Quote from: ChrisGebhardt on 11/09/2010 03:55 pmQuote from: robertross on 11/09/2010 03:18 pmQuote from: Commander Keen on 11/09/2010 03:12 pmAny update on whether the foam crack occurred during tanking or when it was draining (and warming up)? It is a scary thought to have launched with such a condition. I was thinking if the bond was weak to begin with. Just thankful it was caught when you want it to be, BEFORE A LAUNCH! Great work.Well, considering they now do adhesion pull tests in the intertank region, a procedure they nailed down quite well due to issues seen with the placement staging, they knew the foam was good to go.Actually, if I'm reading the L2 presentation on this correctly, this region of the tank is out of reach by personnel during bond adhesion testing. So, no, the pull tests would not have verified anything on this particular region of the tank.No, that was for 'current' access concerns. The tank would have bond adhesion tests performed around the full circumference, if required, but (I'd say, not sure the exact circumference covered) the ~180deg clocking on the orbiter side would be the most critical (plus a bit more obviously).edit to add: bumped the relavent ET document on L2 for you
Quote from: robertross on 11/09/2010 03:18 pmQuote from: Commander Keen on 11/09/2010 03:12 pmAny update on whether the foam crack occurred during tanking or when it was draining (and warming up)? It is a scary thought to have launched with such a condition. I was thinking if the bond was weak to begin with. Just thankful it was caught when you want it to be, BEFORE A LAUNCH! Great work.Well, considering they now do adhesion pull tests in the intertank region, a procedure they nailed down quite well due to issues seen with the placement staging, they knew the foam was good to go.Actually, if I'm reading the L2 presentation on this correctly, this region of the tank is out of reach by personnel during bond adhesion testing. So, no, the pull tests would not have verified anything on this particular region of the tank.
Quote from: Commander Keen on 11/09/2010 03:12 pmAny update on whether the foam crack occurred during tanking or when it was draining (and warming up)? It is a scary thought to have launched with such a condition. I was thinking if the bond was weak to begin with. Just thankful it was caught when you want it to be, BEFORE A LAUNCH! Great work.Well, considering they now do adhesion pull tests in the intertank region, a procedure they nailed down quite well due to issues seen with the placement staging, they knew the foam was good to go.
Any update on whether the foam crack occurred during tanking or when it was draining (and warming up)? It is a scary thought to have launched with such a condition. I was thinking if the bond was weak to begin with. Just thankful it was caught when you want it to be, BEFORE A LAUNCH! Great work.
When/where is the Bond Adhesion check normally done?
New thread for Discovery's troubleshooting, leading with a large GUCP article that I've collated over the past two days.Covers STS-119 and STS-127's GUCP scrubs, internal notes at the time and investigation and PRCB content from L2 presentations and coverage. It's a long one, but I think it will be the most comphensive out there.STS-133 GUCP root cause to benefit from STS-119/127 investigation:http://www.nasaspaceflight.com/2010/11/sts-133-gucp-benefit-sts-119127-investigation/-----L2 Members:http://forum.nasaspaceflight.com/index.php?action=tags&tags=GUCP
Either the tolerances are really tight or it was overlooked-I don't get how it (GUCP) could be mis-aligned
Also, I think there's all manner of thermal conditions going on. I remember they put strain gauges on the feet of the GUCP dueing the STS-127 tanking test to get data on that.
Quote from: robertross on 11/09/2010 04:25 pmedit to add: bumped the relavent ET document on L2 for youCopying this one quote across from L2 from AnalogMan: "The flange [where the cracks are] is about 3ft above the highest foam pull-test plug location."That presentation on L2 about the crack generally talks about current access, but the slide I'm talking about is page 17 (and is, I believe, an image from inside the VAB). However, I might also be misunderstanding "Bond Adhesion Testing." Is this the technical term for Plug-pull tests?
edit to add: bumped the relavent ET document on L2 for you
They'll likely have the seal out by the morning. Thanks Roger!
Yes, that's the idea Rather than putting on an article tonight (and I could have), I want to wait until the morning in case we have some initial updates, so as not to miss any potentially important updates from overnight.