Flight Day 5 saw the completion of the first of three spacewalks. NASA reports:
One Spacewalk Down, Two to Go
Mission Specialists Piers Sellers and Mike Fossum successfully completed STS-121’s first spacewalk at 4:49 p.m. EDT today. The excursion outside Space Shuttle Discovery and the International Space Station featured two major scheduled tasks.
First, Sellers and Fossum installed a device to block the cutter blade on the station’s mobile transporter. The device will prevent the blade from cutting a power and data cable that links the mobile transporter to the rest of the station. After the installation was complete, they reattached the cable. Their work will allow the mobile transporter to move the robotic arm along the station’s integrated truss structure, once a reel assembly that plays out the cable is replaced during the mission’s second spacewalk Monday.
Then, the orbital duo tested the ability of the shuttle’s robotic arm and boom extension to be used as a platform for astronauts who would conduct heat shield repairs. Sellers worked on the end of the 50-foot extension before being joined by Fossum to simulate various working conditions.
The spacewalkers were assisted from inside the shuttle/station complex by Pilot Mark Kelly, who was the spacewalk coordinator. Mission Specialists Lisa Nowak and Stephanie Wilson operated the shuttle’s robotic arm. The spacewalk began at 9:17 a.m. EDT.
Monday’s spacewalk is slated to begin at 8:13 a.m. EDT, and the third spacewalk will be performed on Wednesday.
+ NASA TV | + STS-121 Shuttle Mission TV Schedule
Yahoo News has stills from NASA TV. BBC News has a video clip of the EVA. Check the links at right for play-by-play and NASA TV.