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Shuttle's External Tank Scanned; Leaky Valve Replaced

On June 20, technicians continued taking Computed Radiography (CR) X-ray scans of 50 support beams, called stringers, on space shuttle Atlantis' external fuel tank. The hi-tech imaging work at NASA Kennedy Space Center's Launch Pad 39A, Fla., is being done on the tops and bottoms of the 21-foot long beams, which are located on the shuttle-facing side of the tank's intertank section. The scans, which began June 19, are expected to take about a week to complete. The scans follow a June 15 tanking test. Technicians also are replacing the main fuel valve in Atlantis' space shuttle main engine No. 3, which apparently developed a small liquid hydrogen leak during the tanking test. The work is expected to take about a week, which still would support Atlantis' targeted July 8 launch date for its STS-135 mission to the International Space Station. The 12-day flight is the last mission of the Space Shuttle Program.
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