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The Nightstar Zoo • View topic - Why STS-114 launch was scrubbed 7-13-2005

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PostPosted: Wed Jul 13, 2005 11:49 pm 
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"I am a machine. I am a weapon of war. I am a destroyer of life in the service of life, the sword and shield of my human creators." Bolo Invincibilus, Mark XXIII, Model B (Experimental) 0075-NKE "Nike".


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PostPosted: Thu Jul 14, 2005 12:11 am 


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PostPosted: Thu Jul 14, 2005 12:41 pm 
This article says that it was replaced on the discovery's module, but they didn't know for sure if the transistors were the problem or not. Hurrah for several news sources saying different things.


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PostPosted: Thu Jul 14, 2005 10:38 pm 
Unless of course it was.... a CONSPIRACY! 0X

Muhuhahahahahaha!


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PostPosted: Sat Jul 16, 2005 2:27 am 
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"Tests in the early days of the shuttle program indicated that such a condition could result in "serious, uncontained damage" to the propulsion system, Hale said."

In other words, the turbopumps, which burn hydrogen and oxygen in a gas turbine to spin fast enough to feed LH2 and LOX to the main engines, might go *BLAM*.

"Problems with the fuel-tank sensor system have bedeviled NASA for months: They first popped up while testing a different fuel tank back in April, but engineers could not reproduce the glitch or track down its source. Instead, they replaced components of the system with approved spares."

Right, the "approved spare" was the complete sensor control box from Endeavour. The only one of those boxes to not have the transistors on the simulation circuit card replaced. Why go to the effort to remove the box from another shuttle when they had other spares on a shelf? Or could it be that the entire "inventory" amounts to exactly three, all installed on the shuttles? The NASA guys in the briefing never said how many of the boxes they have. :P

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"I am a machine. I am a weapon of war. I am a destroyer of life in the service of life, the sword and shield of my human creators." Bolo Invincibilus, Mark XXIII, Model B (Experimental) 0075-NKE "Nike".


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PostPosted: Sat Jul 16, 2005 5:47 pm 
All the spares are probably the ones already installed on shuttles.

While having an entire shuttle's worth of spare parts on hand might be a good idea, someone, somewhere, would complain about the wasted money and spare parts would either have to be sold back or built into a working shuttle. This is the way both large businesses and governments work.


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PostPosted: Sun Jul 17, 2005 2:29 am 
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"I am a machine. I am a weapon of war. I am a destroyer of life in the service of life, the sword and shield of my human creators." Bolo Invincibilus, Mark XXIII, Model B (Experimental) 0075-NKE "Nike".


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PostPosted: Sun Jul 17, 2005 2:58 pm 
I wonder if some day the Smithsonian will try to refit Enterprise to flying condition. I know it was never intended for that, but it seems like the kind of thing they would do.


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PostPosted: Mon Jul 18, 2005 1:26 am 
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The Enterprise will never be fitted out for use. It was actually the second shuttle to begin construction, Columbia was started first.

Enterprise was used for several glide tests, launched from the back of the 747 shuttle transport aircraft, first with the tailcone then without. It was never fitted with real engines, just ballast to simulate their weight.

After the approach and landing tests were complete, it was subjected to an extensive series of vibration tests, so it has the equivalent of several launches worth of stress on the airframe.

Enterprise is also heavier than Columbia, so even if it could be completely refit for flight, it couldn't carry as much payload as Columbia, which was the heaviest of the operational shuttles.

Many parts have been scavenged from Enterprise over the years for the others, and some major components were taken to build Endeavour.

Enterprise was recently given a cosmetic restoration and put back on display at the Air and Space Museuem.

Even if the money was available to embark on a crash program to totally dismantle and rebuild Enterprise, including a bunch of updates to make it lighter, it wouldn't be worthwhile because the shuttles will be retired in 2010 after the International Space Station assembly is completed.

IIRC, that was looked at as a possibility after the loss of Challenger, but it was deemed easier and cheaper to build Endeavour using mostly new parts and a some of the "low mileage" bits from Enterprise that weren't possibly compromised in strength by the vibration tests.

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"I am a machine. I am a weapon of war. I am a destroyer of life in the service of life, the sword and shield of my human creators." Bolo Invincibilus, Mark XXIII, Model B (Experimental) 0075-NKE "Nike".


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PostPosted: Mon Jul 18, 2005 3:23 pm 


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PostPosted: Wed Aug 17, 2005 8:52 pm 


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PostPosted: Thu Aug 18, 2005 12:27 am 


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PostPosted: Thu Aug 18, 2005 11:26 pm 


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