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#620
by
mkirk
on 18 Feb, 2008 21:49
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Jim - 18/2/2008 3:28 PM
Then my memory is failing me. Was there a Spartan or another RMS deployed payload that used a PGSC for commanding before release?
I am a little weak in my Payload OPS knowledge but I wasn't trying to imply that the PGSCs are not part of the OBSS/LDRI ops. I was just trying to respond to one of the previous posts concerning the pushbuttons in the procedure they quoted. My real point was, that the panel in question (A7U) doesn't have extra/new buttons - as far as I know - but rather the existing buttons have been given additional functions.
Mark Kirkman
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#621
by
brahmanknight
on 18 Feb, 2008 22:56
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Can someone explain this quote from an article presently on Space Review.
"With 121 flights to date and only 5 mission failures, the Shuttle has a mission success reliability of almost 96%—two-thirds better than the overall average."
What are the other 3 failures?
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#622
by
psloss
on 18 Feb, 2008 23:04
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brahmanknight - 18/2/2008 6:56 PM
Can someone explain this quote from an article presently on Space Review.
"With 121 flights to date and only 5 mission failures, the Shuttle has a mission success reliability of almost 96%—two-thirds better than the overall average."
What are the other 3 failures?
I'm guessing that they define
mission failures as minimum duration flights:
http://www.cbsnews.com/network/news/space/spacestats.html#MINIMUM
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#623
by
Danny Dot
on 18 Feb, 2008 23:40
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kneecaps - 18/2/2008 3:56 PM
mkirk - 18/2/2008 8:30 PM
There are several cases in which a button or light serves alternate purposes. A couple that immediately come to mind are the Body Flap light which extinguishes in the post meco timeframe to indicate completion of the MPS DUMP or the use of the SRB SEP or ET SEP push buttons to set the weight on wheels desicretes after landing.
Mark Kirkman
Great examples! I believe the speedbrake/thottle push button also arm/disarms PCT after capture?
Pete
PCT?
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#624
by
Jorge
on 19 Feb, 2008 00:16
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Danny Dot - 18/2/2008 6:40 PM
kneecaps - 18/2/2008 3:56 PM
mkirk - 18/2/2008 8:30 PM
There are several cases in which a button or light serves alternate purposes. A couple that immediately come to mind are the Body Flap light which extinguishes in the post meco timeframe to indicate completion of the MPS DUMP or the use of the SRB SEP or ET SEP push buttons to set the weight on wheels desicretes after landing.
Mark Kirkman
Great examples! I believe the speedbrake/thottle push button also arm/disarms PCT after capture?
Pete
PCT?
Post Contact Thrusting, an open-loop sequence of -Z RCS thruster firings initiated by the CDR at contact or range=2 inches, whichever comes first (DON'T initiate it "after capture" - you'll break the docking mechanism...).
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#625
by
Danny Dot
on 19 Feb, 2008 02:16
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Jorge - 18/2/2008 7:16 PM
Danny Dot - 18/2/2008 6:40 PM
kneecaps - 18/2/2008 3:56 PM
mkirk - 18/2/2008 8:30 PM
There are several cases in which a button or light serves alternate purposes. A couple that immediately come to mind are the Body Flap light which extinguishes in the post meco timeframe to indicate completion of the MPS DUMP or the use of the SRB SEP or ET SEP push buttons to set the weight on wheels desicretes after landing.
Mark Kirkman
Great examples! I believe the speedbrake/thottle push button also arm/disarms PCT after capture?
Pete
PCT?
Post Contact Thrusting, an open-loop sequence of -Z RCS thruster firings initiated by the CDR at contact or range=2 inches, whichever comes first (DON'T initiate it "after capture" - you'll break the docking mechanism...).
Thanks. I don't see why the speedbrake/throttle button would be used. It is in the front of the cockpit and the flying during this phase is done from the aft station.
