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Space Forum / Shuttle / October 2007SSME's
I know each SSME is refurbished post flight. Are they each test fired post refurbishment? If not how are they certified for flight? I know they have a great reliability record, but some certification process must exist? Thanks, now I will sign off post posting :-) Jim in Houston. Contrary to popular opinion RN does not mean Real Nerd! Teddy Roosevelt's mother said: "Fill what is empty, empty what is full, and scratch where it itches"  SignaturePosted via a free Usenet account from http://www.teranews.com >I know each SSME is refurbished post flight. Well, you 'know' incorrectly. D. SignatureTouch-twice life. Eat. Drink. Laugh. http://derekl1963.livejournal.com/ -Resolved: To be more temperate in my postings. