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#500
by
Rocket Science
on 08 Jul, 2011 15:55
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Closing ET doors
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#501
by
Chris Bergin
on 08 Jul, 2011 15:56
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PRW and SSME teams getting props for their work over 30 years. Let's hope they get more TV time via SLS (if you're that way inclinded
)
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#502
by
steveS
on 08 Jul, 2011 15:56
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Amazing Atlantis !
. Third consecutive on time launch ! STS-129, 132 and 135 !
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#503
by
rdale
on 08 Jul, 2011 15:56
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Imagine, the first and the last going into a hold at exactly 31 seconds!
31 seconds is a pre-determined time, so while a good coincidence it wasn't really that out of the ordinary.
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#504
by
psloss
on 08 Jul, 2011 15:56
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Amazing Atlantis ! . Third consecutive on time launch ! STS-129, 132 and 135 !
Um, no, not today.
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#505
by
Alboita
on 08 Jul, 2011 15:57
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I add my compliments, this is a piece of history. This is the last, but this will remain on our mind forever.
Godspeed to Space Shuttle Atlantis STS-135 and the crew. 
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#506
by
jcopella
on 08 Jul, 2011 15:57
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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The GLS didn't get the standard indication that the GOX vent arm was retracted...that's at like T-33 sec.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.
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#507
by
LendMeYourYears
on 08 Jul, 2011 15:57
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Why did they ever have a cutoff timer? 
Described in other threads but it's essentially to save battery incase of a scrub.
Aah..thanks. I would've thought it might be better to just turn it after launch, but then there's probably some other reason.
But yes, now that that's done; I'm getting my trainers.
If this turns out to be anything like Discovery, I'm going to need to grab a pair of trainers and run off the adrenalin post MECO. 2 seconds of hold time left is a bit exhilirating... But if they're looking at RTLS as the only concern, that probably won't happen..
That T-31 hold => I guess
she's always right. (When she's the shuttle atleast)
That was AWESOME.
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#508
by
Nick L.
on 08 Jul, 2011 15:57
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#509
by
psloss
on 08 Jul, 2011 15:58
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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.)
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#510
by
Nick L.
on 08 Jul, 2011 15:58
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#511
by
Nick L.
on 08 Jul, 2011 15:59
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#512
by
rdale
on 08 Jul, 2011 15:59
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Why did they ever have a cutoff timer?
Described in other threads but it's essentially to save battery incase of a scrub.
Aah..thanks. I would've thought it might be better to just turn it after launch, but then there's probably some other reason.
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.
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#513
by
psloss
on 08 Jul, 2011 16:00
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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.
Thanks, John. Kind of a throwback to hold at T-31, but in this case didn't think there was any doubt they would pick up in time.
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#514
by
Brian Mc
on 08 Jul, 2011 16:00
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Imagine, the first and the last going into a hold at exactly 31 seconds!
31 seconds is a pre-determined time, so while a good coincidence it wasn't really that out of the ordinary.
True enough.
And it was STS-2 that had that "first" T-31 hold. Remember it well.
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#515
by
Mapperuo
on 08 Jul, 2011 16:01
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Looking at some of these replays it makes you wonder if they can gain any technical insight if they had to, The cloud cover makes it very hard to see the Shuttle at times.
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#516
by
kirghizstan
on 08 Jul, 2011 16:01
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Thanks to the amazing NSF team for all the support over the years! I've been a quiet observer here for quite a while. Sad to see the engines fall silent for the last time.
One piece of business...can someone explain the reason for that final hold.
Thanks Astro. GOX Vent Hood retraction wasn't registering as fully retracted, but they confirmed it was out of the way and proceeded.
It was like a parent not wanting to let go on the first day of school or when a kid goes to college. So sad but so proud. it was KSC last attempt to keep its baby from growing up.
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#517
by
csmjr91090
on 08 Jul, 2011 16:02
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It's been a heck of a ride in the 20 or so years I've had the privilege of watching this amazing vehicle launch into space and better our way of life and thinking. Today I feel a sense of loss and hope that this isn't the end, but a new beginning.
What keeps my hope alive is the same American ingenuity that fueled the Apollo & Shuttle Programs, will create the next generation of space vehicles for the USA.
To all the dedicated workers that have made the Shuttle program possible, THANK YOU! You are a true inspiration.
To NSF: Thanks for the excellent in depth coverage that is unrivaled anywhere on the internet. Looking forward to when new missions will be covered, as this is certainly the place to come.
Godspeed Atlantis and the STS 135 Mission, see you back here at EOM.
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#518
by
rdale
on 08 Jul, 2011 16:02
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Looking at some of these replays it makes you wonder if they can gain any technical insight if they had to, The cloud cover makes it very hard to see the Shuttle at times.
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
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#519
by
Mapperuo
on 08 Jul, 2011 16:04
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Looking at some of these replays it makes you wonder if they can gain any technical insight if they had to, The cloud cover makes it very hard to see the Shuttle at times.
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
And I'm glad they don't!
)
. Third consecutive on time launch ! STS-129, 132 and 135 !
