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[b]Artemis I launch countdown key events[/b] [b]L-13 hours and counting[/b] [list][*]The interim cryogenic propulsion stage (ICPS) is powered up (L-12 hours, 40 minutes) [*]All non-essential personnel leave Launch Complex 39B (L-12 hours)[/list] [b]L-8 hours, 40 minutes and counting[/b] [list][*]Built in countdown hold begins (L-8 hours, 40 minutes) [*]The launch team conducts a weather and tanking briefing (L-8 hours, 20 minutes) [*]Launch team decides if they are "go" or "no-go" to begin tanking the rocket (L-7 hours, 50 minutes)[/list] [b]L-7 hours and counting[/b] [list][*]Core stage liquid oxygen (LOX) chilldown (L-7 hours, 5 minutes) [*]Core stage LOX slow fill (L-6 hours, 25 minutes) [*]Core stage LOX fast fill (L-6 hours, 10 minutes) [*]Core stage liquid hydrogen (LH2) chilldown (L-6 hours, 5 minutes) [*]Core stage LH2 slow fill (L-6 hours) [*]Core stage LH2 fast fill (L-5 hours, 40 minutes)[/list] [b]L-4 hours, 30 minutes and counting[/b] [list][*]Core stage LH2 topping start (L-4 hours, 30 minutes) [*]ICPS LH2 chilldown (L-4 hours, 25 minutes) [*]Core stage LH2 replenish start (L-4 hours, 25 minutes) [*]Orion communications system activated (L-4 hours, 20 minutes) [*]ICPS LH2 fast fill (L-4 hours)[/list] [b]L-3 hours, 30 minutes and counting[/b] [list][*]Core stage LOX topping start (L-3 hours, 25 minutes) [*]Core stage LOX replenish start (L-3 hours, 20 minutes) [*]ICPS LOX chilldown begins (L-3 hours, 20 minutes) [*]ICPS LH2 validation and leak test (L-3 hours, 15 minutes) [*]ICPS LOX fast fill start (L-3 hours, 5 min) [*]ICPS LH2 tank topping start (L-3 hours) [*]ICPS/SLS telemetry data verified with Mission Control Center and SLS Engineering Support Center (L-3 hours) [*]ICPS LH2 replenish start (L-2 hours, 40 minutes) [*]ICPS LOX topping start (L-2 hours, 20 minutes) [*]ICPS LOX replenish start (L-2 hours, 10 minutes)[/list] [b]L-40 minutes and holding[/b] [list][*]Final NASA Test Director briefing is held [*]Built in countdown hold begins (30 min in duration) [*]The launch director polls the team to ensure they are "go" for launch[/list] [b]T-10 minutes and counting[/b] [list][*]Booster flight termination system moves to internal power (T-10 minutes) [*]Orion ascent pyros are armed (T-6 minutes) [*]Orion set to internal power (T-6 minutes) [*]Core stage LH2 terminate replenish (T-5 minutes, 57 seconds) [*]Core stage auxiliary power unit starts (T-4 minutes) [*]Core stage LOX terminate replenish (T-4 minutes) [*]ICPS LOX terminate replenish (T-3 minutes, 30 seconds) [*]Boosters transition to internal power (T-2 minutes) Artemis I Press Kit 13 [*]ICPS switches to internal battery power (T-1 minute, 56 seconds) [*]Core stage switches to internal power (T-1 minute, 30 seconds) [*]ICPS enters terminal countdown mode (T-1 minute, 20 seconds) [*]ICPS LH2 terminate replenish (T-50 seconds) [*]Ground launch sequencer sends "go for automated launch sequencer" command (T-33 seconds [*]Core stage flight computer to automated launching sequencer (T-30 seconds) [*]Hydrogen burn off igniters initiated (T-12 seconds) [*]Ground launch sequencer sends the command for core stage engine start (T-10 seconds) [*]RS-25 engines startup (T-6.36 seconds)[/list] [b]T-0[/b] [list][*]Booster ignition, umbilical separation, and liftoff[/list]
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