Falcon Heavy | NROL-97

Timeline

Times are relative to liftoff (T 0:00) and follow the current launch time.

1. T−53:0053 minutes before liftoff: GO for Prop Load Launch director verifies go for propellant load
2. T−50:0050 minutes before liftoff: Stage 1 Propellant Load Start of propellant loading in the first stage
3. T−45:0045 minutes before liftoff: Stage 1 LOX Load Start of liquid oxygen loading in the first stage
4. T−35:0035 minutes before liftoff: Stage 2 Propellant Load Start of propellant loading in the second stage
5. T−18:3018 minutes 30 seconds before liftoff: Stage 2 LOX Load Start of liquid oxygen loading in the second stage
6. T−7:007 minutes before liftoff: Engine Chill Start of engine chilling
7. T−0:5959 seconds before liftoff: Startup The onboard computer takes control over the countdown and runs last checks
8. T−0:4545 seconds before liftoff: GO for Launch Launch director verifies go for launch
9. T−0:2020 seconds before liftoff: Tank Press Fuel tanks are pressurized to flight levels
10. T−0:066 seconds before liftoff: Ignition Start of the engine ignition sequence
11. T 0:00at liftoff: Liftoff First upwards movement of the rocket
12. T+1:091 minute 9 seconds after liftoff: Max-Q Maximum dynamic pressure
13. T+2:242 minutes 24 seconds after liftoff: SBECO Cut-off of the side boosters
14. T+2:272 minutes 27 seconds after liftoff: Boosters Separation Separation of the side boosters
15. T+2:312 minutes 31 seconds after liftoff: Boosters Flip Flip maneuver of the side boosters
16. T+2:422 minutes 42 seconds after liftoff: Boosters Boostback Burn Startup Start of the boosters boostback burn
17. T+3:473 minutes 47 seconds after liftoff: Boosters Boostback Burn Shutdown End of the boosters boostback burn
18. T+3:513 minutes 51 seconds after liftoff: MECO Cut-off of the main engine
19. T+3:543 minutes 54 seconds after liftoff: Stage 2 Separation Separation of the second stage from the first
20. T+4:004 minutes after liftoff: SES-1 First start of the second engine
21. T+4:174 minutes 17 seconds after liftoff: Fairing Separation Separation of the payload fairing
22. T+6:296 minutes 29 seconds after liftoff: Boosters Entry Burn Startup Start of the boosters atmospheric entry burn
23. T+6:376 minutes 37 seconds after liftoff: Boosters Entry Burn Shutdown End of the boosters atmospheric entry burn
24. T+7:307 minutes 30 seconds after liftoff: Boosters Landing Burn Start of the boosters landing burn
25. T+7:477 minutes 47 seconds after liftoff: Boosters Landing Landing of the boosters