The water suppression system at the launch pad will start at Minus 30 seconds. At Minus 22 seconds, overall control will be given to the onboard computer. The Vulcain main engine will be readied for ignition with hydrogen chilldown starting at Minus 18 seconds. The residual hydrogen burn flares will fire beneath the Vulcain engine at Minus 7 seconds to burn away any free hydrogen gas. At Minus 3 seconds, onboard systems take over and the two inertial guidance systems go to flight mode.
All systems remain ready for flight.
The scheduled launch time has been loaded into the rocket's main computer system. Main stage tank pressures now at flight level. Pressurization now underway for the main cryogenic stage's liquid oxygen and hydrogen tanks. Also, final pyrotechnic arming has started. Minus-5 minutes and counting.