NASA has resolved the issue that caused the Artemis II rocket to be removed from its launch pad last month. However, officials anticipate it will take a few weeks before the vehicle can return to its starting position at the Kennedy Space Center in Florida.
The towering 322-foot (98-meter) rocket had the potential to launch earlier following the success of a critical fueling test on February 21. During this test, NASA successfully loaded the Space Launch System rocket with super-cold propellants without encountering major issues, effectively addressing a persistent hydrogen leak that previously delayed the early February launch.
Nevertheless, a new complication emerged just a day after the successful fueling demonstration. Ground crews could not flow helium into the rocket's upper stage. Unlike the core stage, where connections can be repaired directly at the launch pad, the umbilical lines to the higher-up upper stage are only accessible from within the Vehicle Assembly Building (VAB) at Kennedy.
Mission managers promptly decided to roll the rocket back to the assembly building for further investigation. The rocket returned to the VAB on February 25, and within a week, engineers identified the cause of the helium flow issue. Inspections found that a seal in the quick disconnect, a conduit for helium from ground systems into the rocket, was obstructing the passage, NASA reported.
NASA provided an update emphasizing that the issue has been addressed: “The team removed the quick disconnect, reassembled the system, and began validating the repairs to the upper stage by running a reduced flow rate of helium through the mechanism to ensure the issue was resolved.” Engineers are now evaluating what caused the seal to become dislodged to prevent future occurrences.