Falcon 9 – 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-10:00:00 Falcon 9 to Vertical
L-8:30:00 Countdown Initiation, Launch Vehicle Power-Up
L-6:00:00 First Weather Balloon Release
L-5:00:00 Launch Area Evacuation
L-4:45:00 Range Controllers on Station
L-4:35:00 Falcon 9 Attitude Control System N2 Loading
L-4:50:00 Falcon 9 Reconfiguration for Propellant Loading
L-4:37:00 GO for Propellant Loading
L-4:20:00 Rocket Propellant 1 Loading
L-4:00:00 Eastern Range Countdown Initiation
L-4:00:00 LOX Systems Setup & Chilldown Ops
L-3:45:00 LOX Loading
L-2:45:00 Falcon 9 RF & Telemetry Checks
L-2:30:00 Falcon 9 Launch Vehicle Release System Test
L-2:25:00 TEA-TEB Bleed In
L-2:00:00 RP-1 Tanking complete
L-1:45:00 Comm & FTS Checks
L-1:40:00 Data Flow Tests with Downrange Tracking Stations
L-1:30:00 LOX Replenish
L-1:00:00 Weather Briefing
L-0:50:00 RF Link Checks
L-0:45:00 Flight Control System Setup (Flight Software Loading)
L-0:30:00 Final LOX Topping
L-0:27:00 Spacecraft to Internal Power
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-0:09:20 Ground TEA-TEB Setup
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 Spacecraft on Internal Power
T-0:07:00 First Stage Heater Shutdown
T-0:07:00 First Stage ACS Close-Out
T-0:06:35 Second Stage Heater Shutdown
T-0:06:25 Falcon 9 to Internal Power
T-0:06:00 Transfer to Internal complete
T-0:05:55 Pressurization for Strongback Retract
T-0:05:30 Strongback Cradles Opening
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 Test
T-0:04:25 Strongback Retraction
T-0:04:10 Vehicle Release Auto Sequence
T-0:03:45 Verify Good Mvac TVC
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-0:03:05 Flight Termination System Armed
T-0:03:00 LOX Topping Termination
T-0:03:00 Strongback Securing complete
T-0:02:45 Fuel Trim Valve to Flight Position
T-0:02:40 FTS Countdown Sequence
T-0:02:30 Launch Director: Go for Launch
T-0:02:20 Propellant Tank Pre-Press
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-0:00:55 Second Stage to Flight Pressure
T-0:00:50 First Stage Thrust Vector Actuator Test
T-0:00:40 First Stage to Flight Pressure
T-0:00:20 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