NASA’s Artemis 1 mission, an uncrewed test flight aimed at setting the stage for sending astronauts to the lunar surface in the mid-2020s.

A plumbing issue on a rocket engine has forced a postponement in the first launch of NASA’s most powerful rocket on a history-making round-the-moon flight.

NASA’s Space Launch System rocket went far into the fueling process for today’s start of the uncrewed Artemis 1 mission, which is meant to test all the systems that will come into play during crewed missions to the moon.

During the countdown, engineers detected a problem with one of the core stage’s four rocket engines. The rocket is designed to “bleed off” some of its supercooled propellant to condition its engines — basically, to maintain the engines at the proper temperature for startup. But the hydrogen bleed procedure wasn’t working properly for engine No. 3.

Engineers tried various techniques to free up the plumbing snag, and NASA called an unplanned hold at T-minus-40 minutes to give them more time to come up with a fix. But in the end, mission managers decided to scrub the launch for today.

More than 100,000 people are expected to overwhelm Florida’s Space Coast on Aug. 29 to watch NASA’s most powerful rocket lift off on a history-making Artemis 1 mission to the moon and beyond — but if you can’t make it in person, watching the launch online may well be the next best thing.

NASA’s Space Launch System rocket is scheduled to blast off from Kennedy Space Center’s Launch Complex 39B at 8:33 a.m. ET (5:33 a.m. PT), at the start of a two-hour launch window. Forecasters say there’s an 80% chance of acceptable weather at the beginning of the window, declining to 60% by the end.

No significant problems have turned up during the countdown, senior test director Jeff Spalding said today. “We are prepared for anything,” he told reporters. But if weather or technical issues force a postponement, Sept. 2 and 5 are the backup dates for launch.

Streaming video coverage is set to begin at 9 p.m. PT tonight on NASA TV with commentary on the SLS fueling operation. The coverage goes into full swing at 3:30 a.m. PT. (Check out the full schedule.)

The Artemis 1 mission calls for the first-ever SLS launch to send an uncrewed Orion spacecraft on a 42-day test flight that features a wide-ranging lunar orbit, coming as close as 62 miles to the moon and ranging as far as 40,000 miles beyond the moon. That will set a distance record for any spacecraft designed to carry astronauts.

At the end of the mission, the Orion capsule will come screaming back to Earth at 25,000 mph, heading for a Pacific Ocean splashdown. One of Artemis 1’s prime objectives is to test the performance of Orion’s heat shield at atmospheric re-entry temperatures ranging as high as 5,000 degrees Fahrenheit.

NASA and its commercial partners have been working toward this flight for more than a decade. Artemis 1 represents the first real-world test of the SLS-Orion system, setting the stage for Artemis 2’s crewed round-the-moon flight in the 2024 time frame and Artemis 3’s crewed moon landing in 2025 or 2026.

If all goes according to plan, NASA could launch its heavy-lift Space Launch System rocket on its first flight around the moon by as early as Aug. 29.

That’s a big “if,” however: Workers at Kennedy Space Center in Florida still have to finish fixing and testing the rocket’s systems, including components that didn’t get fully checked out during last month’s launch rehearsal.

Cliff Lanham, senior vehicle operations manager for NASA’s Exploration Ground Systems Program, said it’ll be tricky to finish up the final test while observing all the launch constraints currently in place. “We do have some challenges right now as we complete that test and all our final closeout work, particularly in the core stage intertank, to get to a point where we’re ready to roll out,” he said today.

Today’s announcement came on an auspicious day: the 53rd anniversary of the Apollo 11 moon landing.

The schedule calls for the 322-foot-tall, 3.5 million-pound rocket to roll out from the space center’s Vehicle Assembly Building on Aug. 18. That would set the stage for potential launch attempts on Aug. 29, Sept. 2 and Sept. 5. Liftoff would mark the start of NASA’s Artemis 1 mission, an uncrewed test flight that’s meant to blaze a trail for astronauts to land on the lunar surface by as early as 2025.