array. The unfurling of the solar panels themselves began a little behind schedule due to the problem encountered on Day 5 with SARJ. This problem was determined to be in the software, and a workaround was developed. The unfurling of the panels continued throughout the morning in stages to prevent the panels sticking, as they did during STS-97. It was noted by the crew that some panels were still sticking together, but this didn't cause any problems. Although the installation has been completed, the solar arrays will not provide power to the station until the next shuttle mission, STS-116, scheduled for December 2006, when the station will undergo a major electrical system rewiring. Other activities of Day 6 included a "double walk off" of the station's Canadarm2 from its current location at the Mobile Base System to the Destiny Laboratory Module and the preparation for the mission's third spacewalk. A number of interviews were also conducted later in the day, between Jett & MacLean and Canadian Prime Minister Stephen Harper & students. September 15 (Flight day 7) Flight day 7 featured the third and final spacewalk of mission STS-115. The start of the spacewalk was delayed after a circuit-breaker-like remote power controller (RPC) tripped, causing loss of power to the airlock's depressurization pump. This was attributed to a momentary spike in the electric current of the depressurization pump. After assessing data to ensure the system had no short circuit, the breaker was reset and pump reactivated. Joe Tanner and Heide Stefanyshyn-Piper began their spacewalk at 10:00 UTC after a 45-minute delay During the 6-hour and 42-minute spacewalk, the astronauts carried out numerous maintenance and repair tasks including removal of hardware used to secure the P3/P4 radiator during launch. Ground Flight Controllers subsequently unfurled the radiator, increasing the ability of the station to dissipate heat into space. Also, completed during this spacewalk was the retrieval of a materials exposure experiment from the outside of the ISS, maintenance on the P6 truss, installation of a wireless TV aerial and the replacement of the S1 truss' S-band antenna assembly. A number of "get-ahead" tasks previously scheduled for future missions were also performed during this spacewalk. Near the end of the spacewalk, the astronauts carried out a test to evaluate using infrared video of the leading edge of [[Space Shuttle Atlantis|Atlantis''']] wing to detect debris damage. After the spacewalk, the station's mobile transporter was