Soyuz – Generic Countdown Timeline

Time Event
L-34:00:00 Tanking Preparations
L-08:00:00 Final Countdown commences
L-08:00:00 Launch Vehicle Activation
L-07:00:00 Soyuz Systems Checks
L-06:00:00 Battery Installation in Booster
L-05:00:00 State Commission Meeting
L-04:00:00 Propellant Loading
L-02:00:00 Liquid Oxygen loading complete
L-01:45:00 Tanking Cars depart
L-01:45:00 Launcher Systems Checks
L-01:00:00 Guidance System Activation
L-01:00:00 Launch Pad Evacuation
L-00:45:00 Flight Computer Software Load
L-00:45:00 Service Tower Retraction (Service Structure Halves)
L-00:30:00 Launch Command Power Activation
L-00:15:00 Launch Pad clear
L-00:15:00 Service Structure Power System Deactivation
L-00:10:00 Ten-Minute Launch Readiness
L-00:10:00 Inertial Guidance System Activation
L-00:10:00 On-Board Recorders activated
L-00:05:30 Launch Key Inserted in Launch Bunker
L-00:05:00 RUN 1 Command
L-00:05:00 Ground & On-Board Telemetry Activation
L-00:05:00 Transfer to onboard Control
L-00:03:15 Engine Nitrogen Purge
L-00:02:50 Propellant Drainback
L-00:02:40 Spacecraft Power Umbilical Disconnected
L-00:02:35 Propellant Tank Pressurization
L-00:02:30 RUN 2 Command
L-00:02:30 Onboard Measurement System Activation
L-00:02:15 Propellant Tank Drain&Safety Valves closed
L-00:02:15 LOX and N2 Loading Termination
L-00:01:00 Transfer to Internal Power
L-00:00:40 Third Stage Umbilical Mast Retraction
L-00:00:20 ENGINE IGNITION (Core Stage and Boosters)
L-00:00:20 Core Stage Umbilical Mast Retraction
L-00:00:15 Intermediate Thrust Level
L-00:00:10 Engine Turbopumps at Flight Speed
L-00:00:05 Full Thrust Level
L-00:00:00 Booster Umbilical Tower Retraction
L-00:00:00 LIFTOFF