Third Spacewalk Underway To Repair ISS Cooling System

Astronauts will go on a third spacewalk in an attempt to repair a failed cooling system on the International Space Station.

Douglas Wheelock and Tracy Caldwell will suit up this morning and venture outside the station for the third time in less than a week to attempt to install a new ammonia coolant pump.

Right now the ISS is relying on one cooling system instead of two, putting a lot of undue stress on the one unit which the astronauts are relying on.

Since the other pump failed on July 31, the astronauts have had to reduce the operating power of the station and postpone all their experiments.

The hope was to complete the task in two spacewalks, but on the first space walk the team was unable to remove the broken pump properly.

This spacewalk will be just under 7 hours and will feature the removal of the new pump from its storage, ant the instalation of that pump.

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