The second planned International Space Station spacewalk to repair a faulty pump module will take place on Dec. 24, and NASA will cover all the action via a live stream of the mission beginning at 6:15 a.m. EST, 3:15 a.m. PST.
On Saturday, Dec. 21, NASA astronauts Rick Mastracchio and Mike Hopkins completed a spacewalk that put the space agency ahead of schedule in regards to the repair mission. NASA had scheduled three spacewalks to fix a broken ammonia pump module, used to cool internal and external instruments, but during the five-and-a-half-hour spacewalk on Saturday, the astronauts were able to remove the pump module, a task scheduled for the second spacewalk.
During the spacewalk, Mastracchio was attached to a robotic arm controlled by JAXA astronaut Koichi Wakata with Hopkins setting up at the Starboard 1 truss segment. The astronauts detached the fuel lines, prepared the storage unit and removed the pump module. The second spacewalk was scheduled for Dec. 23, but an issue with Mastracchio's space suit (water got into it while the astronauts were inside the airlock) delayed the mission.
NASA chose to use a spare space suit and the time was spent resizing the suit for Mastracchio. According to NASA, Mastracchio, Hopkins and Wakata reviewed the upcoming spacewalk on Monday. Hopkins will be attached to the ISS' robotic arm during the second spacewalk. The astronauts will obtain a replacement pump module from the External Stowage Platform 3, install the module, and reattach the four fluid lines and five electrical connections before activating the pump and restoring the ISS' cooling system to full power.
If the spacewalk goes as scheduled, NASA will not need to conduct a third spacewalk, but the Expedition 38 crew will remain quite busy. Russian cosmonauts Sergey Ryazanski and Oleg Kotov will conduct a spacewalk on Friday to install two cameras on the Zvezda service module and performing maintainence on external experiment packages, reports NASA.
The ISS spacewalk live stream will begin at 6:10 a.m. EST and can be viewed below. The mission will start at 7:10 a.m. EST.