Danny Deger
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#626
by
Aviator
on 19 Feb, 2008 03:02
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Hi All
Long time listener, first time caller.......
Assuming that Orbit/PLS are favorable, Whats the minimum amount of time needed to get off the ISS and to the ground??
( non-emergency, I'm not proposing a scenario of pyro-sep of the docking ring or anything like that)
I've always wondered why they took two days after undock to get to the ground. I mean thing like cabin prep and stow could be done while docked (hatch was closed for better than 14 hours prior to sep). Seems to me like you could just depart the station, do a small departure burn, and then at a safe distance from the ISS, do the deorbit burn and be on the ground an hour later??
Thanks
Larry
(really wanted to be an Apollo astronaut but NASA said they had all of the nine year old astronauts they needed....Bummer)
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#627
by
tmckinley
on 19 Feb, 2008 03:55
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After undocking the shuttle does a flyaround of the station. The crew also takes time to reinspect the the wing-leading edges for damage. Stowage takes a lot of time, there is also time needed to test the RCS and other systems needed for deorbit and landing. I'm sure that there's a lot more involved as well. I think I've heard that in an emergency the shuttle could be down in a few hours.
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#628
by
Jorge
on 19 Feb, 2008 04:05
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Danny Dot - 18/2/2008 9:16 PM
Jorge - 18/2/2008 7:16 PM
Danny Dot - 18/2/2008 6:40 PM
kneecaps - 18/2/2008 3:56 PM
mkirk - 18/2/2008 8:30 PM
There are several cases in which a button or light serves alternate purposes. A couple that immediately come to mind are the Body Flap light which extinguishes in the post meco timeframe to indicate completion of the MPS DUMP or the use of the SRB SEP or ET SEP push buttons to set the weight on wheels desicretes after landing.
Mark Kirkman
Great examples! I believe the speedbrake/thottle push button also arm/disarms PCT after capture?
Pete
PCT?
Post Contact Thrusting, an open-loop sequence of -Z RCS thruster firings initiated by the CDR at contact or range=2 inches, whichever comes first (DON'T initiate it "after capture" - you'll break the docking mechanism...).
Thanks. I don't see why the speedbrake/throttle button would be used. It is in the front of the cockpit and the flying during this phase is done from the aft station.
It is used because it is a pushbutton that doesn't already have a function in OPS 2, so it was available.
And it is only used to arm/disarm. That is not part of the flying task. The actual firing of PCT is done using the SPARE (unlabeled) DAP pbi on the aft panel, so the CDR can reach it easily while flying from the aft station.
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#629
by
Oli4
on 19 Feb, 2008 11:41
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Hi guys... Since yesterday the Shuttle is 'flying' sideways. Why is that?
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#630
by
psloss
on 19 Feb, 2008 11:50
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#631
by
Oli4
on 19 Feb, 2008 11:54
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O yeah I read that. THX psloss!!!!
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#632
by
dpap
on 19 Feb, 2008 12:11
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Does anyone knows what are those large eliptical/circular lines i see on the shuttle/ISS ground track? It usually has two of them, one blue covering the Americas and one green covering Europe/Africe. Together, they cover about 2/3 of the earth.
Sometimes there is also another yellow line that covers the rest 1/3 of the earth mostly from Asia to central Pacific.
My guess is that it has to do with communications. Maybe it's some comm's sattelites footprint or something like that but does anyone really knows what are they? (S-band comms? Ku-band data? Is it a sattelite's footprint, a ground station, or it originates from the shuttle?)
There are also quite few smaller circles/footprints all over russia with acronyms i've never heard about them. Are those sattelite footprints too or ground radar stations?
Recently, during a shuttle re-entry, i've notice one of the two big footprints (it was the one that covers the Americas) started to get smaller and smaller as the shuttle was entering lower altitudes. Unfortunately, the ground track then switched to a more detailed view, showing the continental US as the shuttle was approaching it's landing site and the familiar 'global' ground track was out of view.
