Spacewalkers hook up station's new solar power wings
20 Mar 2009 02:03:47 GMT Source: Reuters
* Spacewalking astronauts install new solar panel wings * First of three spacewalks during shuttle mission (Updates with end of spacewalk) By Irene Klotz HOUSTON, March 19 (Reuters) - Two visiting space shuttle astronauts floated outside the International Space Station on Thursday to hook up a final set of solar panel wings to bring the orbital outpost to full power. Spacewalkers Steven Swanson and Richard Arnold spent six hours outside the station during the first of three spacewalks planned for the flight. "Have a good run and do good work out there," Discovery pilot Tony Antonelli told his crewmates as they slipped outside the airlock around 1:20 p.m. EDT (1720 GMT). The goal of this spacewalk was to install the last metal girder onto the station's exterior spine. The 31,000-pound (14.06-tonne) segment, built by Boeing for NASA, contains a pair of delicate panels studded with solar cells to collect light from the sun. With the new wings, the station will be able to generate 124 kilowatts of usable electricity, enough to power about 42 average U.S. homes. NASA and its partners in the $100 billion project plan to use the extra power to support an expanded, six-person crew -- double the current size -- and more science experiments. The station, a project of 16 nations under construction for more than 10 years, is scheduled to be finished in 2010. From their vantage point outside the station, Swanson and Arnold helped robotic arm operators John Phillips and Koichi Wakata ease the truss, which is 45 feet (13.7 metres) long and 16 feet (4.9 metres) wide, into position on the right side of the station. "Basically, it's like backing your car in the garage," Swanson said in a preflight interview. "We'll be telling John, 'a little bit closer, a little bit to the left, little bit to the right,' and they will fly it into position where we can then drive the bolts." Swanson, a veteran of two previous spacewalks, and Arnold, a rookie astronaut, were working against the clock to get the truss off battery power and wired into the station's electrical system. The men had to make four electrical connections -- two power and two data -- to attach the new beam to one already anchored along the station's right side. It was tough going for a while, with the astronauts struggling with clamps and other equipment. Just before 4 p.m. (2000 GMT), the crew radioed to Mission Control that they were finished with the job. "It wasn't quite as smooth as we had hoped, but those guys did a great job and I'm very happy to say you have a go for (truss) activation," Discovery astronaut Joseph Acaba told ground control teams. The spacewalkers then turned their attention to opening boxes holding the station's solar panels so they can be unfurled on Friday. "You guys just did a fantastic job out there," Acaba told his crewmates as they wrapped up their six-hour spacewalk. Added station commander Michael Finck, "Welcome back aboard the space station. It's a lot bigger than when you left." (Editing by Jane Sutton and Todd Eastham)
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