STS-115 MS Stefanyshyn-Piper works on P3/P4 Trusses during third EVA

S115-E-06214 (15 Sept. 2006) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, participates in her second spacewalk this week and the second one of her career as extravehicular work wraps up for the Atlantis crewmembers and their colleagues aboard the International Space Station. The STS-115 and Expedition 13 crewmembers shared various tasks for three spacewalks this week, marking the resumption of construction on the orbital outpost.