June 6 Set for Artemis I Moon Rocket to Roll for Next Tanking Test

The Space Launch System (SLS) rocket and Orion spacecraft are targeted to return to launch pad 39B at NASA’s Kennedy Space Center in Florida on June 6, for the next wet dress rehearsal attempt ahead of the Artemis I mission.  First motion is currently slated for 12:01a, the morning of the 6th   with tanking operations to begin no earlier than June 19.

The rehearsal is the final test needed before launch and calls for NASA to load propellant into the rocket’s tanks, conduct a full launch countdown, demonstrate the ability to recycle the countdown clock, and drain the tanks to practice the timelines and procedures that will be used for launch.

While inside the Vehicle Assembly Building (VAB), teams completed several major objectives, including assessing the liquid hydrogen system leak at the tail service mast umbilical, replacing the interim cryogenic propulsion stage (ICPS) gaseous helium system check valve and support hardware, and modifying the ICPS umbilical purge boots. The addition of hazardous gas detectors above the upper stage allows for additional visibility into any potential leaks during cryogenic operations.

The hatches, or access points, of the crew module and launch abort system are now closed in preparation for rollout. Engineers installed rain gutters on the crew access area to help prevent moisture from entering the crew module while the spacecraft and rocket are at the launch pad. Teams have started retracting the service platforms that surround the Moon rocket and spacecraft in the VAB for rollout configuration ahead of their return to the launch pad.

NASA will provide livestream views the rollout of the SLS rocket and Orion spacecraft from VAB and arrival at launch 39B. For more information about the launch availability, click here.

Artemis I Rocket, Spacecraft Prepare for Return to Launch Pad to Finish Test

Since returning to the Vehicle Assembly Building (VAB), ground systems teams have worked to prepare the Artemis I Space Launch System (SLS) rocket and Orion spacecraft to roll back to Launch Pad 39B in late May to complete the wet dress rehearsal test in the early to mid-June timeframe.

Inside the VAB at NASA’s Kennedy Space Center, engineers replaced a faulty helium check valve on the interim cryogenic propulsion stage that was identified after the second wet dress rehearsal attempt. Engineers have inspected the valve and found a small piece of rubber that prevented the valve from sealing correctly. Teams are looking at possible sources of the debris, but did not see any issues with the valve itself, and plan to test the newly installed valve later this week to confirm it is operating as expected.

Engineers also performed tests to address a hydrogen leak on one of two tail service mast umbilicals between the mobile launcher and the rocket. These umbilicals provide liquid oxygen and liquid hydrogen propellants, as well as electrical connections, from the mobile launcher to the rocket’s core stage during the launch countdown. Teams conducted leak checks on all the joints and tightened several flange bolts, or fasteners that act as a washer to increase the compression strength, that can loosen over time and were the most likely source of the leak. Teams re-tightened the flange bolts on the liquid hydrogen, liquid oxygen, and core stage intertank umbilicals. Engineers have not detected leaks in subsequent testing at ambient air temperature, and will continue to monitor for leaks when loading the super cold propellants at the launch pad.

The supplier that provides gaseous nitrogen for operations during tanking is upgrading its facility to meet the requirements for the next wet dress rehearsal attempt and the Artemis I launch. Teams are on track to complete the work early next week, followed by testing to ensure the system is ready for tanking. During the test, teams pump gaseous nitrogen into dry structures to protect avionics during propellant loading.

Once all major work is completed, teams will retract the working platforms and prepare the integrated SLS rocket and the Orion spacecraft for the second journey to the launch pad. NASA will announce dates for roll to the pad and the next wet dress rehearsal attempt once work is nearing completion inside the VAB.

Artemis I Moon Rocket Arrives at Vehicle Assembly Building

At approximately 6 a.m. ET Tuesday, NASA’s Space Launch System (SLS) rocket and Orion spacecraft for the Artemis I mission arrived at the Vehicle Assembly Building (VAB) at Kennedy Space Center after a 10-hour journey from launch pad 39B that began at 7:54 p.m. ET Monday, April 25. 

