The preparations for the second of five spacewalks planned during shuttle Endeavour's stay at the International Space Station are running ahead of schedule, so two astronauts likely will head outside the outpost about a half-hour early.
Mission specialists Dave Wolf and Tom Marshburn are suited up in the station's U.S. Quest airlock and are getting ready to depressurize it in advance of a spacewalk that had been slated to start about 11:28 a.m.
The two are on track to open the hatches about the top of the hour.
Wolf and Marshburn aim to transfer large spares from an integrated cargo carrier to an external stowage platform on the port side of the station's central truss.
The astronauts also will set up vision equipment that will help station crews position payloads on an external experiment platform outside the Japanese Kibo science laboratory module.
The spacewalk is expected to take about 6.5 hours to complete.
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