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#40
by
Ronsmytheiii
on 14 May, 2009 12:27
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About 10 minutes left in prebreathe, close to depress
Not that much chatter
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#41
by
Ronsmytheiii
on 14 May, 2009 12:36
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HAtch is closed and locked, one minute left in prebreathe
Go for depress
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#42
by
mikes
on 14 May, 2009 12:36
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Air is 78% oxygen
Just a typo I'm sure, but for the record air is 78% nitrogen, 21% oxygen (1% argon + a few other bits and pieces)
When you lower the air pressure from 14.7 to 10.2, you lower the partial pressure of nitrogen in that air - it's still 78% N2
I believe they raise the O2 fraction to 30% (anyone got a reference?) to keep the ppO2 around 0.21 bar (3psi) which is healthier for a crew that is having to concentrate on complex tasks. That reduces the N2 to about 0.5 bar which further helps to purge body tissues.
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#43
by
Ronsmytheiii
on 14 May, 2009 12:41
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#44
by
Ronsmytheiii
on 14 May, 2009 12:42
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5 psi, valve is closed performing leak check
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#45
by
Ronsmytheiii
on 14 May, 2009 12:45
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#46
by
Ronsmytheiii
on 14 May, 2009 12:46
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3 PSI
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#47
by
Lawntonlookirs
on 14 May, 2009 12:47
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Air is 78% oxygen
Just a typo I'm sure, but for the record air is 78% nitrogen, 21% oxygen (1% argon + a few other bits and pieces)
When you lower the air pressure from 14.7 to 10.2, you lower the partial pressure of nitrogen in that air - it's still 78% N2
I believe they raise the O2 fraction to 30% (anyone got a reference?) to keep the ppO2 around 0.21 bar (3psi) which is healthier for a crew that is having to concentrate on complex tasks. That reduces the N2 to about 0.5 bar which further helps to purge body tissues.
With the pressure being at 10.2psi, would that be about the same pressure you would get at 10,000 ft?
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#48
by
Ronsmytheiii
on 14 May, 2009 12:47
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2 psi
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#49
by
Ronsmytheiii
on 14 May, 2009 12:48
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o.8 psi
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#50
by
Ronsmytheiii
on 14 May, 2009 12:49
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0.5 psi, checking hatch
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#51
by
Ronsmytheiii
on 14 May, 2009 12:50
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Verifying waist tethers are set ans safety tethers
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#52
by
Ronsmytheiii
on 14 May, 2009 12:51
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Hatch is open, depress valve closed
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#53
by
Ronsmytheiii
on 14 May, 2009 12:52
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power to batteries!
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#54
by
Ronsmytheiii
on 14 May, 2009 12:53
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EVA officially started!
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#55
by
Ronsmytheiii
on 14 May, 2009 12:54
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John's WVS not working
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#56
by
Ronsmytheiii
on 14 May, 2009 12:54
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John will be red, Drew will be all white
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#57
by
Maty
on 14 May, 2009 12:54
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7:52am CDT EVA start time
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#58
by
Ronsmytheiii
on 14 May, 2009 12:57
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Water on
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#59
by
Ronsmytheiii
on 14 May, 2009 12:58
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Good readings on the suits