[cityhantam]

https://time.com/6167537/sls-rehearsal-nasa/

NASA's Mega Moon Rocket Is Flunking Its Dress Rehearsal

As NASA reports in an admirably candid blog, the last 15 days out at launchpad 39B have involved one headache after another, with serial breakdowns repeatedly forcing the countdown to be stopped. Among the most serious problems is a stuck helium valve on the rocket’s second stage that has prevented that stage from being loaded with fuel. The problem can’t be repaired on the pad, but only back in the VAB—meaning that even if the rest of the work went perfectly, the wet-dress rehearsal would still not be run to its planned completion.

And the rest of the work is by no means going perfectly. Among the other problems to beset the giant rocket over the past two weeks: a liquid hydrogen leak in one of the vehicle’s umbilical cords; temperature fluctuations in the supercold liquid oxygen fuel which must be kept at -182º C (-297º F); and a troubling pressure surge in the liquid hydrogen flow line. All of this has prevented ground controllers from loading the liquid hydrogen tank to more than just 5% of its capacity and the liquid oxygen tank to more than 49%.

[cityhantam]

拜登糗大了！不料中俄有后手，美国大受刺

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[cityhantam]

https://news.yahoo.com/nasa-officials-st...13987.html

NASA officials give an update on the status of Artemis-I test, launch

NASA’s Artemis I Moon rocket is now back at the Vehicle Assembly Building for repairs after a faulty valve canceled last week’s wet dress rehearsal.

Officials said the SLS rocket and Orion spacecraft will return to launchpad 39-B once the repairs are made.

Jim Free with NASA said rolling the SLS back to the VAB was the right call in order to make the necessary fixes.


“Right now, we’re looking at the next wet dress in the early to the mid-June time frame we may update that as the other work progresses,” Free said.

Teams have already begun replacing a faulty upper stage check valve and are trying to pinpoint the root cause of the failure before testing the new valve.


“We inspected the valve and did find a small piece of rubber that was preventing the check valve from sealing correctly and we are looking for the source of where that debris could have come from,” Free said.

Until teams are able to demonstrate the ability to load propellant into the SLS tanks and conduct a full launch countdown an actual launch date for Artemis -I will remain up in the air.


NASA officials said the earliest possibility for the test will be sometime in August.