STS-121: Launch target May, 2006 - Griffin

[SpaceKiwi]

Actually, now that I think about what you said, did you mean that 3 of 4 was the LCC requirement prior to Challenger, <b>however</b> in practice you never launched with 3 of 4 even though it was technically within the rules to do so if you had wanted? <div class="Discussion_UserSignature"> <p><em><font size="2" color="#ff0000">Who is this superhero?  Henry, the mild-mannered janitor ... could be!</font></em></p><p><em><font size="2">-------------------------------------------------------------------------------------------</font></em></p><p><font size="5">Bring Back The Black!</font></p> </div>

 

[SpaceKiwi]

Yeah, that was my feeling as well, Rybanis. The coincidence almost makes it feel like a 'bad batch' of parts. However, if I remember correctly, I think the ECO sensors are hand-built to order? And, they tested the begezus out of the componentry when the problem manifested itself last time. Didn't it end up as a UA in the final wash-up? <div class="Discussion_UserSignature"> <p><em><font size="2" color="#ff0000">Who is this superhero?  Henry, the mild-mannered janitor ... could be!</font></em></p><p><em><font size="2">-------------------------------------------------------------------------------------------</font></em></p><p><font size="5">Bring Back The Black!</font></p> </div>

 

[SpaceKiwi]

<blockquote><font class="small">In reply to:</font><hr /><p>Yes, I guess I do not communicate very well. That is what I thought I said.<p><hr /></p></p></blockquote><br />No, you're fine SG. As usual, I didn't fully engage thought-processes before keyboard again. I jumped straight to the conclusion from your earlier statement that, because a 3 of 4 launch <b>COULD</b> occur under the rules pre-Challenger, that one or several <b>HAD</b> in fact occured pre-Challenger.<br /><br />This would be further evidence of why you're a Silver Snoopy recipient and work on the US Space Program, and I ... uh ... don't.<br /><br /><img src="/images/icons/smile.gif" /> <div class="Discussion_UserSignature"> <p><em><font size="2" color="#ff0000">Who is this superhero?  Henry, the mild-mannered janitor ... could be!</font></em></p><p><em><font size="2">-------------------------------------------------------------------------------------------</font></em></p><p><font size="5">Bring Back The Black!</font></p> </div>

 

[llivinglarge]

Who manufactures these sensors?

 

[llivinglarge]

LOL. I'd like to see the FCC registration...

 

[jamie_young]

Another problem with ET-119, though less serious than the ECO sensors, plus some other stuff like the latest manifest and RMS damage updates.<br /><br />http://www.nasaspaceflight.com/content/?id=4362

 

[llivinglarge]

BTW, what do these troublesome sensors look like?

 

[bpcooper]

Like this:<br /><br />http://www.spaceflightnow.com/shuttle/sts114/050716ecographic/ <div class="Discussion_UserSignature"> <p>-Ben</p> </div>

 

[montmein69]

Does the resistance change in relation with the temperature ? Or does the sensor use the difference in capacitance between liquid hydrogen and gazeous hydrogen ? <div class="Discussion_UserSignature"> </div>

 

[llivinglarge]

It really is pathetic how such a simple mechanism takes all this effort and time to replace.

 

[llivinglarge]

The paranoia at NASA is really killing me... Why can't we have safety and productivity at the same time? What ever happened to the concept of multiple launches with "2 upright, 2 sleep tight"?<br /><br />I say go with 3 and disable the faulty one, it obviously hates Discovery... If worst comes to worst, we have pad aborts and intact aborts.<br /><br />If the sensor failed, would we have a scenario akin to STS-51-F or would we be looking at something on a totally different scale?<br /><br />(BTW, I still can't visualize the manuevers for RTLS)

 

[llivinglarge]

"How close are they with having enough confidence in the radars detecting foam loss, to go with that, and drop the daylight restriction?"<br /><br />[sarcasm]As soon as we paint the orbiters bright orange or green, we should be fine.[/sarcasm]<br /><br />But seriously, the foam could always use another layer of radar amplifying material.

 

[llivinglarge]

2 orbiters on the pads, 2 getting ready.

 

[strandedonearth]

Thanks for all the interesting info, SG

 

[radarredux]

> <i><font color="yellow">The decision was to replace all 4 sensors low level sensors. A new launch target will be released in about 2 weeks, however it will be NET July.</font>/i><br /><br />I am actually relieved, despite the obvious frustrations of additional delays and costs. I think it would be worse to put the Shuttle on the launch pad, ready to go, crew on board, with all the eyes on this launch, and then scrub and return to the hanger.</i>

 

[kane007]

Nasawatch<br /><br />Launch rescheduled to 1 -19 July!

 

[llivinglarge]

When you say replace, do you mean a quick swap from the already-used spares on a warehouse shelf?

 

[jamie_young]

Moving to July's been on serveral nasaspaceflight.com articles over the past week. It was just made official today. The latest article shows how much of a process they have to do now, with a climate control tent to be built around the bottom of the ET in the VAB:<br /><br />http://www.nasaspaceflight.com/content/?id=4373

 

[SpaceKiwi]

<blockquote><font class="small">In reply to:</font><hr /><p>The decision was to replace all 4 sensors low level sensors. A new launch target will be released in about 2 weeks, however it will be NET July.<p><hr /></p></p></blockquote><br />SG, is it possible to/do they test the sensors at Michoud while the ET is under construction, or do they wait until ET arrival at KSC? <div class="Discussion_UserSignature"> <p><em><font size="2" color="#ff0000">Who is this superhero?  Henry, the mild-mannered janitor ... could be!</font></em></p><p><em><font size="2">-------------------------------------------------------------------------------------------</font></em></p><p><font size="5">Bring Back The Black!</font></p> </div>

 

[llivinglarge]

Will Stennis need to do any testing?

 

[steve82]

Looks like they're going to be replacing one of the arm segments too, which will involve a lot of retest related to OBSS, among other things.

 

[llivinglarge]

"They have techs here now. They will install and checkout the new sensors."<br /><br />From Stennis?

 

[llivinglarge]

Bah, I got the two sites mixed up...<br /><br />I swear, the rocket scientists in Greenbelt have complete mind control over the residents of College Park and UMD campus.

 

[halman]

shuttle_guy,<br /><br />If everything goes well with STS-121, how soon would another launch be scheduled? Would the daylight requirement still be effect?<br /><br />I have been sulking for a while, and have not kept up on developments regarding the shuttle, until the lastest delay was announced. The news story in the New York Times indicated that an additional three launches might be attempted if STS-121 is relatively fault-free. <div class="Discussion_UserSignature"> The secret to peace of mind is a short attention span. </div>

 

[jschaef5]

Well I hope they can get off the ground in July then. Was hoping go down there in May. But it looks like once they get going they plan to be launching every few months so one of these times I will hopefully be able to get away from life and get down there for a launch. Best of luck on the repairs and for nothing else to pop up. <div class="Discussion_UserSignature"> </div>