Author Topic: LIVE: ISS US spacewalk (EVA-20) - November 1, 2012  (Read 84055 times)

Offline Dappa

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #20 on: 10/21/2012 11:00 pm »
That is a great article Pete! It really sums up everything that we, the readers, need to know: how the EPS should work, how it actually worked, what will happen, what might happen, and why.
« Last Edit: 10/21/2012 11:00 pm by Dappa »

Offline robertross

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #21 on: 10/21/2012 11:45 pm »
Right everyone, get your eyeballs wrapped around this epic article by Pete!

http://www.nasaspaceflight.com/2012/10/iss-program-spacewalks-repair-power-channel-faults-station/

Epic, indeed! Great article Pete! I can see you put a lot of time and effort into that one. Superb.

I have to wonder though, are they certain that the EETCS they plan to use is 'leak free' after all these years? I guess we'll have to wait and find out.

This, to me (as I have been harping about it for some time) is an important note: "The leaking PVTCS RVR could potentially be replaced in future with a spare radiator located on ExPrESS Logistics Carrier-4 (ELC-4), which was launched on STS-133 in February 2011, however that is the only spare radiator aboard the ISS, and with the Space Shuttle now retired, no vehicles currently in service or even on the drawing board are capable of launching additional spare radiators, due to their large size."

Let's hope (maybe pray), there is no need of the spare radiator, or the station would be at the mercy of lack of available spares for conducting science at current utilization (note I didn't say 'full').

Thanks, Mr. ISS  :)
« Last Edit: 10/21/2012 11:45 pm by robertross »

Offline Prober

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #22 on: 10/22/2012 12:02 am »
Right everyone, get your eyeballs wrapped around this epic article by Pete!

http://www.nasaspaceflight.com/2012/10/iss-program-spacewalks-repair-power-channel-faults-station/

Wow, great stuff.....you out did yourself Pete.

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Offline arachnitect

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #23 on: 10/22/2012 12:07 am »

This, to me (as I have been harping about it for some time) is an important note: "The leaking PVTCS RVR could potentially be replaced in future with a spare radiator located on ExPrESS Logistics Carrier-4 (ELC-4), which was launched on STS-133 in February 2011, however that is the only spare radiator aboard the ISS, and with the Space Shuttle now retired, no vehicles currently in service or even on the drawing board are capable of launching additional spare radiators, due to their large size."

Let's hope (maybe pray), there is no need of the spare radiator, or the station would be at the mercy of lack of available spares for conducting science at current utilization (note I didn't say 'full').


Are there spare radiators on the ground? The one on ELC 4 may be the only flight qualified unit (?).

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #24 on: 10/22/2012 12:17 am »
Thanks for the compliments Dappa, robertross and Prober - it means a lot. (And thanks to Downrange for the typo - will get it corrected.) I must also thank anik for posting the very timely info in the first place. :)

I agree the situation regarding a lack of spare radiator launch capability is bad - although Elon Musk is on record as saying that he will enlarge the Dragon trunk to suit any of NASA's needs if required - but quite how he would do that is unknown. I don't even know if there are any spare radiators on the ground - I wonder what the lead time for manufacturing one is, even if it did have a ride up to the ISS.

I wonder if they could somehow remove the other EETCS radiator from the P6 Truss and replace the leaky radiator with that?
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Offline robertross

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #25 on: 10/22/2012 12:26 am »
Thanks for the compliments Dappa, robertross and Prober - it means a lot. (And thanks to Downrange for the typo - will get it corrected.) I must also thank anik for posting the very timely info in the first place. :)

I agree the situation regarding a lack of spare radiator launch capability is bad - although Elon Musk is on record as saying that he will enlarge the Dragon trunk to suit any of NASA's needs if required - but quite how he would do that is unknown. I don't even know if there are any spare radiators on the ground - I wonder what the lead time for manufacturing one is, even if it did have a ride up to the ISS.
Yes, anik was a great source of info (thanks anik)

I honestly doubt Elon could make that happen, but honestly, if anyone could make such a feat happen, is his DESIRE to MAKE it happen.

Quote
I wonder if they could somehow remove the other EETCS radiator from the P6 Truss and replace the leaky radiator with that?
I don't know about that...I doubt there is commonality in the design, but we'll leave that to the experts.

Time will always be the issue for spares. At least they have a spare on orbit (thank godness for that luck). But it still shows the fragility of the system. They need to be thinking of a replacement (on the ground), as well as a spare SAW blanket box on the ground (IMHO). 
« Last Edit: 10/22/2012 12:27 am by robertross »

Offline Lee Jay

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #26 on: 10/22/2012 02:11 am »

Offline Dappa

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #27 on: 10/22/2012 07:24 am »
Quote
I wonder if they could somehow remove the other EETCS radiator from the P6 Truss and replace the leaky radiator with that?
I don't know about that...I doubt there is commonality in the design, but we'll leave that to the experts.
The EETCS radiators are actually identical to the PVTCS radiators.