Over the next several days, the team will extend the work platforms to allow access to SLS and Orion. In the coming weeks, teams will work on replacing a faulty upper stage check valve and a small leak within the tail service mast umbilical ground plate housing, and perform additional checkouts before returning to the launch pad for the next wet dress rehearsal attempt.   

NASA’s Artemis I Moon Rocket to Depart Launch Pad 39B Today

Crawler-transporter 2 (CT-2) makes its way along the crawlerway to Launch Complex 39B at NASA’s Kennedy Space Center in Florida. In view atop the mobile launcher on the pad are the Artemis I Space Launch System (SLS) and Orion spacecraft. Credit: NASA/Ben Smegelsky

At approximately 5:30 p.m. ET today, NASA’s Artemis I Moon rocket atop the crawler-transporter is scheduled to leave launch pad 39B and begin its 4-mile trek to the Vehicle Assembly Building (VAB) at NASA’s Kennedy Space Center in Florida. 

Once inside the VAB, teams will work on replacing a faulty upper stage check valve and a small leak within the tail service mast umbilical ground plate housing on the mobile launcher while the supplier for the gaseous nitrogen makes upgrades to their pipeline configuration to support Artemis I testing and launch. Following completion, teams will return to the launch pad to complete the next wet dress rehearsal attempt. 

The NASA Kennedy Twitter account will release an update once the roll has begun. Watch a live stream of the rocket departing the pad and arriving at VAB on the Kennedy Newsroom YouTube channel and check back here for updates.

NASA’s Artemis I Rocket Readying for Return to Vehicle Assembly Building

Wildflowers frame a view of the Artemis I Space Launch System (SLS) and Orion spacecraft on Launch Pad 39B
Wildflowers frame a view of the Artemis I Space Launch System (SLS) and Orion spacecraft on Launch Pad 39B at NASA’s Kennedy Space Center in Florida. Credit: NASA/Ben Smegelsky

Teams at NASA’s Kennedy Space Center in Florida are preparing the Space Launch System (SLS) rocket and Orion spacecraft for their return to the Vehicle Assembly Building (VAB) early next week. As work continues at the launch pad throughout the weekend, we will also continue working closely with our commercial crew partners to confirm a date and time. The transition is underway to move from the testing configuration to the roll back formation needed to return to the VAB. This process includes offloading hydrazine from the twin solid rocket boosters and disconnecting the rocket and spacecraft from the ground systems infrastructure at the launch pad. The core stage propellant was drained shortly after completing the last test attempt. The rocket and spacecraft remain in a safe configuration and will soon be placed atop the crawler-transporter for the 4-mile trek to the VAB.

Inside the VAB, engineers will repair a faulty helium check valve and a hydrogen leak on the mobile launcher while the supplier for the gaseous nitrogen makes upgrades to their pipeline configuration to support Artemis I testing and launch.

While most objectives associated with the wet dress rehearsal were met during recent testing, teams plan to return to the launch pad when repairs and checkouts in the VAB are complete for the next full wet dress test attempt. Following completion of the test, SLS and Orion will return to the VAB for the remaining checkouts before rolling back out to the pad for launch.

Watch a live stream of the rocket on the Kennedy Newsroom YouTube channel and check back here for updates.

Artemis I WDR Update: Third Test Attempt Concluded

Teams concluded today’s wet dress rehearsal test at approximately 5:10 p.m. EDT after observing a liquid hydrogen (LH2) leak on the tail service mast umbilical, which is located at the base of the mobile launcher and connects to the rocket’s core stage. The leak was discovered during liquid hydrogen loading operations and prevented the team from completing the test.

Before ending the test, teams also met test objectives for the interim cryogenic propulsion stage by chilling down the lines used to load propellant into the upper stage. They did not flow any propellant to the stage because of an issue with a helium check valve identified several days ago.

When teams paused propellant loading, the rocket’s core stage liquid oxygen tank was about 49% filled and the liquid hydrogen tank had been loaded to about 5% capacity prior to the hydrogen leak.

Teams are now working to drain propellant from the rocket. They will inspect the umbilical connection, review data, and establish a go-forward plan to address the hydrogen leak.

NASA plans to host a media teleconference April 15 to provide updates on troubleshooting and next steps for the wet dress rehearsal test.

