On Day 5, the second spacewalk of the mission was conducted, this time by first-time spacewalkers Burbank and MacLean.
They devoted the day to the final tasks required for activation of the Solar Alpha Rotary Joint (SARJ).
The SARJ is an automobile-sized joint that will allow the station's solar arrays to turn and point toward the sun.
Burbank and MacLean released locks that had held the joint secure during its launch to orbit aboard Atlantis.
As they worked, the spacewalkers overcame several minor problems, including a malfunctioning helmet camera, a broken socket tool, a stubborn bolt, and a bolt that came loose from the mechanism designed to hold it captive.
The stubborn bolt required the force of both spacewalkers to finally remove it.

Burbank and MacLean spent 7 hours and 11 minutes outside the station, beginning their spacewalk at 09:05 UTC and completing it at 16:16 UTC.
In addition to the SARJ work, they completed several "get-ahead" tasks during their time outside.

Engineers encountered a glitch during the four-hour activation and checkout of SARJ, and had temporarily delayed starting the deployment of the new solar arrays pending further work and checkout of the SARJ.
The timeline allowed ample time to continue working on the problem during the night and still complete the deploy of the arrays on Thursday as scheduled.
On Day 5, the second spacewalk of the mission was conducted, this time by first-time spacewalkers Burbank and MacLean. They devoted the day to the final tasks required for activation of the Solar Alpha Rotary Joint (SARJ). The SARJ is an automobile-sized joint that will allow the station's solar arrays to turn and point toward the sun. Burbank and MacLean released locks that had held the joint secure during its launch to orbit aboard Atlantis. As they worked, the spacewalkers overcame several minor problems, including a malfunctioning helmet camera, a broken socket tool, a stubborn bolt, and a bolt that came loose from the mechanism designed to hold it captive. The stubborn bolt required the force of both spacewalkers to finally remove it.
Burbank and MacLean spent 7 hours and 11 minutes outside the station, beginning their spacewalk at 09:05 UTC and completing it at 16:16 UTC. In addition to the SARJ work, they completed several "get-ahead" tasks during their time outside.
Engineers encountered a glitch during the four-hour activation and checkout of SARJ, and had temporarily delayed starting the deployment of the new solar arrays pending further work and checkout of the SARJ. The timeline allowed ample time to continue working on the problem during the night and still complete the deploy of the arrays on Thursday as scheduled.
STS-115