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United Space Alliance technician Matt Boonstra works on a main landing gear door mounting fixture in the Launch Equipment Shop. The fixture is being used to support the Columbia mishap investigation. A simulated orbiter wing and several test panels, along with sections of Space Shuttle orbiter Enterprise (OV-101), will be transferred to the Southwest Research Institute for testing after Thermal Protection System (TPS) tile installation on them is complete. The testing has been requested by the Columbia Accident Investigation Board. For this initiative, sections of Enterprise were borrowed from the Smithsonian Institution's Air and Space Museum where the orbiter is being stored at the Washington Dulles International Airport. Enterprise was the first orbiter built in the Shuttle fleet and was used to conduct the Approach and Landing Test Program before the first powered Shuttle flight.