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[b]Astronauts conducting second July spacewalk[/b] On Tuesday (July 16), two ISS Expedition 36 flight engineers began a spacewalk at 6:57 a.m. CDT (1157 GMT), the second of two such excursions this month to prepare the International Space Station for a new Russian module and to complete additional installations on the station's backbone truss. Chris Cassidy of NASA and Luca Parmitano of the European Space Agency and Italian Space Agency began the spacewalk when they switched their spacesuits to battery power. During the scheduled six-hour, 15 minute excursion, Cassidy and Parmitano will: [list][*]finish the installation of bypass jumpers to provide power redundancy to critical station components; [*]route additional cables for a new Russian Multipurpose Laboratory Module targeted to arrive later this year; [*]replace a video camera on the Japanese Exposed Facility experiment platform; [*]relocate wireless television camera equipment; [*]troubleshoot a balky door cover over electronic relay boxes on the station's truss; and [*]reconfigure a thermal insulation over a failed electronics box that was removed from the station's truss last year.[/list] Cassidy, who is designated EV1 for the spacewalk, is wearing a U.S. extravehicular mobility suit bearing red stripes. This spacewalk is the sixth of Cassidy's career. Parmitano, designated EV2, is wearing a spacesuit with no stripes and is making the second spacewalk of his career. He is the first Italian astronaut to walk in space. Astronaut Shane Kimbrough at NASA's Mission Control Center in Houston provides ground support for the spacewalkers. Aboard the station, flight engineer Karen Nyberg is providing additional support during the extravehicular excursion.
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