T-02:35:00....Poll stations to proceed with countdown master autosequence, fuel and oxidizer loading
T-01:40:00....Lower strongback umbilical tower
T-01:00:00....Allow countdown autosequence to proceed with Stage 2 fuel bleed and thrust vector control bleed
T-00:13:00....Poll by SpaceX launch director
T-00:11:00....Logical hold point
T-00:10:00....Begin terminal countdown sequence
T-00:09:43....Open prevalves to chill down first stage Merlin engine pumps
T-00:06:17....Issue command to align flight computer
T-00:05:00....Terminate loading of gaseous nitrogen into second stage
T-00:04:46....Transfer first and second stages to internal power
T-00:03:11....Arm flight termination system
T-00:03:02....Terminate liquid oxygen propellant topping
T-00:03:00....Verify movement of second stage thrust vector control steering actuators
T-00:02:30....SpaceX launch director verifies "go" for launch
T-00:02:00....Range verifies "go" for launch
T-00:01:35....Terminate loading of helium pressurant
T-00:01:00....Command flight computer to start-up state and turn on pad deck water deluge system
T-00:00:50....Check first stage thrust vector control steering actuators
T-00:00:40....Pressurize first and second stage propellant tanks
T-00:00:03....Command first stage engine ignition sequence
T-00:00:00....Liftoff
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