posted 04-24-2023 11:14 AM               

On the upcoming Russian spacewalk

Cosmonauts Sergey Prokopyev and Dmitry Petelin continue to prepare for work outside the International Space Station.

The EVA, previously scheduled for April 26, 2023, was postponed, tentatively, to the beginning of May due to the need for a more detailed study of its tasks.

During the EVA, the cosmonauts will have to transfer the airlock with the European Robotic Arm (ERA) manipulator from the Rassvet module and dock it to the Nauka module.

The airlock is designed to transport payloads outside of the ISS with the help of a manipulator and return them inside the station in the interests of the applied scientific research program.

posted 05-03-2023 10:16 PM               

Cosmonauts relocate experiment airlock

Sergey Prokopyev and Dmitry Petelin completed their outing on Wednesday (May 3) at 11:11 p.m. EDT (0310 GMT May 4). During the 7 hour and 11 minute spacewalk, the cosmonauts oversaw the move of an equipment airlock from the side of one module to the side of another on the Russian segment of the space station.

Prokopyev and Petelin began the extravehicular activity (EVA) at 4:00 p.m. EDT (2000 GMT) by first making their way to the Rassvet mini-research module, where the soon-to-be-moved airlock had been mounted since its launch in May 2010. Once there, they disconnected six interface cables between the airlock and module, removed protective covers and unlocked launch locks to allow the airlock to be disconnected.

Once the equipment airlock was freed of its connections to Rassvet, Andrey Fedyaev worked from inside the station to grab hold of the airlock using the European Robotic Arm (ERA) and then slowly moved it from Rassvet to Nauka. As the 1,800-pound (816.5 kilogram) pressure vessel cleared its previous home, Prokopyev and Petelin cleaned up its former attach point, removing airlock tie rods and closing out insulation flaps.

They also bundled together some of the spent materials they would jettison overboard later in the spacewalk.

Prokopyev and Petelin then made their way over to Nauka to meet the airlock for its arrival. On their way, they stopped to inspect and photograph the radiator they earlier repositioned in preparation for their next spacewalk together on May 12, when they are scheduled to oversee the pressurization and deployment of the thermal control equipment.

The two cosmonauts next got into place to help Fedyaev align the airlock for its attachment to Nauka. With gentle and slow movements, the ERA manipulator brought the airlock into contact with the module, but Fedyaev could not get the airlock's latches to connect.

So, Prokopyev and Petelin moved in closer and with one on each side of the airlock, grabbed hold of it and held it in place. Only then was Fedyaev able to use the robotic arm to push the airlock the final way so the hooks could be driven closed.

Once capture was confirmed and a hard mating was achieved, Prokopyev and Petelin set to work making the power and data connections between the Nauka module and newly-installed airlock. There were six cables needing to be run, with a connector on each side. Some of the connectors' caps were unexpectedly held in place with tape, such that the cosmonauts had to carefully use a knife to cut away the adhesive.

With their work complete, Prokopyev and Petelin cleaned up their tools and translated back to the Poisk module to reenter the space station. Before going back inside, Prokopyev tossed overboard an 11-pound (5-kilogram) package of spent equipment and no longer needed items, including five pieces collected from prior spacewalks. The bundle will eventually fall back to Earth and burn it up in the atmosphere.

The spacewalk was the fifth for Prokopyev, who has now logged 37 hours and 2 minutes on EVA. It was the third for Petelin, who has spent 21 hours and 31 minutes spacewalking.

The EVA was the fifth for the year and the 262nd dedicated to the assembly and maintenance of the International Space Station.