Astronaut Mike Fincke, left, Expedition 9 science officer and flight engineer, and cosmonaut Gennady Padalka, commander, pose with their Russian Orlan spacesuits on the International Space Station. They have been serving as test subjects in some onboard experiments, while preparing for an upcoming spacewalk using those suits. (NASA/JSC)

If the problem remains and another gyro fails, jet thrusters would have to be employed to position the station, using precious fuel.

The repair effort stalled last Thursday when astronaut Fincke lost pressure in the oxygen tank of his Russian space suit because of a faulty switch.

The two crewmen are again wearing Russian spacesuits for this outing because the U.S. suits have cooling problems.

The Russian outfits make the spacewalk slower and riskier than normal. Wearing them required the men to depart from the Russian hatch to a worksite that is near the U.S. module, forcing them to travel a greater than usual distance across the outpost before beginning the job.

They are also out of site of the Russian module's antennas, which could mean communications blackouts. So the crewmen have worked out hand signals if necessary to communicate.

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