Flight Engineers Fyodor Yurchikhin and Mikhail Kornienko exited the Pirs docking compartment at 11:11 p.m. CDT Monday, beginning the first spacewalk during Expedition 24.
The cosmonauts, both wearing Russian Orlan spacesuits with blue stripes, are scheduled to outfit the Rassvet mini-research module for the Kurs automated rendezvous system and replace a video camera on the Zvezda service module.
This is the 25th Russian and the 147th spacewalk overall in support of station assembly and maintenance.
Kornienko is making his first spacewalk and Yurchikhin is performing his fourth. Yurchikhin's first three spacewalks occurred while he was commander of Expedition 15 in 2007.
The spacewalkers are working outside the Zvezda service module 10 years to the day after its addition to the International Space Station.