iUbo

*Start automatic ground launch sequencer
*Retract orbiter access arm (T-7 minutes, 30 seconds)
*Start auxiliary power units (T-5 minutes, 0 seconds)
*Arm solid rocket booster range safety safe and arm devices (T-5 minutes, 0 seconds)
*Start orbiter aerosurface profile test, followed by main engine gimbal profile test (T-3 minutes, 55 seconds)
*Retract gaseous oxygen vent arm, or "beanie cap" (T-2 minutes, 55 seconds)
*Crew members close and lock their visors (T-2 minutes, 0 seconds)
*Orbiter transfers from ground to internal power (T-50 seconds)
*Ground launch sequencer is go for auto sequence start (T-31 seconds)
*Activate launch pad sound suppression system (T-16 seconds)
*Activate main engine hydrogen burnoff system (T-10 seconds)
*Main engine start (T-6.6 seconds)

T-0
Solid rocket booster ignition and liftoff!

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