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KENNEDY SPACE CENTER, FLA. -- In Orbiter Processing Facility Bay 3, the new orbital boom sensor system is lowered into Discovery’s payload bay. The previous boom was removed for repairs on the manipulator positioning mechanism, the pedestals that hold the boom in place in the payload bay. Discovery is the designated orbiter for the second return-to-flight mission, STS-121. The mission is scheduled no earlier than mid-May.

KENNEDY SPACE CENTER, FLA. -- In Orbiter Processing Facility Bay 3, the new orbital boom sensor system is lowered into Discovery’s payload bay. The previous boom was removed for repairs on the manipulator positioning mechanism, the pedestals that hold the boom in place in the payload bay. Discovery is the designated orbiter for the second return-to-flight mission, STS-121. The mission is scheduled no earlier than mid-May.