avi
Posts: 900
Joined: Sat Sep 15, 2001 1:27 am

A Spacewalk Question

Mon Apr 07, 2008 2:47 pm

I know that a spacewalk begins when the astronauts switch their spacesuit power to battery (when the hatch to the vacuum of space is already open) and ends when they start to pressurize the airlock.

My question is: if a spacewalk takes place 7 hours for example, how long are the astronauts "sealed" inside their spacesuit?
In other words, who much time do they spend inside their spacesuit from helmet ON to helmet OFF (under the assumption the helmet is the last item of the suit to come on and the first to come off)?

Thanks
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chksix
Posts: 336
Joined: Mon Sep 26, 2005 6:16 pm

RE: A Spacewalk Question

Mon Apr 07, 2008 4:39 pm

From what I've seen on NASA tv it looks like at least 2 hr's extra in the EMU while the checks are done until they can open the hatch.

Actually I think the EVA clocks stops also when the suit is reconnected to the ISS power bus.

Over at: http://forum.nasaspaceflight.com/ you can find detailed EVA timelines if you look in threads about previous flights.

Here's an example in this post:
http://forum.nasaspaceflight.com/for...ew.asp?tid=12266&posts=291&start=1

[Edited 2008-04-07 09:45:27]
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avi
Posts: 900
Joined: Sat Sep 15, 2001 1:27 am

RE: A Spacewalk Question

Mon Apr 07, 2008 7:07 pm



Quoting Chksix (Reply 1):
From what I've seen on NASA tv it looks like at least 2 hr's extra in the EMU while the checks are done until they can open the hatch.

I watch NASA TV too but I'm locking for more accurate number before and after the spacewalk.

Quoting Chksix (Reply 1):
Actually I think the EVA clocks stops also when the suit is reconnected to the ISS power bus.

I thought that way too until I heard otherwise on NASA TV.

Thanks, I will check the links you gave me.
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