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Engineers detected a liquid hydrogen leak in a quick disconnect cavity and have stopped flowing the propellant to the core stage while they troubleshoot. Launch controllers are attempting to warm up the quick disconnect to attempt to reseat it to get a tight seal. Liquid oxygen flow is continuing.

Engineers have started loading super cold liquid hydrogen into the Space Launch System rocket’s core stage and the fast fill phase for the core stage liquid oxygen tank also has started. The countdown clock, which was in a 2.5 hour built in hold, has resumed.

Engineers have started the slow fill phase of loading super cold liquid oxygen into the Space Launch System rocket’s core stage.

Artemis Launch Director Charlie Blackwell-Thompson has given the “go” to officially begin loading propellants into the Space Launch System rocket.  Tanking begins with chilldown of the core stage liquid oxygen transfer line. NASA TV coverage will begin at 5:45 a.m. http://www.nasa.gov/live.

The Artemis I Mission Management Team has given the “go” to proceed toward tanking operations. Weather conditions remain 60% favorable at the beginning of the two-hour launch window which opens at 2:17 p.m. EDT Sept. 3, with conditions improving to 80% favorable toward the later part of the window. Artemis I launch director Charlie Blackwell-Thompson …

Expedition 67 Commander Oleg Artemyev and Flight Engineer Denis Matveev, both of Roscosmos, concluded their spacewalk at 5:12 p.m. EDT after 7 hours and 47 minutes. Artemyev and Matveev completed their major objectives, which included relocating an external control panel for the European robotic arm from one operating area to another and testing a rigidizing mechanism …

Significant Items: RS Extravehicular Activity (EVA) #54A: Today, Oleg Artemyev (EV1) and Denis Matveev (EV2) performed RS EVA #54A with Sergey Korsakov supporting as the IV operator. Hatch opening occurred at 8:25 AM CT. The trio performed several tasks to configure and test the European Robotic Arm (ERA) for operations on the station’s Russian Segment. …

Following the Artemis I pre-launch briefing, meteorologists with the U.S. Space Force Space Launch Delta 45 predict a 60% chance of favorable weather conditions at the beginning of the two-hour launch window that opens at 2:17 p.m. EDT Sept 3, increasing to an 80% chance of favorable weather conditions toward the later part of the …

Expedition 67 Commander Oleg Artemyev and Flight Engineer Denis Matveev, both of Roscosmos, began a spacewalk at 9:25 a.m. EDT to continue outfitting the European robotic arm on the International Space Station’s Nauka laboratory by opening the hatch of the Poisk docking compartment airlock. Coverage of the spacewalk continues on NASA Television, the NASA app, and the agency’s website. …

NASA Television coverage is underway of today’s spacewalk with Russian cosmonauts to continue outfitting the European robotic arm on the International Space Station’s Nauka laboratory. Coverage of the spacewalk is on NASA Television’s Media Channel, the NASA app, and agency’s website. Expedition 67 Commander Oleg Artemyev and Flight Engineer Denis Matveev, both of Roscosmos, will relocate an …