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Countdown clock at NASA's Kennedy Space Center at L-11 hours (28 April 2011) of STS-134, Space Shuttle Endeavour. The launch weather guidelines involving the Space Shuttle and expendable rockets are similar in many areas, but a distinction is made for the individual characteristics of each.
STS-115 Atlantis long countdown to launch (launch status check at 3:03) (video private as of 4/7/24) Space Shuttle STS-114 Launch Final Poll ; Go For Launch Part 1 of 2 (2 examples launch director's poll) (video private as of 2/23/24) Go For Launch Part 2 of 2 (example final readiness poll) (video private as of 2/23/24)
The APU was eventually replaced, and the Hubble Space Telescope's batteries were recharged. On launch day, the countdown was briefly halted at T−31 seconds when Discovery ' s computers failed to shut down a fuel valve line on ground support equipment. Engineers manually commanded the valve to close and the countdown continued. [4]
After this point through to T-31 seconds, they are in charge of implementing a manual hold if necessary. After T-31 seconds only an automatic cutoff is available. The automatic cutoff recycles the countdown clock to T-20 minutes. Usually this will extend the launch time beyond the launch window causing a scrub and a 24-hour turnaround.
The North American Aerospace Defense Command defends North American airspace 24 hours a day, ... The website also features a countdown clock for when the Santa tracker is going live.
A large illuminated digital countdown clock and a flagpole flying an American flag on the edge of the turning basin have often been included in television coverage and launch photos. Before a launch, the clock counts down, showing the remaining time until T-zero in hours, minutes and seconds (–00:00:00).
Criteria for exiting the hold and restarting the countdown may be based on a fixed time, the completion of a checklist of work items, or a go/no-go decision from mission management. [ 1 ] For example, space shuttle launch countdowns begin at T−43 hours and include seven holds at T−27 hours, T−19 hours, T−11 hours, T−6 hours, T−3 ...
The longest orbital flight of the Shuttle was STS-80 at 17 days 15 hours, while the shortest flight was STS-51-L at one minute 13 seconds when the Space Shuttle Challenger broke apart during launch. The cold morning shrunk an O-Ring on the right Solid Rocket Booster causing the external fuel tank to explode.