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"The station arm will move to a new location where the shuttle arm will hand the new Kibo component back to it, and then the station arm will be used to move the new 'porch' into position for installation to the Kibo pressurized module," the space agency added.
Tim Kopra, who was making his first space walk, and Dave Wolf, an old hand with four walks under his belt, emerged from the ISS decompression chamber at 1619 GMT, 20 minutes later than scheduled.
They were set to prepare the installation of a third and final piece of the Japanese Kibo lab, brought up in the Endeavour's cargo bay.
The 1.9-tonne porch-like section, to be used for experiments in the vacuum of space, will be attached to Kibo's two pressurized modules that were delivered to the ISS last year.
Once the pieces are ready the astronauts inside will maneuver Endeavour's robotic arms to put the section in place.
Saturday's space walk was expected to take over six hours.
Earlier on their first full day in space, the Endeavour crew of six Americans and one Canadian tested rendezvous equipment, installed a camera for the orbiter docking system and extended the docking ring that sits on top of the system.
The Endeavour mission aims to help fulfill "Japan's hope for an out-of-this-world space laboratory," as the shuttle delivers state-of-the-art equipment to conduct experiments in the vacuum of space, according to NASA.
Wolf and Kopra spent the night in the Quest airlock to reduce the preparation time needed for the walk.
On Friday the shuttle successfully docked at the space station amid questions about the integrity of the shuttle's heat shield.
During the delicate docking maneuver the two space vehicles traveled at 28,000 kilometers (17,398 miles) per hour as they approached each other, giving Commander Mark Polansky a margin of error of 4.5 centimeters (1.8 inches) to complete the procedure, NASA said.
The entry of Endeavour's crew aboard the ISS brought the number of astronauts inside the orbiting space station to a record 13.
Kopra will be staying aboard the ISS, taking over from Japanese engineer Koichi Wakata, who has been in space for 124 days.
The ISS should be completed in 2010, also the target date for the retirement of the US fleet of three space shuttles.
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Tim Kopra, who was making his first space walk, and Dave Wolf, an old hand with four walks under his belt, emerged from the ISS decompression chamber at 1619 GMT, 20 minutes later than scheduled.
They were set to prepare the installation of a third and final piece of the Japanese Kibo lab, brought up in the Endeavour's cargo bay.
The 1.9-tonne porch-like section, to be used for experiments in the vacuum of space, will be attached to Kibo's two pressurized modules that were delivered to the ISS last year.
Once the pieces are ready the astronauts inside will maneuver Endeavour's robotic arms to put the section in place.
Saturday's space walk was expected to take over six hours.
Earlier on their first full day in space, the Endeavour crew of six Americans and one Canadian tested rendezvous equipment, installed a camera for the orbiter docking system and extended the docking ring that sits on top of the system.
The Endeavour mission aims to help fulfill "Japan's hope for an out-of-this-world space laboratory," as the shuttle delivers state-of-the-art equipment to conduct experiments in the vacuum of space, according to NASA.
Wolf and Kopra spent the night in the Quest airlock to reduce the preparation time needed for the walk.
On Friday the shuttle successfully docked at the space station amid questions about the integrity of the shuttle's heat shield.
During the delicate docking maneuver the two space vehicles traveled at 28,000 kilometers (17,398 miles) per hour as they approached each other, giving Commander Mark Polansky a margin of error of 4.5 centimeters (1.8 inches) to complete the procedure, NASA said.
The entry of Endeavour's crew aboard the ISS brought the number of astronauts inside the orbiting space station to a record 13.
Kopra will be staying aboard the ISS, taking over from Japanese engineer Koichi Wakata, who has been in space for 124 days.
The ISS should be completed in 2010, also the target date for the retirement of the US fleet of three space shuttles.
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