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KENNEDY SPACE CENTER, FLA. - Workers in bay 3 of the Orbiter Processing Facility check the installation of the orbiter boom sensor system in Discovery's payload bay. The boom was removed last week in order to inspect the power system, which is routine after every flight. Discovery returned from mission STS-121 in late July, and is now being processed for mission STS-116, scheduled to launch in mid-December. Photo credit: NASA/Jim Grossmann