Offline Chandonn

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #28 on: 10/22/2012 08:54 am »
Quote
I wonder if they could somehow remove the other EETCS radiator from the P6 Truss and replace the leaky radiator with that?
I don't know about that...I doubt there is commonality in the design, but we'll leave that to the experts.
The EETCS radiators are actually identical to the PVTCS radiators.

I was thinking that I had read somewhere that they would be spares to the PVTCS after the EETCS was deactivated...
« Last Edit: 10/22/2012 08:54 am by Chandonn »

Offline brahmanknight

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #29 on: 10/22/2012 01:00 pm »
Pete, you've outdone yourself.   Amazing piece. 

Offline anik

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #30 on: 10/22/2012 01:38 pm »
I have forgotten to say: according to Robert Navias, there will be only one unscheduled spacewalk in November because the problem with DCSU 3A has been successfully resolved.

As for radiators, EEATCS radiator is identical to PVTCS radiator - they both have seven sections, but EEATCS radiator is not identical to EATCS radiator, which has eight sections.

Offline psloss

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #31 on: 10/22/2012 02:08 pm »
I have forgotten to say: according to Robert Navias, there will be only one unscheduled spacewalk in November because the problem with DCSU 3A has been successfully resolved.
Thanks, anik -- I was wondering about that, too, given the trip hasn't repeated so far.

Offline psloss

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #32 on: 10/22/2012 03:59 pm »
A few more details on task outline from today's On-Orbit Status:
http://www.nasa.gov/directorates/heo/reports/iss_reports/2012/10222012.html

Quote
Suni & Aki joined up for a 3-hr review of preliminary EVA-20 objectives, procedures and requirements, including study of the on-orbit QD (quick disconnect) trainer for a refresher course on FQDs (Fluid QDs) carrying NH3 (Ammonia) coolant. [EVA-20 will focus on the 2B power channel and the ammonia leak in the P6 truss. The data shows the leak in the loop has accelerated, and that channel could be off-line by the end of the year if the leak trend continues. Objectives of the 6h30m spacewalk on 11/1 include EAS (Early Ammonia System) jumper reconfigurations, demating the FQDC (Flight Quick Disconnect Coupling) of the 2B PVR (Photovoltaic Radiator), removal & stowage of the TTCR shroud, plus release & deployment of TTCR, with photography and contingency time.]

Offline anik

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #33 on: 10/26/2012 08:27 am »
http://www.cbsnews.com/network/news/space/home/spacenews/files/102512_tma06m_docking.html

"The day after the Progress launch, on Nov. 1, Williams and Hoshide plan to carry out a complex six-and-a-half-hour spacewalk to bypass an ammonia leak in the coolant system of the station's far left-side set of solar arrays. The system circulates ammonia through a large radiator to dissipate heat, and if the leak isn't resolved soon, the station could lose one of its power channels.

As it turns out, the port-six set of solar arrays includes spare radiators that were used during the early stages of station construction. Williams and Hoshide plan to install jumpers that will route ammonia to one of the currently stowed spare radiators, bypassing components that may be responsible for the leak. The radiator then will be redeployed to restore normal cooling"

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #34 on: 10/26/2012 08:35 am »
http://www.cbsnews.com/network/news/space/home/spacenews/files/102512_tma06m_docking.html

"The day after the Progress launch, on Nov. 1, Williams and Hoshide plan to carry out a complex six-and-a-half-hour spacewalk to bypass an ammonia leak in the coolant system of the station's far left-side set of solar arrays. The system circulates ammonia through a large radiator to dissipate heat, and if the leak isn't resolved soon, the station could lose one of its power channels.

As it turns out, the port-six set of solar arrays includes spare radiators that were used during the early stages of station construction. Williams and Hoshide plan to install jumpers that will route ammonia to one of the currently stowed spare radiators, bypassing components that may be responsible for the leak. The radiator then will be redeployed to restore normal cooling"

The ISS will look like this after the deployment of the spare radiator....
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery.

Offline anik

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #35 on: 10/26/2012 06:43 pm »

Offline John44

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #37 on: 10/26/2012 10:41 pm »
Exp 33 Spacewalk Overview Briefing

NASASpaceflight ISS Writer

Offline Prober

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Re: ISS US spacewalk (EVA-20) - November 1, 2012
« Reply #38 on: 10/27/2012 12:40 am »
Some interesting info on SPX at the end as well.
« Last Edit: 10/27/2012 12:41 am by Prober »
2017 - Everything Old is New Again.
"I fear all we have done is to awaken a sleeping giant..." --Isoroku Yamamoto


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