STS 122, Colombus to the ISS |
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STS 122, Colombus to the ISS |
 Dec 9 2007, 12:04 PM
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#16
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 Merciless Robot  Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602  |
Yep.
This has gotta be a wiring problem; weird, intermittent sensor malfunctions almost invariably are. Thermal contraction at an interface point once the LH2 hits it? -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Dec 9 2007, 02:57 PM
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#17
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Junior Member Group: Members Posts: 45 Joined: 8-August 05 Member No.: 457 |
A preliminary launch date has now been set for 2 January, 2008.
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Dec 9 2007, 05:48 PM
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#18
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Good call. They've learned the lesson of Challenger well, then. I was more than a little concerned about the time pressure causing hasty decisions.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Dec 10 2007, 08:02 AM
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#19
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 Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
As a tech support rep for Comcast, I can tell these guys exactly how to fix their problem:
1) Unplug everything. 2) Leave everything unplugged for a good 30 seconds. 3) Plug everything back in, in sequence from upstream to downstream (in terms of signal flow). Works every time...  -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Dec 10 2007, 08:37 AM
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#20
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
It worked for our little network here at work - if I did it any other way, we wouldn't get gbit networking throughout.
Doug |
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Dec 11 2007, 01:27 PM
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#21
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Bloody cable & computer guys...
 Believe it or not, fuel quantity sensing systems are almost always the most difficult things to troubleshoot on aircraft. These level sensors probably aren't so bad, but I wish I knew their operating principle. AC-excited capacitive sensors are the worst by far; any little cable or shielding fault often screws things up royally or causes an endless series of intermittent, difficult-to-duplicate problems. I've been in situations where it was actually easier to rewire an entire tank then to spend time finding the actual fault. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Dec 11 2007, 06:30 PM
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#22
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
The ECO sensors are indeed capacitance sensors. I don't have data at the moment as to whether or not they're AC-excited, but they're definitely capacitance sensors.
-the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Dec 11 2007, 08:00 PM
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#23
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Oh, lovely (not)...
 Hopefully, then, they're DC-excited; these are much easier systems to troubleshoot since the cable shielding isn't part of the overall signal path. Given the age of the Shuttle, though, I suspect that they're AC after all.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Dec 11 2007, 10:21 PM
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#24
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 Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Dec 11 2007, 10:42 PM
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#25
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 Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
zOMG, look how many strap-on boosters that thing has!!11
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Dec 11 2007, 10:47 PM
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#26
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 The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Now that's what I call a serious software bug problem...
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Dec 12 2007, 07:58 AM
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#27
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 Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Tintin get the same trouble once, but it was on "L'étoile mystérieuse" not "Objectif Lune"...
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 Dec 12 2007, 11:10 AM
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#28
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 Member Group: Members Posts: 276 Joined: 11-December 07 From: Dar es Salaam, Tanzania Member No.: 3978 |
Hi, im new here. Just joined yesterday. Its hard to get connected to the rest of the world when yer in the middle of Africa.....Tanzania, Dar es Salaam to be precise. Any way im sure all of of us hav one thing in common.....the postponed launch of STS-122. I mean c'mon, i'v watched most of the shuttle launches since "Discovery's Return to Flight" mission but this has got to be one of the most frustrating missions i hav ever had the pleasure to witness.
Anyway, safety coms first i suppose. I didnt notice that spider picture posted by lyford! It kind of reminds me of Tintin in "The Shooting Star". Here's to a succesful launch on 2nd January. -------------------- |
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Dec 12 2007, 03:50 PM
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#29
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 Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
QUOTE (Doc @ Dec 12 2007, 06:10 AM)  ...this has got to be one of the most frustrating missions i have ever had the pleasure to witness. Ironically it looked like one of the smoothest up to the point where the current problem occurred. Having lived a two hour drive from The Cape the entire life of the Shuttle program, this was going to be the first time I made the drive to see a launch. All the stars were in alignment: Beautiful weather, no serious problems being worked, wife and I both finagled time off from work.... Oh, well. |
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Dec 12 2007, 06:22 PM
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#30
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 Member Group: Members Posts: 408 Joined: 3-August 05 Member No.: 453 |
All kinds of ECO sensor info (but no sensor AC/DC info) at:
http://www.nasa.gov/returntoflight/news/ECO_graphics.html Airbag |
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