Two U.S. astronauts are conducting final spacesuit checks in the Quest airlock at the International Space Station and will be venturing outside the outpost with the next half-hour or so.
Discovery mission specialist Scott Parazynski and station flight engineer Dan Tani were about an hour ahead of schedule, but ground controllers ran into trouble handing off attitude control of the joined shuttle-station complex from Discovery to outpost gyroscopes in advance of the excursion.
The depressurization of the American airlock is continuing.
Parazynski is answering to the radio call sign "EV-1" and is wearing a spacesuit with solid red stripes on its pant legs and backpack.
Tani is "EV-3" and is wearing a spacesuit with broken stripes.
Italian astronaut Paolo Nespoli of the European Space Agency will be directing the spacewalk from inside the joined shuttle-station complex.
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