ISS Crews Preparing for Today’s Spacewalk
August 11, 2007
The International Space Station's robotic arm moves the S5 truss. Image: NASA TV
The STS-118 and Expedition 15 crews continue preparations for today’s spacewalk to install the Starboard 5 (S5) truss onto the International Space Station. STS-118 Mission Specialists Rick Mastracchio and Dave Williams are slated to begin their orbital stroll at 12:31 p.m. EDT.
The S5 will be attached to the Starboard 4 segment about 1:56 p.m. with the spacewalking duo guiding station robot arm operator Charles Hobaugh, STS-118’s pilot, as he moves the S5 to the attachment point. The spacewalkers will then bolt it into place and make power and data connections.
The other major task during the spacewalk is the retraction of a radiator on the Port 6 (P6) truss. After the radiator is folded, Mastracchio and Williams will secure it. The P6 will be relocated from atop the station to the end of the Port 5 truss during a future mission.
The excursion is scheduled to last 6.5 hours. Mission Specialist Tracy Caldwell is the spacewalk coordinator, and Expedition 15 Flight Engineer Clay Anderson is assisting Hobaugh at the controls of the station’s Canadian-built robotic arm.
Meanwhile, the Station-to-Shuttle Power Transfer System, which was activated after Friday’s docking, will be shut down during the spacewalk. The transfer system may allow Space Shuttle Endeavour and the STS-118 crew to stay at the station longer. A decision on a possible mission extension is expected to be made Sunday.
Source: NASA
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