NASA has progressed into the hydrogen topping phase for the Space Launch System (SLS) upper stage as part of the Artemis II rehearsal. This crucial step follows the completion of a successful vent and relief test of the interim cryogenic propulsion stage (ICPS) liquid hydrogen tank.
SLS Upper Stage Hydrogen Topping Phase
The vent and relief test was essential. It ensured that the vent and relief valves function properly. This guarantees the safety of pressure levels within the upper stage liquid hydrogen tank.
Topping is vital for maximizing the tank’s capacity. Once topping is complete, teams will shift into replenishment mode. This phase maintains the ICPS tank at optimal levels leading up to the terminal countdown.
Current Status of Propellant Tanks
- All propellant tanks on the SLS are currently in replenish mode.
- NASA is committed to ensuring the ICPS tank is flight-ready.
Live Updates
A live stream of the SLS rocket on the launch pad is available 24/7. This stream includes a separate feed for ongoing wet dress activities.
The ongoing preparations underscore NASA’s dedication and precision as it gears up for missions like Artemis II, with the next key date set for February 2, 2026.
