SpaceX Falcon 9 Fueling Underway for Sentinel-6 Michael Freilich Launch

Fueling of the SpaceX Falcon 9 first and second stages is underway. NASA and SpaceX mission and launch managers will begin the final poll for launch. Here are some countdown events.

Countdown Events

L-44:00           NLM poll
L-38:00           Final propellant load poll
L-35:00           RP-1/LOX Load
L-10:00           Confirm spacecraft to internal power
L-7:00             Engine chill begins
L-6:00             Falcon 9 to internal power
L-5:00             RP-1 full
L-5:00             Spacecraft verified to internal power (NLM)
L-4:30             Strongback moved away from rocket
L-4:00             LD polls NLM for NASA go/no-go for launch (NLM)
L-3:00             Fueling (O2) complete (Stage 1 LOX close out)
L-3:00             Thrust vector control check
L-2:00             Range is GO
L-2:00             Stage 2 LOX close out
L-1:00             Falcon (vehicle) in start-up
L-1:00             Command flight computer final prelaunch checks
L-1:00             Propellant tanks pressurize for flight
L-0:45             GO for launch from LD
L-0:18             Sound suppression to flood pad
L-0:03             Engine controller commands engine ignition sequence to start