Share webCountdown with your friends Create a. Countdown timer for events There are a lot of options to customize your countdown. 1 hour 45 minutes 30 minutes 15 minutes 10 minutes 5 minutes 1 minute.
1 Hour Countdown Clock Free Cursors Or
On this page, you'll learn how the countdown operates, and what milestones to watch for during our live launch coverage.In the Clock app , you can use the timer to count down from a specified time. Great tool for learning Chinese.The countdown clock is one of the most-watched timepieces in the world. Colorful Tic-Tac-Toe in Chrome from tCubed Improve your English communication with Gingers 1 spelling and grammar checker Create and save drawings at the click of a button. Use a large collection of free cursors or upload your own. Fun custom cursors for Chrome. Credit: NASACountdown Timer.
Begin final vehicle and facility close-outs for launch Note: Event times and lengths are approximate and subject to change.The Shuttle Test Director performs the traditional call to stations and the countdown clock is activated. To create your own countdown, for your own date, with your own look and feel, follow the link at the bottom of this page.Here are some of the key events that take place at each milestone after the countdown begins.
1 Hour Countdown Clock Software Into The
Clear launch pad of all non-essential personnel Complete flight deck preliminary inspectionsThis is the first built-in hold and typically lasts four hours. Complete preparation to load power reactant storage and distribution system Remove middeck and flight deck platforms Load backup flight system software into the orbiter's general purpose computers
Begin final preparations of the orbiter's three main engines for main propellant tanking and flight Demate the orbiter's midbody umbilical unit Begin operations to load cryogenic reactants into the orbiter's fuel cell storage tanksThis built-in hold typically lasts four hours, but may be extended if PRSD offload is required.
Switch the orbiter's purge air to gaseous nitrogenImage above: Sparks fly beneath space shuttle Discovery as engines ignite for the liftoff on mission STS-124. Clear the blast danger area of all nonessential personnel Activate the orbiter's inertial measurement units and communications systems Move rotating service structure to "park" position Close out the tail service masts on the mobile launcher platformThis built-in hold varies between 13 to 14 hours. Resume orbiter and ground support equipment close-outs
Finish filling the external tank with its flight load of liquid hydrogen and liquid oxygen propellantsThis built-in hold typically lasts two-and-a-half hours. Begin loading the external tank with about 500,000 gallons of cryogenic propellants Chill-down of propellant transfer lines Launch team verifies no violations of launch commit criteria before loading the external tank with propellants Mission Management Team and launch director receive weather update
Crew departs for the launch pad and, upon arriving at the pad, begins entry into the orbiter via the White Room Astronaut Support Person enters crew module and begins comm checks 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 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 Align Merritt Island Launch Area (MILA) tracking antennas Perform inertial measurement unit preflight calibration
Complete inertial measurement unit preflight alignments NASA Test Director conducts final launch team briefings Credit: NASAThis built-in hold typically lasts 10 minutes. Close-out crew retreats to fallback areaA fish-eye view captures space shuttle Endeavour just after liftoff on mission STS-111. Close the orbiter's crew hatch and check for leaks Astronauts perform air-to-ground voice checks with Launch Control (Kennedy Space Center) and Mission Control (Johnson Space Center)
Transition backup flight system to launch configurationThis is the final built-in hold, and varies in length depending on the mission.
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