On September 1, 2016 American astronauts Jeffrey Williams and Kathleen Rubins performed the spacewalk for retracting a spare cooling radiator, installing two high-definition TV cameras and inspecting a massive solar array rotation mechanism that has experience subtle vibrations in recent months. The EVA lasted 6 hours and 48 minutes. It was the 5^th spacewalk for Jeffrey Williams and the 2^nd spacewalk for Kathleen Rubins.