Technology & Science

Repaired Artemis II SLS Rolls to Pad, Keeps 1 April Crew Launch on Track

After fixing helium-line and wiring issues in the Vehicle Assembly Building, NASA moved the 322-ft Artemis II Space Launch System back to Launch Complex-39B on 20 March 2026, preserving its 1-6 April launch window for the first crewed lunar fly-by since Apollo.

By Underlines Team

Focusing Facts

  1. Crawler-transporter 2 began roll-out at 12:20 a.m. EDT on 20 Mar 2026 and completed the 4-mile trip roughly 10 hours later.
  2. The unplanned rollback stemmed from a stuck upper-stage helium quick-disconnect; seals were replaced along with flight-termination batteries during the three-week VAB stay, adding about two months to the schedule.
  3. Launch simulations using NASA’s new LAVA CFD tool led engineers to reinforce pad sound-suppression structures for Artemis II.

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