Author Topic: LIVE: STS-120 Flight Day 6 - EVA-2 (Read 89913 times)

jmjawors · « **Reply #340 on:** 10/28/2007 09:23 pm »

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stockman - 28/10/2007 5:02 PM
If I just heard correctly they said they would be doing this about 15 minutes before or after crew wakeup which I think is around 11:15 or so tonight.

After. I remember MCC asking Peggy if they'd like to be told before hand so they could watch (and of course she said "yes"). Also, the NASA TV schedule has the first deploy at 11:53pm central (15 minutes after they wake up) and the next one at 12:23am.

Chandonn · « **Reply #341 on:** 10/28/2007 09:30 pm »

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psloss - 28/10/2007 6:12 PM

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Chandonn - 28/10/2007 6:04 PM

IF EVA 4 becomes R&R for the SARJ, remember that it is still a few days away. Time enough for the ground teams to look at the pics that Dan took of the SARJ, and time for the crew to examine the shaving samples he brought back in as well. Should be time to come up with some kind of theory or repair plan or decision to continue analysis.
No, all they are talking about is some varying degrees of more inspections of the current SARJ configuration. Any R&R for the parts of the SARJ they were looking at today would be a worst-case scenario, a major task, and Bill Harwood quoted Mike Suffredini as saying that would require "multiple spacewalks."

I missed the briefing, but thought I saw some notes about it a few pages back. Sorry for the confusion.

ICEINK · « **Reply #342 on:** 10/28/2007 09:35 pm »

What do you think about the SRB video? Is that the protection covers for the RCS system flying off by the port side? Impressive view.

ApolloLee · « **Reply #343 on:** 10/28/2007 09:47 pm »

From the "Discovery is Doomed" media file, our slight little problem with the rotary joint has become a "Sign of possible damage seen at space station" headline and a "disturbing discovery" in the AP story on CNN.com...

Andrewwski · « **Reply #344 on:** 10/28/2007 09:51 pm »

What else is new...how long until they [the media] start mentioning abandonment?

wannamoonbase · « **Reply #345 on:** 10/28/2007 10:12 pm »

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stockman - 28/10/2007 5:55 PM
In fact I might hazard my own guess - based on the press conference - they said that the current draw indicating resistance has recently been trending down. It is quite possible that some debis got ground up in there thus creating the shavings and that it is in the process of cleaning itself out through use. Obviously this is one of many possible options but I get the impression that this could be something very simple to cure down the road and even if it is a major failure, they have spares to work a repair on some future mission....

No urgency here...

I agree stockman, well at least on the guess level anyway. If the current draw has dropped and not increased that is a good thing.

Also, no need to go nuts and start jacking around with the joint until you have a plan, when in doubt do nothing.

Clean out anything obvious and watch the data.

Chandonn · « **Reply #346 on:** 10/28/2007 10:15 pm »

I'm thinking a small magnet might work as a "vacuum-cleaner in a vacuum"

nathan.moeller · « **Reply #347 on:** 10/28/2007 10:30 pm »

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psloss - 28/10/2007 4:33 PM

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nathan.moeller - 28/10/2007 5:29 PM

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Lee Jay - 28/10/2007 4:18 PM

Is it just me, or did guidance seem to wander around a lot more than usual?

It seemed to roll around a bit more than usual. Probably just wind.
Yeah, I was thinking wind shear or something like that -- I wouldn't chalk that up to guidance wandering.

Hopefully Mark or Jorge or Jim are around and can fill in with details on first stage guidance (or maybe that's been answered in one of the Q&A threads already). Anyway, I believe guidance doesn't converge (become "closed loop") until second stage (OPS 103).

Going by the fact that Rob Navias always says 'Guidance now converging' after SRB sep, I believe that is correct. But sometimes wind shears can shove the vehicle around a bit and the guidance has to correct the trajectory of the stack. The greatest wind shear ever encountered by a vehicle was STS-51L when Challenger passed through a hurricane-force shear that finally led to her demise. But a little rolling around can be expected. The winds aren't always dead calm during launch.

psloss · « **Reply #348 on:** 10/28/2007 10:42 pm »

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nathan.moeller - 28/10/2007 7:30 PM

Going by the fact that Rob Navias always says 'Guidance now converging' after SRB sep, I believe that is correct. But sometimes wind shears can shove the vehicle around a bit and the guidance has to correct the trajectory of the stack. The greatest wind shear ever encountered by a vehicle was STS-51L when Challenger passed through a hurricane-force shear that finally led to her demise. But a little rolling around can be expected. The winds aren't always dead calm during launch.

