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[b]Spacewalk begins to complete MBSU installation[/b] Expedition 32 flight engineers Suni Williams and Aki Hoshide began their second spacewalk in less than a week at 6:06 a.m. CDT (1106 GMT) on Wednesday (Sept. 5). They are working to complete the installation of a Main Bus Switching Unit (MBSU) that was hampered last week by a possible misalignment and damaged bolt threads. Williams and Hoshide built some improvised tools to assist with their installation tasks. The tools will be used to clean the MBSU bolts and receptacles and repair the bolt threads. If the astronauts are unable to install the MBSU, an option exists to return it to the airlock for further analysis and troubleshooting. Flight engineer Joe Acaba is the Canadarm2 robotic arm operator and will monitor the spacewalkers from inside the International Space Station. Hoshide will ride the Canadarm2 attached to a portable foot restraint to the MBSU worksite. The spacewalk is scheduled to last 6.5 hours and includes other tasks postponed from last week's excursion if the MBSU installation task is completed on time.
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