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#160
by
generic_handle_42
on 12 May, 2009 19:46
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#161
by
generic_handle_42
on 12 May, 2009 19:48
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#162
by
MarsMethanogen
on 12 May, 2009 19:48
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Larger ports and smaller ports are BOTH part of the RCS? I did not know that, if that's the case.
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#163
by
generic_handle_42
on 12 May, 2009 19:50
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#164
by
Herb Schaltegger
on 12 May, 2009 19:50
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Larger ports and smaller ports are BOTH part of the RCS? I did not know that, if that's the case.
Yes, they are.
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#165
by
generic_handle_42
on 12 May, 2009 19:52
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#166
by
MarsMethanogen
on 12 May, 2009 19:52
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#167
by
generic_handle_42
on 12 May, 2009 19:54
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Cabin depressurization to 10.2 psi has been completed. Will remain that way until after all EVAs are complete.
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#168
by
MarsMethanogen
on 12 May, 2009 19:57
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It was just mentioned that there has been a depress to 10.2 psi, the goal being to assist in the dissolved N2 purge in the spacewalker's blood. I'm aware of the need for this and the overnight "camp-outs" of EVA personnel the night prior to EVA ops, but is this depress normal for all EVA missions, or is it being done special for this mission? Does this activity serve to reduce at all the time duration of the night-before-EVA campout?
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#169
by
Retired Downrange
on 12 May, 2009 20:09
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....I'm aware of the need for this and the overnight "camp-outs" of EVA personnel the night prior to EVA ops, but is this depress normal for all EVA missions, or is it being done special for this mission? Does this activity serve to reduce at all the time duration of the night-before-EVA campout?
The "camp outs" are done on ISS....
There is no "crew lock" large enough for a comfortable "camp out" on the orbiter.
(I believe this is correct... If not, I'm sure we will be informed.)
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#170
by
DaveS
on 12 May, 2009 20:10
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There's no campouts for orbiter-based EVAs. Depressing the crew module is the only way to provide a N2 purge.
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#171
by
Jim
on 12 May, 2009 20:11
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It was just mentioned that there has been a depress to 10.2 psi, the goal being to assist in the dissolved N2 purge in the spacewalker's blood. I'm aware of the need for this and the overnight "camp-outs" of EVA personnel the night prior to EVA ops, but is this depress normal for all EVA missions, or is it being done special for this mission? Does this activity serve to reduce at all the time duration of the night-before-EVA campout?
It reduces the time of prebreath in the suit for the ISS and shuttle. The "campout" term only applies to the ISS where the only the 2 EVA'ers are "campingout" in the Quest module at a reduced pressure. The rest of the ISS is at sea level pressure. There is no way of isolating the EVA'ers on the shuttle, so the whole cabin and crew are "exposed" to the reduced pressure. This has been a normal practice of the shuttle since pre Challenger.
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#172
by
generic_handle_42
on 12 May, 2009 20:17
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Shot of an RCC panel on Atlantis
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#173
by
psloss
on 12 May, 2009 20:17
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It reduces the time of prebreath in the suit for the ISS and shuttle. The "campout" term only applies to the ISS where the only the 2 EVA'ers are "campingout" in the Quest module at a reduced pressure. The rest of the ISS is at sea level pressure. There is no way of isolating the EVA'ers on the shuttle, so the whole cabin and crew are "exposed" to the reduced pressure. This has been a normal practice of the shuttle since pre Challenger.
IIRC, the first EVA on STS-6 didn't do a depress, which meant the pre-breathe time was on the order of three hours or more. But that may have been the only one like that. Can't remember if the depress to 10.2 was there by the time of STS-41B or not, but wouldn't be surprised.
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#174
by
generic_handle_42
on 12 May, 2009 20:22
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Atlantis currently passing about 180 miles over Florida.
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#175
by
generic_handle_42
on 12 May, 2009 20:30
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Some nice views of Atlantis from the OBSS.
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#176
by
generic_handle_42
on 12 May, 2009 20:31
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Prepping for the OMS pod and T-0 umbilical inspections
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#177
by
psloss
on 12 May, 2009 20:31
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IIRC, the first EVA on STS-6 didn't do a depress, which meant the pre-breathe time was on the order of three hours or more. But that may have been the only one like that. Can't remember if the depress to 10.2 was there by the time of STS-41B or not, but wouldn't be surprised.
Trivia update: didn't do depress on STS-6, did depress to 10.2 on STS-41B. Pre-breathe time at 1 atm was 3.5 hours; with the depress to 10.2 psi, pre-breathe time was reduced to 1 hour.
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#178
by
generic_handle_42
on 12 May, 2009 20:31
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#179
by
Chris Bergin
on 12 May, 2009 20:34
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Nothing obvious sticking out! (and they do tend to be obvious on the OMS Pods).