There's documentation on L2 on first and second stage ascent guidance.

STS-107 went through wind shear and the vehicle response was noticeable, and then during the accident investigation, a similar event was noted on the STS-90 launch. It's easier to see on the vehicle cameras and you can see some amount of this on any of the aft-facing SRB videos on previous missions.

David AF · « **Reply #349 on:** 10/28/2007 11:41 pm »

Chris, what do you make of the problem?

rdale · « **Reply #350 on:** 10/28/2007 11:50 pm »

I'm not Chris (nor do I play him on TV :> ) but obviously the shuttle made it through the wind shear or whatever it was just fine... I'd be hard-pressed to call that a "problem" (even in the AP sense of the word!)

Chris Bergin · « **Reply #351 on:** 10/29/2007 12:31 am »

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David AF - 29/10/2007 1:41 AM

Chris, what do you make of the problem?

You know, I don't know enough about the SARJ to give a useful answer, and I don't ever like to 'copy' other media with the quoting from the press conference, less so go for the dramatics of some wire reports.

I'm waiting for L2's On Orbit Status report, which is the bible of current status, straight down the middle facts. Then we'll have a better idea, and we'll go from there.

jbk024 · « **Reply #352 on:** 10/29/2007 12:45 am »

Chris:

Your answer highlights why I appreciate this site so much. I'm confideent the SARJ issues will be investigated and dealt with in due course, and I'd much rather spend my time reading real information and/or informed speculation than the sensationalistic crap (pardon my language) on the mainstream news service sites.

Chris Bergin · « **Reply #353 on:** 10/29/2007 01:48 am »

Thanks.

And that report is in.

Notes that "for now, where possible the Stbd SARJ will be parked," rather than it's going to be locked down in position.

STS-122 - which has moved up the rollover timeline - isn't threatened...they'll need it sorting in time for the JAXA missions....but they'll work a plan in the meantime.

Will write it up.

haywoodfloyd · « **Reply #354 on:** 10/29/2007 01:53 am »

Where would I find the SRB videos?
Thanks.

rdale · « **Reply #355 on:** 10/29/2007 02:04 am »

Is the "not threatened" an official word? Another "hot" blog says that they won't launch the next mission unless that's fixed...

Chris Bergin · « **Reply #356 on:** 10/29/2007 02:10 am »

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rdale - 29/10/2007 4:04 AM

Is the "not threatened" an official word? Another "hot" blog says that they won't launch the next mission unless that's fixed...

More so, that's from Mike Suffredini - who said they are ok for Columbus with what they've already got, even if Starboard S4 has to be left locked in place.

rdale · « **Reply #357 on:** 10/29/2007 02:11 am »

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haywoodfloyd - 28/10/2007 10:53 PM

Where would I find the SRB videos?

They've been replaying every hour since crew sleep - keep checking NASA TV or wait for the announcement in the video thread.

Thanks for clarifying Chris...

blazotron · « **Reply #358 on:** 10/29/2007 02:20 am »

This might well have been answered somewhere, but I can't find it through a search (although that may be a function of not knowing what to search for). I'm trying to figure out what all the regions and labels on the world map with ISS and shuttle orbits they sometimes have up in MCC and on the NASA TV feeds when there isn't more interesting stuff to show, as we have seen several times today. For instance here:
http://forum.nasaspaceflight.com/forums/get-attachment-big.asp?action=view&attachmentid=33213

I know some of the labels are SAA: South Atlantic Anomoly and ZOE: Zone of Exclusion, although I am not sure exactly what the ZOE is. There are some small roundish regions over Asia with labels lie SHKR, ULDM, USKR, PPKR, which be the ranges where the Russian ground stations can the station, but I am not sure. There are also three large regions roughly centered around the Sahara, southern Mexico, and Austrailia. I'm thinking these might be the ranges of the TDRSS satellites, but they do seem to roughly correlate to the locations of the large DSN dishes in CA, Spain, and Austrailia. Thanks for the help.

HIPAR · « **Reply #359 on:** 10/29/2007 02:22 am »

Metal shavings grinding inside precision machinery cannot be a trivial matter. I'm guessing damage that will accelerate the failure of the joint has already occurred.

--- CHAS