US Astronauts Reid Wiseman and Barry “Butch” Wilmore performed an Extra Vehicular Activity (EVA) beginning at 1216 GMT and lasting for 6 hours and 36 minutes on 15 October 2014. The main job of the astronauts on their spacewalk was to replace a Sequential Shunt Unit (SSU) in power channel 3A which failed in May. To avoid electrocution, the astronauts had to work in the dark of the orbital night when the attached array (one of eight) was not generating power. After trouble with a stuck bolt, the unit came away. The team then had difficulty re-bolting the replacement SSU, but in the end they succeeded.
With this main job done the astronaut pair then removed a broken camera and replaced it, and relocated a camera support mast and wireless transmitter before ending the spacewalk.
