At the very beginning of September, the launch of the SLS rocket, the most powerful ever built, had to be canceled at the last minute because of a leak observed when filling its tanks with cryogenic fuel — oxygen and liquid hydrogen.
Hydrogen being highly flammable, these leaks must be avoided at all costs.
NASA has since carried out repairs, replacing a joint at the connection between the rocket and the large pipes supplying it with fuel. This seal had obviously been damaged by debris of unknown origin.
Wednesday’s test included refilling the fuel tanks.
A slight hydrogen leak was once again observed during the operations, but it was able to be checked by the NASA teams.
Last week, the agency said it was targeting Tuesday, September 27 for the next take-off attempt, in less than a week. A fallback date, October 2, has also been announced.
“Teams will evaluate test data, along with weather and other factors, before confirming that everything is ready for the next launch opportunity,” NASA said in a blog post.