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#2080
by
wolfpack
on 26 Jul, 2011 13:23
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Looking at the post-landing convoy photos, I've always wondered what are the trucks tailing the orbiter doing? They have those long hoses attached to the sides, I think three red ones on one side and a white one on the other.
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#2081
by
brettreds2k
on 26 Jul, 2011 13:31
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
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#2082
by
Lee Jay
on 26 Jul, 2011 13:32
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#2083
by
Jim
on 26 Jul, 2011 14:01
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
Not power. Purge and cooling.
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#2084
by
wolfpack
on 26 Jul, 2011 14:06
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
Not power. Purge and cooling.
Makes sense. I keep forgetting that Shuttle is chock full of 70's era solid state electronics - it's a water heater!
Why does the orbiter need to stay powered up all the way back to the OPF? Because it still contains APU and RCS fuels? Does someone actually sit on the flight deck during the towback?
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#2085
by
Lee Jay
on 26 Jul, 2011 14:16
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
Not power. Purge and cooling.
That's what I thought too, but that link I posted had this:
"We have to hook up within 30 minutes. It's very important to maintain cooling, maintain power in the orbiter,"
To what was he referring?
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#2086
by
psloss
on 26 Jul, 2011 14:22
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
Not power. Purge and cooling.
That's what I thought too, but that link I posted had this:
"We have to hook up within 30 minutes. It's very important to maintain cooling, maintain power in the orbiter,"
To what was he referring?
Probably that if sufficient cooling can't be maintained, you have to start turning more and more things off prematurely.
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#2087
by
JayP
on 26 Jul, 2011 14:23
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Makes sense. I keep forgetting that Shuttle is chock full of 70's era solid state electronics - it's a water heater!
Why does the orbiter need to stay powered up all the way back to the OPF? Because it still contains APU and RCS fuels? Does someone actually sit on the flight deck during the towback?
Yes, there a couple of people in the cabin all the way back. After the 135 landing last week, they left Atlantis parked outside the OPF for a few hours while they had the employee and press event. The airstair truck was parked off to the side and the hatch was secured. You could see the people inside thru the cockpit windows. We were chuckling about it wondering who they got to volunter for that duty.
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#2088
by
Jim
on 26 Jul, 2011 15:03
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
Not power. Purge and cooling.
That's what I thought too, but that link I posted had this:
"We have to hook up within 30 minutes. It's very important to maintain cooling, maintain power in the orbiter,"
To what was he referring?
The fuel cells are supplying power and producing heat. If the heat cant be removed, then the fuel cells would have to shut down.
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#2089
by
Jim
on 26 Jul, 2011 15:04
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I think one gives the orbiter power, one cools the inside and one I think purges the vapors.
Not power. Purge and cooling.
Makes sense. I keep forgetting that Shuttle is chock full of 70's era solid state electronics - it's a water heater!
Why does the orbiter need to stay powered up all the way back to the OPF? Because it still contains APU and RCS fuels? Does someone actually sit on the flight deck during the towback?
To monitor systems
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#2090
by
Lee Jay
on 26 Jul, 2011 15:08
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The fuel cells are supplying power and producing heat. If the heat cant be removed, then the fuel cells would have to shut down.
Okay, so they're not actually supplying power, they're just allowing the orbiter to continue to supply its own power. That statement just confused me. Thanks for clearing that up.
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#2091
by
Zoe
on 26 Jul, 2011 22:15
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On STS-135 there was a hold at T-31 seconds. After verifying that the GVA had retracted SPE was GO and it sounded like the NTD was about to tell CGLS to pick up the count when SPE said they needed concurrence with CGLS and ASP to clear the hold. Considering SPE and LD were both GO at this time, why was there this additional delay? I'm sure there wasa a very good reason but had there been less LOX drainback hold time then it could have resulted in a scrub.
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#2092
by
psloss
on 26 Jul, 2011 22:30
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On STS-135 there was a hold at T-31 seconds. After verifying that the GVA had retracted SPE was GO and it sounded like the NTD was about to tell CGLS to pick up the count when SPE said they needed concurrence with CGLS and ASP to clear the hold. Considering SPE and LD were both GO at this time, why was there this additional delay? I'm sure there wasa a very good reason but had there been less LOX drainback hold time then it could have resulted in a scrub.
jcopella elaborated on launch day:
http://forum.nasaspaceflight.com/index.php?topic=25871.msg769415#msg769415(It wasn't 'ASP', I'll have to go back and get the exact words, but I think that was 'mask'.)
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#2093
by
10W29
on 26 Jul, 2011 23:34
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Yes, there a couple of people in the cabin all the way back. After the 135 landing last week, they left Atlantis parked outside the OPF for a few hours while they had the employee and press event. The airstair truck was parked off to the side and the hatch was secured. You could see the people inside thru the cockpit windows. We were chuckling about it wondering who they got to volunter for that duty.
One of the personnel inside also performed the same duty on STS-1.
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#2094
by
Mark Dave
on 27 Jul, 2011 14:40
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There was a video of Atlantis post landing from STS-132 that showed what goes on after the crew leave. I can't find the video though. It showed the ground crew in the cabin checking the flight computers, etc. The hatch being shut prior to tow back and opened once near the OPF.
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#2095
by
penguin44
on 27 Jul, 2011 21:12
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Regarding the shuttle airlock prior to iss. Did the astronauts need to prebreathe for Eva as well?
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#2096
by
JayP
on 27 Jul, 2011 21:17
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Regarding the shuttle airlock prior to iss. Did the astronauts need to prebreathe for Eva as well?
Yes, Anytime you drop from 14.7 psi O2/N2 directly to 4 psi 100% O2 you are going to need to scrub the nitrogen from your blood stream first or else you'll get the bends.
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#2097
by
penguin44
on 27 Jul, 2011 22:11
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Great thanks for the answer!
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#2098
by
Zamzara
on 29 Jul, 2011 17:40
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Hi, sorry if this has been answered but I could not find it in a search:
What do the colours mean in contingency abort modes? E.g. "two out blue"?
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#2099
by
TJL
on 30 Jul, 2011 04:11
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I remember reading a while back that Dick Scobee was part of the crew that flew the 747 / Enterprise from the Paris Air Show back to the United States.
Can anyone here confirm that?
Thank you.
