Roscosmos reports a pressure drop in the Russian ISS module Zvezdá

The general director of the Russian space agency (Roscosmos), Dmitri Rogozin, reported today of a pressure drop in the transfer chamber of the Russian Zvezdá module of the International Space Station (ISS).

"I just saw the pressure reports: 14.07, 473mm; 20.07, 273mm; 25.07, 200mm," Roscomos Chief Executive Officer wrote on Twitter.

He added that the pressure in the transfer chamber fell to 160 mm last Thursday, the day the Russian multipurpose scientific module Naúka was attached to the Zvezdá, a maneuver that due to spontaneous ignition of its thrusters caused a change in the orientation of the ISS. 45 degrees, which had to be corrected.

Rogozin, who stressed that this situation is not related to the coupling of the Naúka said, this is an expected pressure drop, and not abrupt, in the Zvezdá module, which still has problems.

The first air leak in the Zvezdá module, caused by a 4-centimeter long crack, was detected and sealed in September 2020, but the pressure continued to decrease although to a lesser extent. In March this year, ISS crewmembers sealed two more cracks in the Zvezdá, but the hermetic tests of the module found that it continued to lose pressure.

According to Roscosmos, these small air leaks do not represent any danger for the crew of the orbital platform since they can be compensated with the resources on board. The Russian space agency specified that the transfer chamber of the Zvezdá module is isolated from the main volume of the Station.

Currently, the ISS crew includes Russians Piotr Dubrov and Oleg Noviski, Americans Shane Kimbrough, Megan McArthur, and Mark Vande Hei, Frenchman Thomas Pesquet, and Japanese Akihito Hoshide.

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