Spacewalkers Complete Gyro Replacement on Space Station

STS-114 Mission Specialists Soichi Noguchi and Steve Robinson continue their second spacewalk. They have completed their major task, the replacement of a Control Moment Gyro (CMG) in the International Space Station’s Z1 Truss. Flight Controllers will run tests to see if the new CMG is working correctly. It is one of four CMGs that provide attitude control to the Station. Now they will perform some get-ahead tasks for upcoming spacewalks.

The spacewalkers are assisted by Mission Specialist Andy Thomas, who is coordinating the spacewalk’s activities from inside. Pilot Jim Kelly and Mission Specialist Wendy Lawrence are at the controls of the Station’s robot arm. The spacewalk began at 4:42 a.m. EDT and is slated to last about 6.5 hours.

Meanwhile, the other Space Shuttle Discovery and Station crewmembers are transferring cargo.