[FPSPACE] Soyuz hole investigation....latest

bart hendrickx bhen at telenet.be
Fri Sep 14 18:02:05 EDT 2018


https://tass.ru/kosmos/5564539

According to TASS, Soyuz MS-10 commander Aleksei Ovchinin confirmed to reporters today (prior to a pre-flight exam at Star City) that he and Sergei Prokopyev will be performing a spacewalk. A date has not yet been set.  Last Saturday Ovchinin had already told journalists that one of the tasks for the EVA would be to investigate the Soyuz leak. See this RIA Novosti report:
https://ria.ru/science/20180908/1528090322.html

More reports on the leak from RIA Novosti today, all quoting "sources in the space industry” (for whatever they’re worth):

https://ria.ru/science/20180914/1528541433.html

The EVA is reportedly scheduled for November-December and a second EVA may be added if the cosmonauts cannot finish all the work in a single EVA. 

https://ria.ru/science/20180908/1528090322.html

Roscosmos is considering to propose NASA to do a joint Russian-US spacewalk "so that international partners would have no reasons to mistrust the Russian investigation".

https://ria.ru/science/20180914/1528533828.html

A slight drop in pressure aboard the station was already noticed in the two to three days prior to the moment that the crew was alerted, but it was below the threshold of 0.5 mmHg considered necessary to take action. It was only when the pressure drop rose to 0.8 mmHg that the crew was informed. The gradual drop in pressure is not consistent with the crew itself being responsible for the leak. "If any of the crew members had drilled the hole, on-board sensors would have noticed a sudden drop in pressure", RIA Novosti's source said. 


Bart Hendrickx

> Op 14 sep. 2018, om 21:38 heeft Peter Pesavento <pjp961 at svol.net> het volgende geschreven:
> 
> Again, from our own Anatoly Zak
>  
> http://www.russianspaceweb.com/soyuz-ms-09-hole.html#spacewalk <http://www.russianspaceweb.com/soyuz-ms-09-hole.html#spacewalk>
>  
>  
> A spacewalk may be planned  to be performed to examine the habitable module from the outside
>  
>  
>  
> Spacewalk planned to test Soyuz hole theory
>  
> In order to confirm the leading hypothesis that the hole aboard Soyuz MS-09 was drilled on the ground, Russian space officials began planning a spacewalk on the exterior of the station. 
> 
> If substantial traces of the sealant can be found on the exterior of the spacecraft, they could help to prove the theory that the hole was drilled from the inside during the production of the spacecraft, but it was then patched up from the exterior side of the spacecraft. The crew found no traces of the sealant inside the module, but the endoscope examination showed what appeared to be scratches from the drill on the internal side of the meteoroid shield.
> 
> According to industry sources, the simulations conducted on the ground indicated that when a generally available sealant (which can be purchased at a regular hardware store), is applied to the hole from the exterior, it could hold up to one atmosphere of pressure difference, industry sources told RussianSpaceWeb.com <http://russianspaceweb.com/>.
> 
> The inspection showed that even with the micrometeoroid shielding installed, it might be possible to reach the hole from the exterior of the spacecraft. The meteoroid shielding could also help to cover up the sealant, which otherwise could be detected during the visual inspection of the spacecraft.
> 
> If the spacewalk is attempted, the cosmonauts would have to get to the Habitation Module <http://www.russianspaceweb.com/soyuz_bo.html>, peel off soft thermal layers blanketing the spacecraft and then cut through the meteoroid shielding bordering this section of the spacecraft at a distance of around 1.5 centimeters from its pressurized hull.
> 
> To access the area of the hole on the exterior of the Soyuz, Russian officials are developing a spacewalk scenario relying on the available Strela boom, GStM, currently stored on the exterior of the Zarya FGB <http://www.russianspaceweb.com/iss_fgb.html> module. The telescopic device can be used to carry a cosmonaut secured to a special anchor at the end of the boom to a location aboard the station otherwise inaccessible to spacewalkers due to lack of railings.
> 
>  
> 
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