Falcon Heavy – Countdown Timeline

All Times Approximate & in reference to Falcon 9.

Time Event
L-1 Day to L-10 Hours Falcon Heavy to Vertical
L-10:00:00 Countdown Initiation, Launch Vehicle Power-Up
L-6:00:00 First Weather Balloon Release
L-4:45:00 Range Controllers on Station
L-4:35:00 Attitude Control System N2 Loading
L-2:30:00 Launch Area Evacuation
L-2:30:00 Launch Vehicle Release System Test
L-2:25:00 TEA-TEB Bleed In
L-2:00:00 RF Link & FTS Checks (Round 2)
L-1:55:00 Data Flow Tests with Downrange Tracking Stations
L-1:45:00 Blast Danger Area Clear, Roadblocks Established
L-1:45:00 Propellant Load Setup (Transfer Lines Chill, Tank Vent)
L-1:40:00 Eastern Range Holdfire Checks
L-1:35:00 Weather Briefing
L-1:28:00 Launch Readiness Poll
T-1:25:00 Automated Countdown Sequence
T-1:25:00 Rocket Propellant 1 Loading
T-0:55:00 Flight Control System Setup (Flight Software Loading)
T-0:47:00 Go/No Go for LOX Load
T-0:45:00 Boosters/Core Stage Liquid Oxygen Loading
T~0:41:00 Stage 1 LOX Fast Fill
T-0:28:00 Range Readiness Check (Air Force & Coast Guard)
T-0:25:00 Spacecraft to Internal Power (Variable Time)
T-0:20:00 Second Stage LOX Load (S1 Throttle Down)
T-0:18:00 Second Stage Helium Load
T~0:13:00 1st Stage LOX Load in Pre-Topping
T-0:13:00 Countdown Recycle Point
T-0:12:45 Merlin 1D & MVac BTV Activation
T-0:10:15 Grid Fin Actuators Secured
T-0:10:05 Boostback Hazards Disabled
T-0:09:50 Flight Software Final Setups complete
T-0:09:45 TEA-TEB Ignition System Setup
T-0:09:45 Stage 2 Transmitter Re-Activation
T-0:09:00 M1D Trim Valve Setup Complete
T-0:08:00 M1D & MVac Hydraulic Pressurization
T-0:08:00 MVac Fuel Trim Valve Setup
T-0:07:35 M1D Engines to TVC-Null Position
T-0:07:30 Engine Chill Readiness
T-0:07:05 Stage 1 Helium Cushion Secured
T-0:07:00 Spacecraft on Internal Power
T-0:06:45 Engine Chilldown (Bleed Valves Open, both Stages)
T-0:06:30 M1D/MVac Hydraulics at Bleed Pressure
T-0:06:15 MVac Fuel Trim Valve Motions
T-0:06:00 Fuel Top-Up Flight Level
T-0:05:30 MVac FTV Motions complete
T-0:05:30 Flight Computers in Self-Alignment
T-0:05:20 Stage 1 Fuel Loading Complete
T-0:05:10 Launch Vehicle Heater Deactivation
T-0:05:00 Preliminary Tank Pressurization for Strongback Release
T-0:05:00 Transfer to Internal Power
T-0:05:00 Range Voice Checks
T-0:04:45 Stage 2 Thrust Vector Control Test
T-0:04:40 Stage 1 Helium Secured
T-0:04:30 Stage 2 RP-1 Bleed
T-0:04:00 Strongback Priming for Rapid Retract
T-0:04:00 Vehicle Release Auto Sequence
T-0:03:45 Stage 2 TVC Motions Complete
T-0:03:40 Ground Hydraulics Securing
T-0:03:25 Flight Termination System to Internal Power
T-0:03:00 FTS on Internal
T-0:03:00 Stage 1 POGO Bleed Verification
T-0:02:55 Verify Good Mvac TVC
T-0:02:45 Fuel Trim Valve to Flight Position
T-0:02:40 Stage 1 LOX Secure at Flight Level
T-0:02:30 Mvac Fuel Bleed Complete
T-0:02:25 Igniter Purge Complete
T-0:02:20 Strongback Secure for Launch 88.5°
T-0:02:25 Mvac Bleed Valve Motions
T-0:02:00 Stage 2 LOX Secure at Flight Level (Latest)
T-0:02:00 Transfer to Internal Power Complete
T-0:01:45 M1D Fuel Bleed Complete
T-0:01:35 Prop GSE Securing
T-0:01:30 Self-Align Verification
T-0:01:30 Final Engine Chilldown
T-0:01:25 Final Gas Close Outs (Helium termination)
T-0:01:15 Engine Chilldown Complete
T-0:01:10 Final FTS/AFSS Status Check
T-0:01:00 Flight Computer to start-up
T-0:00:45 Launch Director: Go for Launch
T-0:00:40 Stage 1, Stage 2 Pressurization for Flight
T-0:00:30 HOLD Call for Abort
T-0:00:15 Vehicle Configured for Flight
T-0:00:10 Latest VC Abort
T-0:00:07 Pad Deck Water Deluge System Activation
T-0:00:05 Side Booster Ignition Sequence Start
T-0:00:03 Core Stage Ignition Sequence Start
T-0:00:00 Strongback Kickback at Liftoff
T-0:00:00 LIFTOFF


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