Artemis I WDR Update: Teams Complete Modified Upper Stage Liquid Hydrogen Operations

While loading liquid hydrogen (LH2) on the rocket’s core stage earlier this afternoon, engineers detected a leak on the tail service mast , which is located at the base of the mobile launcher and connects to the core stage.

Though engineers stopped loading LH2 and liquid oxygen (LOX) on the core stage, the launch director gave approval for teams to chill down the ICPS LH2 lines to collect additional data and have completed that activity. Engineers will not load LH2 or LOX into the ICPS tanks, due to an issue with a helium check valve experienced several days ago. When teams paused propellant loading earlier today, there was about 49% of LOX on the core stage and about 5% of LH2 was loaded into the core stage tank prior to the hydrogen leak.

The terminal countdown will also not occur today due to the modified configurations and delays with propellant loading. Teams are reassessing the next steps and will determine a go-forward plan following today’s test.

Artemis I WDR Update: Teams Working Solution to Continue Propellant Loading Operations

Following the completion of slow fill for liquid hydrogen (LH2), teams encountered an issue when they started fast fill operations for LH2. After fast fill on LH2 began, a surge in pressure automatically stopped the flow of liquid hydrogen. Teams are working to troubleshoot this issue and the rocket is in a safe configuration. In the meantime, liquid oxygen flow was paused on the core stage to ensure the tanking operations for LOX and LH2 remain synchronized.

After fast fill resumes for liquid hydrogen to the core stage, teams will load minimal cryogenic propellants on the interim cryogenic propulsion stage. Because of an issue with a helium check valve found several days ago, teams will chill down the lines used to load propellant into the upper stage but not flow any actual propellant to the stage.

The clock is continuing to count down for now, and the team will work to re-synchronize the operations timeline and clock during a planned T-10-minute hold at which point the launch team will establish a new T-0.

Follow along with the countdown on the Exploration Ground Systems Twitter and watch a live stream of the test on the Kennedy Newsroom YouTube channel.

Artemis I WDR Update: Core Stage Liquid Oxygen Loading Operations Resume

After troubleshooting an issue with the temperature of liquid oxygen during early stages of propellant loading into the rocket’s core stage, launch controllers have resumed operations. Teams performed chill down operations again before liquid oxygen began flowing into the tank and adjusted pump speeds as necessary during flow to help ensure temperatures remain below limits. They also opened valves to bleed off any warm liquid oxygen.

Earlier in the count, teams began slow fill operations for liquid oxygen, but were automatically halted when temperature readings on the propellant showed it was warmer than intended. The liquid oxygen is an extremely cold, or cryogenic, propellant that is maintained at minus 297 degrees Fahrenheit and must be kept at super cold temperatures. As the super cold liquid oxygen fills the core stage main propulsion system, some venting may be visible.

Teams have now progressed to fast fill for core stage liquid oxygen and slow fill for liquid hydrogen.

Follow along with the countdown on the Exploration Ground Systems Twitter and watch a live stream of the test on the Kennedy Newsroom YouTube channel.

Artemis I WDR Update: Final Umbilical Preparations Complete for Artemis I

Final preparations on the umbilicals to ensure connectivity between the mobile launcher, the Space Launch System rocket and Orion spacecraft were completed this evening.

The umbilicals provide power, communications, coolant, and fuel to different parts of the rocket. Additional accessories provide access and stabilize the rocket and spacecraft. During launch, each umbilical releases from its connection point, allowing the rocket and spacecraft to lift off safely from the launch pad.

Teams have also completed a final walkdown at the pad to verify the rocket and ground equipment are in the correct configuration for tanking operations checking to ensure no foreign object debris is present near the rocket that could present a hazard during the test.

The next update will be provided in the morning of April 14, prior to the mission management team’s pre-tanking briefing where they will review the status of operations and determine if they are “go” to proceed toward tanking operations.

Real-time updates will be provided on the Exploration Ground Systems Twitter account with “go” for tanking targeted on April 14. NASA is also streaming live video of the rocket and spacecraft on the Kennedy Newsroom YouTube channel.