The launch originally was scheduled for December 18, but the closeout of an aft orbiter compartment was delayed and the mission was rescheduled for the next day on December 19, the countdown was stopped at T-14 seconds because of an out-of-tolerance turbine reading on the right SRBs hydraulic system. Another launch attempt on January 6, 1986, was terminated at T-31 seconds because a problem in a valve in the liquid oxygen system. The countdown was recycled to T-20 minutes for a second launch attempt on the same day but was held at T-9 minutes and then scrubbed as the launch window expired. Other launch attempts were made on January 7, scrubbed because of bad weather at contingency landing sites at Dakar, Senegal, and Morón, Spain; on January 9, delayed because of a problem with a main engine prevalve; and on January 10 because of heavy rain in the launch area. The launch finally took place at 6:55 am EST, on January 12 without further problems. Columbia was destroyed during re-entry on February 1, 2003 near the end of its 28th, STS-107 mission.
http://www.youtube.com/watch?v=cZ2HJnfCAKs&hl=en
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