Here are some of the key events that take place at each milestone after
the countdown begins.
Note: Event times and lengths are approximate and subject to change.
T-43 hours and counting The Shuttle Test Director performs the traditional call to stations and the countdown clock is activated. |
- Begin final vehicle and facility close-outs for launch
- Check out backup flight systems
- Review flight software stored in mass memory units and display systems
- Load backup flight system software into the orbiter's general purpose computers
- Remove middeck and flight deck platforms
- Activate and test navigational systems
- Complete preparation to load power reactant storage and distribution system
- Complete flight deck preliminary inspections
|
T-27 hours and holding This is the first built-in hold and typically lasts four hours. |
- Clear launch pad of all non-essential personnel
|
T-27 hours and counting |
- Begin operations to load cryogenic reactants into the orbiter's fuel cell storage tanks
|
T-19 hours and holding This built-in hold typically lasts four hours. |
- Demate the orbiter's midbody umbilical unit
|
T-19 hours and counting |
- Begin final preparations of the orbiter's three main engines for main propellant tanking and flight
- Fill launch pad sound suppression system water tank
- Resume orbiter and ground support equipment close-outs
- Close out the tail service masts on the mobile launcher platform
|
T-11 hours and holding This built-in hold varies in length, but typically lasts 12 to 13 hours. |
- Flight crew equipment late stow
- Move rotating service structure to "park" position
- Activate the orbiter's inertial measurement units and communications systems
- Perform ascent switch list
T-11 hours and counting | - Activate the orbiter's fuel cells
- Clear the blast danger area of all nonessential personnel
- Switch the orbiter's purge air to gaseous nitrogen
| T-6 hours and holding This built-in hold typically lasts two hours. | - Launch team verifies no violations of launch commit criteria before loading the external tank with propellants
- Clear pad of all personnel
- Chill-down of propellant transfer lines
- Begin loading the external tank with about 500,000 gallons of cryogenic propellants
| T-6 hours and counting | - Finish filling the external tank with its flight load of liquid hydrogen and liquid oxygen propellants
| T-3 hours and holding This built-in hold typically lasts two hours. | - Perform inertial measurement unit preflight calibration
- Align Merritt Island Launch Area (MILA) tracking antennas
- Final Inspection Team proceeds to the launch pad to conduct a detailed analysis of the vehicle as the team walks up and down the entire launch tower
- Closeout Crew proceeds to the launch pad to configure the crew module for countdown and launch and assist the astronauts with entry into the orbiter
| T-3 hours and counting | - Crew departs for the launch pad and, upon arriving at the pad, begins entry into the orbiter via the White Room
- Complete close-out preparations in the launch pad's White Room
- Check cockpit switch configurations
- Astronauts perform air-to-ground voice checks with Launch Control (Kennedy Space Center) and Mission Control (Johnson Space Center)
- Close the orbiter's crew hatch and check for leaks
- Complete White Room close-out
- Close-out crew retreats to fallback area
T-20 minutes and holding This built-in hold typically lasts 10 minutes. - Shuttle Test Director conducts final launch team briefings
- Complete inertial measurement unit preflight alignments
|
|
T-20 minutes and counting |
- Transition the orbiter's onboard computers to launch configuration
- Start fuel cell thermal conditioning
- Close orbiter cabin vent valves
- Transition backup flight system to launch configuration
|
T-9 minutes and holding This is the final built-in hold, and varies in length depending on the mission. |
- The Launch Director, Mission Management Team
- Shuttle Test Director poll their teams for a go/no go for launch
T-9 minutes and counting | - Start automatic ground launch sequencer
- Retract orbiter access arm (T-7 minutes, 30 seconds)
- Start auxiliary power units (T-5 minutes, 0 seconds)
- Arm solid rocket booster range safety safe and arm devices (T-5 minutes, 0 seconds)
- Start orbiter aerosurface profile test, followed by main engine gimbal profile test (T-3 minutes, 55 seconds)
- Retract gaseous oxygen vent arm, or "beanie cap"
(T-2 minutes, 55 seconds) - Crew members close and lock their visors
(T-2 minutes, 0 seconds) - Orbiter transfers from ground to internal power
(T-50 seconds) - Ground launch sequencer is go for auto sequence start (T-31 seconds)
- Activate launch pad sound suppression system
(T-16 seconds) - Activate main engine hydrogen burnoff system
(T-10 seconds) - Main engine start (T-6.6 second
| T-0 | - Solid rocket booster ignition and liftoff!
|
source : http://www.nasa.com
|
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