NASA astronaut: Spacewalk will be ‘slow, methodical’

>>> in the meantime a critical mission this morning above all of us. a pair a nasa restaurants about to head outside of the international space station to make an emergency fix on a faulty pump. these missions, in our eyes, have become pretty routine in recent years but this is getting attention after an italian restaurant almost drowned while covering a spacewalk last year. tom, what can you tell us?

>> this is mission control behind me and these are the restaurants, rick and mike. this is to replace one of two cooling loops failed on the international space station and forcing the crew to lose power. if they lose the second coiling loop they have to ban the station. they have done this work before but this is the first space walk since an restaurant nearly drowned in his helmet last july.

>> reporter: at 230 miles above the earth this morning, an urgent space walk to repair a critical component on the space station . after one of two cooling pumps failed on the station last week.

>> there is an ammonia risk whenever replacing these cooling lubs.

>> reporter: the job replace the bad pump with a spare. doug weelock was the last restaurant to work on the pump in 2010 opinion this week, he recorded a video showing the space station crew how to go about the repair mission.

>> our advice to them and the crew agreed go slow and methodical step-by-step and challenge and response.

>> reporter: with their space suits hanging in the station, the two astronauts rick and mike, spent time preparing their equipment but the suits have been the focus of tremendous attention. on wednesday every component got a thorough inspection.

>> there is a bit of kind of a white residue.

>> reporter: the residue is a concern because that is thought tof blocked a water filtered last july and calling an restaurant helmet to fill with water.

>> water is in his eyes now. it seems to be increasing.

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NASA astronaut: Spacewalk will be ‘slow, methodical’