On August 16, 2010 American astronauts Douglas Wheelock and Tracy Caldwell Dyson completed the third contingency spacewalk to install a spare ammonia pump module on the S1 Truss.
Flight Engineer Shannon Walker assisted the spacewalkers from inside the International Space Station and operated the Canadarm2. Flight Engineers Wheelock and Caldwell Dyson were outside during the third repair spacewalk for 7 hours and 20 minutes.
On August 11, 2010 American astronauts completed the second of three spacewalks to fix a failed cooling pump on the International Space Station (ISS).
During the spacewalk, which lasted 7 hours and 26 minutes, Expedition 24 Flight Engineers Tracy Caldwell Dyson and Douglas Wheelock removed the failed ammonia coolant pump module.
One of two cooling systems serving the ISS broke down late on July 31, and the crew had shut down several pieces of equipment, including two of the station's four gyroscopes, to cut the heat generated on board.
On July 27, 2010 Russian cosmonauts Fiodor Yurchikhin and Mikhail Kornienko performed the extra vehicle activities (EVA – space walk).
The cosmonauts installed a new TV-camera which is to monitor ATV rendezvous and docking to the Zvezda module of the Russian segment of the ISS. They also connected the "Rassvet” module’s control and data harness to the "Zarya” module, and laid Kurs system cabling between the 2 modules (Rassvet and Zarya).
On June 17, 2010 at 22:21 UTC (June 18 at 02:21 Moscow time) the Russian "Soyuz TMA-19” spacecraft with three crewmembers on board docked with the International Space Station (ISS), to the aft end docking port of the "Zvezda” service module.
The crew consisted of Russian cosmonaut Fyodor Yurchihin and American astronauts Douglas Wheelock and Shannon Walker.
When the hatches between the spacecraft and the ISS were opened, the three new crewmembers were welcomed by Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko as well as by U.S. astronaut Tracy Caldwell Dyson who had been aboard the station since April 2010.