Watch LIVE: Spacewalk Happening To Fix ISS - Spokane, North Idaho News & Weather KHQ.com

Watch LIVE: Spacewalk Happening To Fix ISS

CAPE CANAVERAL, Fla. – A pair of spacewalking astronauts tackled urgent space station repairs Wednesday for the second time in five days, anxious to avoid the kind of toxic ammonia leak that disrupted their previous effort to restore full cooling.

The International Space Station has been operating with only half its usual cooling capability ever since an ammonia pump failed 1 1/2 weeks ago. Science research is on hold and unnecessary equipment is off until the pump can be replaced. The cooling system is crucial for keeping electronics from overheating.

Mission Control wished astronauts Douglas Wheelock and Tracy Caldwell Dyson good luck as they got started on what's considered to be one of the most challenging repairs in the 12-year history of the orbiting complex.

"Do good work out there today," Mission Control radioed. "Help us take care of this pump."

Flight controllers lowered the pressure in the disabled cooling line — one of two identical loops — prior to Wednesday's spacewalk. That should help prevent ammonia from spewing out like it did during Saturday's spacewalk. The leakdeveloped around a jammed connector on an ammonia hose; the spacewalkers had to hammer the connector loose, then plug it back in to stop the stream of ammonia.

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