WASHINGTON, Aug. 4 (Xinhua) -- Two astronauts aboard the International Space Station will conduct the first of two spacewalks on Friday to replace a failed ammonia pump module at the station, NASA said Tuesday.
|NASA image shows the International Space Station in 2009. A failure of the |
cooling system on the International Space Station forced astronauts to
re-route power Sunday as NASA planned emergency spacewalks to
fix the problem. (Xinhua/AFP Photo)
The pump failed over the weekend and took down half of the space station's cooling system, which keeps electronic equipment from overheating.
The spacewalk was originally planned for Thursday. But after continuing to analyze and refine engineering requirements, and reviewing the results of an underwater practice session, NASA rescheduled it.
The second spacewalk is set for Monday. During the spacewalks, astronauts Doug Wheelock and Tracy Caldwell Dyson, both flight engineers, will replace the pump module, hook up electrical connections and fluid lines.