Falcon 9/Dragon – Countdown Timeline

This timeline is for the retired Falcon 9 v1.1 launch vehicle, see the Falcon 9 FT Countdown for the modified vehicle’s countdown procedure.

Time Event
L-15:00:00 Dragon Power Up (can occur earlier for late Cargo Load)
L-13:30:00 Countdown Initiation, Launch Vehicle Power-Up
L-13:30:00 F9 Checks – Comm, Avionics, Propulsion, FTS
L-5:00:00 Launch Area Evacuation
L-3:50:00 Liquid Oxygen Loading
L-3:40:00 Rocket Propellant 1 Loading
L-3:00:00 Taking complete
L-3:00:00 LOX Replenish
L-1:40:00 Comm & FTS Checks
L-1:00:00 Weather Briefing
L-0:13:00 Launch Director Poll
L-0:11:00 Terminal Count Briefing
T-0:10:00 Terminal Countdown
T-0:09:55 Verify that Terminal Countdown has started
T-0:09:50 Range Recorders Start
T-0:09:45 Launch Enable to Flight Mode
T-0:09:30 First Stage Merlin Engine Chilldown, Pre Valves to Open
T-0:09:17 Merlin 1D: Lox Bleeder Valves Open
T-0:08:15 Engine Trim Valve Cycling
T-0:07:30 Go/No Go for Launch
T-0:07:00 Dragon to Internal Power
T-0:06:45 Heater Shutdown
T-0:06:10 Falcon 9 to Internal Power
T-0:05:55 Pressurization for Strongback Retract
T-0:05:30 Strongback Cradles Opening
T-0:05:30 Dragon configured for Solar Array Power Generation
T-0:05:30 Dragon Countdown Auto Sequence
T-0:05:00 Second Stage Nitrogen Loading Termination
T-0:04:46 Stage 1 & Stage 2 Auto Sequence starts
T-0:04:30 Stage 2 Thrust Vector Control Bleed
T-0:04:25 Strongback Retraction
T-0:04:10 Vehicle Release Auto Sequence
T-0:03:40 TEA-TEB Ignition System Activation
T-0:03:30 Strongback Retraction complete
T-0:03:25 Flight Termination System to Internal Power
T-0:03:10 Flight Termination System Armed
T-0:03:02 LOX Topping Termination
T-0:02:45 Strongback Securing complete
T-0:02:45 Fuel Trim Valve to Flight Position
T-0:02:20 Propellant Tank Pre-Press
T-0:02:00 Align Flight Computers to Self Alignment
T-0:02:00 Range Verification
T-0:02:00 Flight Control to Self Alignment
T-0:01:35 Helium Loading Termination
T-0:01:30 Final Engine Chilldown, Pre-Valves/Bleeders Open
T-0:01:20 Engine Purge
T-0:01:00 Flight Computer to start-up
T-0:01:00 Pad Deck Water Deluge System Activation
T-0:00:50 First Stage Thrust Vector Actuator Test
T-0:00:40 Propellant Tank Pressurization
T-0:00:25 All Tanks at Flight Pressure
T-0:00:15 Arm Pyrotechnics
T-0:00:10 Latest VC Abort
T-0:00:03 Merlin Engine Ignition
T-0:00:00 LIFTOFF