KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center’s Orbiter Processing Facility, bay 3, workers at left are preparing to remove the orbiter boom sensor system from Discovery’s payload bay. The boom will undergo inspection. The orbiter will be processed for the second Return to Flight mission, STS-121. The orbiter boom sensor system, built in Canada, was used during Return to Flight mission STS-114 to provide more extensive inspection and photography of Discovery.

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