NASA says it must haul the Artemis II rocket again to the hangar for repairs

The helium system on the SLS higher stage—formally often called the Interim Cryogenic Propulsion Stage (ICPS)—carried out properly throughout each of the Artemis II countdown rehearsals. “Final night, the crew was unable to get helium move by way of the car. This occurred throughout a routine operation to repressurize the system,” Isaacman wrote.

The Area Launch System rocket emerges from the Automobile Meeting Constructing to start the rollout to Launch Pad 39B final month.

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Stephen Clark/Ars Technica

One other molecule, one other downside

Helium is used to purge the higher stage engine and pressurize its propellant tanks. The rocket is in a “protected configuration,” with a backup system offering purge air to the higher stage, NASA stated in a press release.

NASA encountered an analogous failure signature throughout preparations for launch of the primary SLS rocket on the Artemis I mission in 2022. On Artemis I, engineers traced the issue to a failed verify valve on the higher stage that wanted alternative. NASA officers should not certain but whether or not the helium challenge Friday was attributable to an analogous valve failure, an issue with an umbilical interface between the rocket and the launch tower, or a fault with a filter, in keeping with Isaacman.

In any case, technicians are unable to succeed in the issue space with the rocket on the launch pad. Contained in the VAB, floor groups will lengthen work platforms across the rocket to supply bodily entry to the higher stage and its related umbilical connections.

NASA stated transferring into preparations for rollback now will enable managers to doubtlessly protect the April launch window, “pending the end result of information findings, restore efforts, and the way the schedule involves fruition within the coming days and weeks.”

It’s not clear if NASA will carry out one other fueling check on the SLS rocket after it returns to Launch Pad 39B, or whether or not technicians will do any extra work on the fragile hydrogen umbilical close to the underside of the rocket chargeable for recurring leaks in the course of the Artemis I and Artemis II launch campaigns. Managers have been happy with the efficiency of newly put in seals throughout Thursday’s countdown demonstration, however NASA officers have beforehand stated vibrations from transporting the rocket to and from the pad might injury the seals.