Mission STS-118 - Flight Day 6

2007-08-13 - Flight Day 6 - While anchored to the foot restraint on the Canadarm2, Canadian Space Agency astronaut and STS-118 mission specialist Dave Williams, participates in the mission's second planned session of extravehicular activity as construction and maintenance continue on the International Space Station. During the spacewalk, astronauts and mission specialists Dave Williams and Rick Mastracchio (out of frame) removed a faulty control moment gyroscope (CMG-3) and installed a new CMG into the station's Z1 truss. (Credit: NASA)