There is also a not-so-circular-or-eliptical shape line near South America/Atlantic named 'SAA'. I guess it stands for 'South Atlantic Anomaly' - the geomagnetic phonomenon where the inner van Allen radiation belt makes its closest approach to the planet's surface, right?
Finnaly, a trivia question ... does anyone have a clue why the ground track shown in mission control goes 'blue' during the last couple of flight days before the shuttle's re-entry?
Thanks,
-- dimitris
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#633
by
Lawntonlookirs
on 19 Feb, 2008 12:23
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I have a question on the morning and daily reports that I was unable to find an answer for. What do the mean when they have a listing under "Funnies"? I no that they are not humorous, but would expect that they are something odd that has happened.
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#634
by
Jim
on 19 Feb, 2008 12:32
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dpap - 19/2/2008 8:11 AM
1. My guess is that it has to do with communications. Maybe it's some comm's sattelites footprint or something like that but does anyone really knows what are they? (S-band comms? Ku-band data? Is it a sattelite's footprint, a ground station, or it originates from the shuttle?)
2..There are also quite few smaller circles/footprints all over russia with acronyms i've never heard about them. Are those sattelite footprints too or ground radar stations?
3..There is also a not-so-circular-or-eliptical shape line near South America/Atlantic named 'SAA'. I guess it stands for 'South Atlantic Anomaly' - the geomagnetic phonomenon where the inner van Allen radiation belt makes its closest approach to the planet's surface, right?
1. They show coverage for the 2 prime TDRSS spacecraft. The eliptical/circular lines designate where the spacecraft can't "see"
2. they are russian ground stations
3. yes
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#635
by
Lawntonlookirs
on 19 Feb, 2008 14:51
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Thanks Gary. I thought that was what it was after I thought about it awile.
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#636
by
clay247
on 19 Feb, 2008 19:58
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At this phase of the mission, shuttle has undocked from station, do shuttle and ISS appear to share a flight path because they are still very close together? I'm interested in any information about what determines the flight path.
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#637
by
nathan.moeller
on 19 Feb, 2008 20:03
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clay247 - 19/2/2008 2:58 PM
At this phase of the mission, shuttle has undocked from station, do shuttle and ISS appear to share a flight path because they are still very close together? I'm interested in any information about what determines the flight path.
Yes. If you're viewing the pair from the ground, ISS will appear first, roughly a minute or so ahead of the orbiter. The orbiter will trail ISS but follows the same flight path as the two traverse the sky.
The two share a flight path from the time the orbiter launches from Florida to the time it encounters the atmosphere for re-entry, as they are in the same orbit (51.6 degrees).
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#638
by
janmb
on 20 Feb, 2008 06:56
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psloss - 11/2/2008 3:01 AM
SpikeSpiegel - 11/2/2008 4:55 PM
Since the OBSS has to be left on the ISS after Atlantis undocks, has it been modified to receive power from the SSRM? I remember from STS-120 that there was some discussion about looseing heaters after the OBSS was handed off from the shuttle arm to the SSRM.
This unit won't be left on the station; the one on the next flight (ISS-1J/A, STS-123, orbiter Endeavour) will be.
Edit -- don't know if Chris has written an article on this yet.
I would assume it will need power when stowed between STS-123 and 124. Power (and what it all boils down to - temparature management) has been a big deal before during simple overnight positions and hand-overs so it seems it has a very limited lifespan while unpowered, like most things up really.
More and more info is propping up for STS-123 so it's probably already been outlined somewhere, but I'm sure someone has more accurate info on the plans for this.
It may be as simple as leaving it grappled by the SSRMS unless there are other robotics planned for the stage between 123 and 124
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#639
by
rocketguy101
on 20 Feb, 2008 11:27
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What is the moving line (running from lower left to upper right) on this display? You can see it move in the pair of images.