Saturday, May 11, 2013

Spacewalking astronauts detect no ISS leak

Crew members replace coolant pump as a precaution.

Chris Hadfield provided this photo of Chris Cassidy, top, and Tom Marshburn, in the final stages of preparing the suits and airlock for their spacewalk.Chris Hadfield provided this photo of Chris Cassidy, top, and Tom Marshburn, in the final stages of preparing the suits and airlock for their spacewalk.Chris Hadfield provided this photo of Chris Cassidy, top, and Tom Marshburn, in the final stages of preparing the suits and airlock for their spacewalk.

Two astronauts carried out a hastily arranged spacewalk today to replace what may have been the source of an ammonia leak in the cooling system of the International Space Station.
 
Americans Chris Cassidy and Tom Marshburn ventured out into space and travelled 45 metres to the worksite shortly after the hatch of the ISS opened at 8:45 a.m. ET.

ISS commander Canadian Chris Hadfield was assigned to oversee the mission. It was due to end at 3 p.m. ET, but three hours into the job, NASA said it was "running over an hour ahead of the timeline."

Hadfield greeted followers of his Twitter feed early Saturday morning with news of preparations for the spacewalk, saying it will be a "complex and vital" day for the crew.

Early in the mission, NASA reported the men spotted nothing unusual at the pump and flow subassembly box on the station's P6 truss, which was suspected of leaking ammonia coolant. A few hours later, they replaced the pump package as a precaution.

"All the pipes look shiny clean, no crud," Cassidy reported as he filmed the mission with a helmet camera.

For the rest of the story: http://www.cbc.ca/news/world/story/2013/05/11/spacewalk-hadfield-iss-leak.html

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