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Next on the NASA Space Shuttle Status Report: All three of NASA's orbiters are preparing for missions to the International Space Station. Discovery gets new wheels_ Atlantis is undergoing an underside inspection, and Endeavour is taking shape_ The NASA Space Shuttle Status Report starts right now. I'm Bob Walker, NASA test director, and this is the NASA Space Shuttle Status Report. Topping NASA's orbiter news this week: Inside Orbiter Processing Facility bay 3 at the Kennedy Space Center in Florida, orbiter Discovery is getting ready for its second return to flight test mission, named STS-121. Post-flight inspections of the thermal protective tiles that cover the underside of the orbiter are now in progress, as well as power-up testing on the vehicle systems. Technicians also installed new tires on Discovery's landing gear. Work on orbiter Atlantis is moving right along. Gap filler work and other processing continues inside Orbiter Processing Facility bay 1 at Kennedy. The vehicle is preparing to fly mission STS-115 to the International Space Station. Right now, workers are intensely checking, inspecting and installing gap fillers between the orbiter's thermal protective tiles. Gap