NASA - The National Aeronautics and Space Administration

11/21/2020 | News release | Distributed by Public on 11/21/2020 11:32

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