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Author
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Topic: [Discuss] Progress MS-21 (ISS 82P) spacecraft
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Robert Pearlman
Editor Posts: 49988
From: Houston, TX
Registered: Nov 1999
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posted 10-25-2022 07:22 PM
   
This thread is intended for comments and questions about the Progress MS-21 cargo supply mission to the International Space Station. |
MSS
Member Posts: 994
From: Europe
Registered: May 2003
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posted 10-28-2022 02:09 AM
International Space Station configuration after Progress MS-21 (P82) docking. |
Robert Pearlman
Editor Posts: 49988
From: Houston, TX
Registered: Nov 1999
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posted 02-11-2023 11:36 AM
An exterior coolant leak, similar to what was seen on Soyuz MS-22, was recorded this morning (Feb. 11) with Progress MS-21, according to Roscosmos and NASA. The leak is now being investigated.The following was radioed to the space station's crew by Mission Control in Houston (via CBS News' Bill Harwood on Twitter): You guys are probably already aware we had that TCS [thermal control system] coolant leak out to space this morning. The leak has stopped but at this point, we believe that it's completely leaked out.So not concerned from having an active leak on the Progress right now. From our perspective, the system is in a good, stable configuration. The Russians configured 82P [MS-21] to a dormant low-power mount, just keeping essential equipment powered. The forward plan is "keep the vehicle as is, so there's no additional troubleshooting or any actions that will be done in the short term. We're still targeting undocking at the end of next week. But of course, plans might change. |
SkyMan1958
Member Posts: 1277
From: CA.
Registered: Jan 2011
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posted 02-11-2023 01:02 PM
Does anyone know if the coolant leak on the Progress is from the same general area as that on the Soyuz? One coolant leak seems like an accident easily attributable to an orbital debris strike. Two orbital leaks seems like a trend. Statistically it seems a remote chance that orbital debris would hit the same sort of spacecraft in the same sort of area, and not hit anything else on the ISS in a significant way. |
Robert Pearlman
Editor Posts: 49988
From: Houston, TX
Registered: Nov 1999
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posted 02-11-2023 02:34 PM
According to Anatoly Zak on Russian Space Web, the leak appears to have originated from the same general area as the Soyuz MS-22 issue. As to the cause(s)... In a video statement issued on February 11, Sergei Krikalev, the head of piloted space flight at Roskosmos, admitted that the leak aboard Progress MS-21 resembled the incident with Soyuz MS-22 and hinted that the original conclusion about its causes could now be in doubt. He said that the careful analysis would have to rule out a possibility of a common issue affecting the upcoming launches. |
brianjbradley
Member Posts: 152
From: Toronto, Ontario, Canada
Registered: Dec 2010
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posted 02-11-2023 05:05 PM
I feel a little bit bad for Sergei Prokopyev. His Soyuz in 2018 loses integrity due to a hole, his Soyuz in 2022 loses coolant and now a Progress supporting his mission loses coolant. None of this is his fault, but the man is cursed. |
SkyMan1958
Member Posts: 1277
From: CA.
Registered: Jan 2011
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posted 02-21-2023 08:20 PM
While I would expect the thermal control/radiator to be in essentially the same place on the Progress and Soyuz spacecraft, if you look, the location between the Progress MS-21 hole and the Soyuz MS-22 hole are very close to the same spot on the two craft. If you are looking at the Progress MS-21 image, the hole is located at roughly the 5 o'clock position relative to the silvery post that sticks up from the module surface. Assuming you use the same orientation of the silvery post as the Progress MS-21 image for the Soyuz MS-22 image provided in the Soyuz MS-22 discussion thread, the Soyuz MS-22 hole is at roughly the 8 o'clock position compared to the silvery post. The Soyuz MS-22 hole is a bit further away from the silvery post than the Progress MS-21 hole, but certainly not much further away.  I wonder what the odds are that two Russian spacecraft that share various modular elements would be struck by micrometeors in almost exactly the same spot, particularly when they are docked to different docking ports on the ISS? Statistically remote events can occur, but I find it very hard to believe that the two events are not related, most likely from some poorly engineered part failing. |
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