KSC-2011-4568

CAPE CANAVERAL, Fla. -- During a tanking test on June 15 at Launch Pad 39A at NASA's Kennedy Space Center in Florida, there was an apparent liquid hydrogen leak in the main fuel valve in Atlantis' space shuttle main engine No. 3. Technicians now are replacing the suspect valve and a leak check of the valve and associated systems will be conducted. The work is expected to take about a week, which still would support Atlantis' targeted July 8 launch date. STS-135 Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim are targeted to lift off on space shuttle Atlantis July 8, taking with them the MPLM packed with supplies, logistics and spare parts to the International Space Station. The STS-135 mission also will fly a system to investigate the potential for robotically refueling existing satellites and return a failed ammonia pump module to help NASA better understand the failure mechanism and improve pump designs for future systems. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of NASA's Space Shuttle Program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Jim Grossmann