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Since it was announced that the Artemis 2 mission will begin, the countdown has begun to the T-10 minute.

These are the important milestones to come:

T-10M – Starts GLS terminal counting

T-8M – Crew Access Arm retraction

T-6M – GLS goes to core stage tank pressurization

T-6M – Orion climbing pyro armed

T-6M – Orion set to internal power

T-5M57S – Terminate core stage LH2 regeneration

T-5M20S – LAS feature available

T-5M20S – NTD lets commander know LAS capability is available

T-4M40S – GLS goes LH2 high flow leak control

T-4M30S – Flight termination system activated

T-4M – GLS is suitable for starting the core stage auxiliary power unit (APU)

T-4M – Core Stage APU launches

T-4M – End core stage LOX regeneration

T-3M30S – End ICPS LOX regeneration

T-3M10S – GLS prefers clearing sequence 4

T-2M02S – ICPS switches to internal battery power

T-2M – Booster switches to internal battery power

T-1M30S – Core stage switches to internal power

T-1M20S – ICPS terminal enters countdown mode

T-50S – End ICPS LH2 regeneration

T-33S – GLS sent command “go to autostart sequencer”

T-30S – Core stage flight computer with automatic launch sequencer

T-12S – Hydrogen combustion igniters launched

T-10S – GLS sends core stage motor start command

Starting T-6.36S– RS-25 engines

T-0 – Boost ignition, core separation and takeoff