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#20
by
Ronsmytheiii
on 14 May, 2009 11:30
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Crew welcoming us aboard! Middeck facing airlock, Pilot Gregg Johnson and behind Mike Massimino
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#21
by
LostInSpace
on 14 May, 2009 11:31
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As I understand it the reduced cabin environment is the first step. The EVA team will pre-breath pure oxygen while in the airlock to purge remaining nitrogen. (i'm no expert on these matters so anybody chip in with corrections).
Right, they would be in "continuous campout" in ISS EVA prep terminology, since the crew module pressure was lowered to 10.2 psi on Flight Day 2. But shuttle crews have been doing this for 25 years; the ISS campout is something like a modified protocol. Depress to 10.2 is standard for all standalone shuttle flights with EVAs -- and a modified version was done for ISS assembly missions with EVAs from the shuttle airlock.
(If you listen to the air-to-ground, I believe the '10.2 servicing' or '10.2 maintenance' calls are during the post-sleep period.)
Campout is the term for isolating the EVA crew at a reduced pressure from the rest of ISS. Can't bring the entire ISS down to 10.2 psia like we can on shuttle.
If an EVA crew is subjected to 10.2 psia for 24 hours prior to an EVA, they will still be required to be buttoned up in their suit on 100% O2 for ~40 minutes before depress (if I recall correctly) 12 hours at 10.2 = 75 minutes prebreathe. If the cabin is at 14.7 psi, the prebreathe time in the suit is a whopping 4 hours. They're also advised to move around a bit in the suit to work the remaining nitrogen out their joints.
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#22
by
Ronsmytheiii
on 14 May, 2009 11:33
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Talking about Imax on EVA
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#23
by
Ronsmytheiii
on 14 May, 2009 11:35
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#24
by
Ronsmytheiii
on 14 May, 2009 11:35
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#25
by
Ronsmytheiii
on 14 May, 2009 11:40
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EMU purge, then crew will go to prebreathe lasting 40 minutes
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#26
by
Ronsmytheiii
on 14 May, 2009 11:45
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Going into free drift
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#27
by
Ronsmytheiii
on 14 May, 2009 11:45
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#28
by
Ronsmytheiii
on 14 May, 2009 11:47
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ready for pivot ops, to allow for instillation of the BAPS
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#29
by
refsmmat
on 14 May, 2009 11:49
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If that's the middeck, it looks awfully crowded for a flight with an external airlock. Are some of those boxes for emergency rations, O2 and LiOH?
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#30
by
Ronsmytheiii
on 14 May, 2009 11:49
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#31
by
Ronsmytheiii
on 14 May, 2009 11:51
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#32
by
Ronsmytheiii
on 14 May, 2009 11:52
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45 minutes from Depressurization of airlock
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#33
by
Ronsmytheiii
on 14 May, 2009 11:54
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#34
by
Ronsmytheiii
on 14 May, 2009 11:56
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EMU purge has stopped, now doing prebreathe
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#35
by
Ronsmytheiii
on 14 May, 2009 11:59
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Ready to move arm to pregrapple position
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#36
by
Ronsmytheiii
on 14 May, 2009 12:01
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moving to position to install MFR when the EVA begins, arm visible in the reflection off Hubble
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#37
by
Ronsmytheiii
on 14 May, 2009 12:10
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RMS in pregrapple position
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#38
by
Ronsmytheiii
on 14 May, 2009 12:18
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#39
by
Ronsmytheiii
on 14 May, 2009 12:21
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