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#520
by
RamjetFDO
on 08 Jul, 2011 16:05
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You don't hold off launching a rocket just to make sure you can see it all the way up in case of an accident 
EXACTLY.
You hold off to make sure it can find its way *BACK*... which, for the record, I'm glad that none of the RTLS or TAL simulations we did ever had to be exercised for real!!!
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#521
by
Austin
on 08 Jul, 2011 16:05
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One piece of business...can someone explain the reason for that final hold.
The GLS didn't get the standard indication that the GOX vent arm was retracted...that's at like T-33 sec. (Or maybe T-37...a little help?)
1-shot verification at T-40, at least in my ancient GLSDD (STS-51 era). LCC GSE-13, verification of GVA retract.
There are six indications, grouped into two sets of three. In each set of three, there are two retract switch discretes and an analog position indication (in degrees). The minimum requirement (as of STS-51) was 2 of 3 in *either* set. Discretes needed to be ON, position needed to be less than 2 deg.
The milestone inhibit is against MSEQ (T-31 sec).
The little bit of extra delay I suspect was due to GLS needing "pro words" from the NTD to reset the milestone inhibit prior to resuming the count. Even though the systems folks had verified the GVA position via camera, which you could hear on the loop, she needs to hear explicit direction thru the proper LCC chain of command before clearing the hold.
Good to see you here again, John. Today must have been tough for you.
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#522
by
Chris Bergin
on 08 Jul, 2011 16:05
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#523
by
psloss
on 08 Jul, 2011 16:05
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#524
by
TJL
on 08 Jul, 2011 16:05
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Godspeed Atlantis and her crew....what an historic day!
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#525
by
d3jf
on 08 Jul, 2011 16:06
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Just wanted to say a quick thank you to you folks for the great live coverage and especially Chris and his team for the mobile version of the forum, as I'm sitting at my step sister's wedding table.
Godpeed Atlantis!
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#526
by
Chris Bergin
on 08 Jul, 2011 16:06
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Good config for the OMS-2 burn.
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#527
by
psloss
on 08 Jul, 2011 16:07
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OMS-2 burn underway.
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#528
by
Chris Bergin
on 08 Jul, 2011 16:07
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OMS burning.
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#529
by
mrbliss
on 08 Jul, 2011 16:08
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Awesome launch!
Looks like Atlantis was eager to fly, but 39A didn't want to let her go.
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#530
by
STS-134
on 08 Jul, 2011 16:08
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He said on the first launch of STS-1 30 years ago, they had a hold at 31 seconds, when the computers froze. Imagine, the first and the last going into a hold at exactly 31 seconds!
I'm going to have to talk to Jim...I don't think they did on STS-1. (STS-2 did and on STS-1, the milestone was probably at T-27.)
As Rob wrote, T-31 seconds is a GLS milestone and a standard place for the launch processing system to hold. (It's the last place to hold without having to recycle.)
Just wondering...why is it that they always aim to launch in the
middle of the launch window? Given that issues like this can come up (and, for example, the range safety issue that almost caused another scrub of STS-133), why don't they aim to launch toward the
beginning of the window, so that should an issue occur, they have more time to correct it before the window expires?
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#531
by
Ronsmytheiii
on 08 Jul, 2011 16:08
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About fell over at t-31 sec hold but amazing view from causeway, cleared right up at launch enough. Will post pics when have sd card reader
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#532
by
psloss
on 08 Jul, 2011 16:08
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Good OMS-2 burn no further trim required.
(Removed map still...doesn't look right.)
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#533
by
Chris Bergin
on 08 Jul, 2011 16:09
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Good burn, no trim required
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#534
by
LendMeYourYears
on 08 Jul, 2011 16:09
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I've not heard the scrub reason, so it may be true, but the timer prevents it from transmitting over countries it's not allowed to transmit on.
ITAR style stuff? Did they just get it cleared this time round or is the transmission taking a different route?
Also - in addition to the long rod-shaped object at ET sep, there was another one much earlier on the starboard side. Noticed it because it made a beautiful arc, and went close (still way far away from impact) to starboard OMS pod..
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#535
by
Jason1701
on 08 Jul, 2011 16:09
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NSF record!
Most Online Today: 3045. Most Online Ever: 3045 (Today at 12:06:08)
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#536
by
Rocket Science
on 08 Jul, 2011 16:10
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No deltas...
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#537
by
Chris Bergin
on 08 Jul, 2011 16:12
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NSF record!
Most Online Today: 3045. Most Online Ever: 3045 (Today at 12:06:08)
And that's only a estimate, as the forum software counts standard browsers, not mobile views etc. Site's swamped, servers all did their job throughout, thanks to L2 members paying for these servers
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#538
by
rdale
on 08 Jul, 2011 16:12
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ITAR style stuff?
No, just an interference thing... I have a ham radio that can transmit in 144-148MHz range, but not every country in the world allows that for the general public. So I might interfere with the Belgium Fire Department if I transmitted while flying over them. As I recall since it was a one-off there were no objections from other countries.
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#539
by
steveS
on 08 Jul, 2011 16:14
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Sandy Magnus now in the middeck
