Artemis I Moon mission update: NASAKennedy will conduct a modified “wet dress rehearsal” in preparation for launch with tanking operations no earlier than April 14. NASA_SLS and NASA_Orion will then return to the Vehicle Assembly Building:
testing is slated to resume with call to stations on Tuesday, April 12 and tanking on Thursday, April 14. Wet dress rehearsal is an opportunity to refine the countdown procedures and validate critical models and software interfaces. The modified test will enable engineers to achieve the test objectives critical to launch success.
Engineers have identified a helium check valve that is not functioning as expected, requiring these changes to ensure safety of the flight hardware. Helium is used for several different operations, including purging the engine, or clearing the lines, prior to loading propellants during tanking, as well as draining propellant.
A check valve is a type of valve that allows liquid or gas to flow in a particular direction and prevents backflow. The helium check valve is about three inches long and prevents the helium from flowing back out of the rocket. Following the modified test, the Space Launch System rocket and Orion spacecraft will return to the Vehicle Assembly Building where engineers will evaluate the valve and replace if needed.NASA will host a teleconference to discuss details on Monday, April 11. Check back at this blog for an update on the countdown timeline prior to the modified wet dress rehearsal testing for the Artemis I mission.
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