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Astronauts complete repairs on third spacewalk.

Summary: Astronauts onboard the International Space Station have embarked upon a spacewalk to complete urgent repairs.

Astronauts onboard the International Space Station have embarked upon a spacewalk to complete urgent repairs on their high-altitude laboratory.

Douglas Wheelock and Tracy Caldwell Dyson ventured out on their third spacewalk in just over a week.

This time, they were trying to install a new ammonia coolant pump in an effort to restore full cooling to the International Space Station.

The orbiting lab has been operating on half its normal cooling capability ever since a crucial pump failed in July.

It took two spacewalks, but Wheelock and Caldwell Dyson finally removed the broken pump last week.

The bathtub-size pumps are needed to drive ammonia through cooling loops and keep equipment from overheating.

Independent Television News Limited 2010. All rights reserved.

Independent Television News Limited 2009. All rights reserved.

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Publication:Independent Television News Limited (ITN)
Date:Aug 18, 2010
Words:152
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