Orion helium leak no threat to Artemis II reentry, but will require redesign

"The leak is not to space. It's internal to the system across some of our valves, and we really need to characterize that to see what, if any, modifications we might need to make in the future."

"All of our burns have performed nominally."

Orion's Artemis II mission has encountered a helium leak in the propulsion system, necessitating new valves. Despite this issue, the mission has largely proceeded smoothly, with few changes to the flight plan since the lunar flyby on April 1. Ground controllers adjusted the timeline to prioritize testing the propulsion system instead of a planned piloting demonstration. The leak is internal and has not impacted the propulsion system's performance, as all burns have been nominal. The service module will be jettisoned before reentry.

Read at Ars Technica