United Space Alliance employee Harrell Watts applies RTV to a main landing gear door of Space Shuttle orbiter Enterprise.

In the Orbiter Processing Facility, United Space Alliance employee Harrell Watts applies RTV, a room-temperature vulcanizing silicone adhesive, to a main landing gear door of Space Shuttle orbiter Enterprise (OV-101) on which Thermal Protection System tiles are being installed. 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. After the tile installation is complete, the sections will be transferred to the Southwest Research Institute for testing requested by the Columbia Accident Investigation Board.