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=== Flight Day 1: Launch ===
After a launch scrub on 4 April 2002 due to a hydrogen leak, [[Space Shuttle Atlantis|Space Shuttle ''Atlantis'']] successfully launched on 8 April 2002, from [[Kennedy Space Center Launch Complex 39|Launch Complex 39B]]. The countdown on 8 April encountered an unscheduled hold at the T-5-minute mark due to data dropouts in a backup [[Launch Processing System]]. The Launch Processing System team reloaded the required data and the countdown resumed. Liftoff occurred with 11 seconds remaining in the launch window.<ref>{{cite web|url=http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/archives/sts-110.html|title=NASA Mission Archives STS-110|access-date=8 April 2012|publisher=[[National Aeronautics and Space Administration]]}}</ref>
STS-110 was the first shuttle mission to feature the upgrade Block II [[Space Shuttle Main Engine|main engines]], which featured an "improved fuel pump...a stronger integral shaft/disk, and more robust bearings". The intent of the upgrade was to increase the flight capacity of the engines, while increasing reliability and safety.<ref>{{cite web|url=http://nix.nasa.gov/info?id=MSFC-0200213|title=MSFC-0200213|publisher=[[Marshall Space Flight Center]]|access-date=28 November 2009|url-status=dead|archive-url=https://web.archive.org/web/20110615224142/http://nix.nasa.gov/info?id=MSFC-0200213|archive-date=15 June 2011}}</ref>
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