T-4 hours, 30 minutes
• Technicians remove the external environmental control systems that provide cool airflow to the vehicle
• Onboard navigation unit begins system alignment
• Additional subsystems complete testing and remain powered on
• First stage avionics module (FSAM) access platform is retracted
T-3 hours, 30 minutes
• Six additional weather balloons begin to launch to evaluate if the conditions are suitable for flight
T-3 hours
• Fault tolerant inertial navigation unit (FTINU) completes alignment and begins navigation testing
T-2 hours, 30 minutes
• C-band beacon transponder is powered up and tested with the range
• Range safety system verification walk down is completed
• Auxiliary power unit is verified for system health
T-2 hours
• VSS is retracted and secured
• Ground control station (GCS) system begins monitoring for commands from the Launch Control Center
• Sound suppression water control is transferred to the GCS
• Video, operational flight instrumentation (OFI) and developmental flight instrumentation (DFI) are checked
T-1 hour, 45 minutes
• Safety personnel begin the process of securing launch pad
T-1 hour, 15 minutes
• Ground command, control and communication initiates launch commit criteria monitoring
• Developmental flight instrumentation covers are removed
• FTINU executes final alignment after the VSS is retracted
T-1 hour
• All personnel depart Launch Pad 39B for the safe haven
• Range verifies all “go/no-go” interfaces
T-43 minutes
• Flight termination system is activated and set to safe
T-30 minutes
• DFI, with the exception of cameras, are powered on and recording
T-4 minutes, built-in hold
• Enter 10-minute built-in hold
• Vehicle can remain in this hold status for up to four hours
• Six video cameras and low power transmitters are powered up
• Telemetry is verified and readiness for launch established
• Range safety issues cleared for launch
• Countdown clock initiates automated count
T-3 minutes, 55 seconds and counting
• Sound suppression system is verified for pressure, water tank level and power
• Flight termination system and solid rocket motor ignition are set to arm
• Power to avionics cooling fans is terminated
• Onboard data recorder begins taking data
T-1 minute, 40 seconds
• Flight control system is enabled and prepared for flight
• Inertial measurement subsystem executes final alignment
T-1 minute, 20 seconds
• Flight control system receives the start count
• Signal is sent to the OFI and DFI data streams to synchronize
T-35 seconds
• Flight control system transfers from alignment to navigation mode
• Inertial and navigation data are verified for accuracy
• Auxiliary power unit start sequence is initiated
T-21 seconds
• Reusable solid rocket motor (RSRM) thrust vector control (TVC) gimbal test performed by rocking and tilting each axis approximately 1.5 degrees
T-16 seconds
• Ground control station issues commands for sound suppression, opening the valves to flood the mobile launch platform with water
•
At its peak, water will flow at a rate of 900,000 gallons per minute
T-0, liftoff
• RSRMs ignite and hold-down bolts fire.
T+0.225 seconds
• Liftoff
• Pyrotechnics fire, releasing umbilicals attached to the vehicle
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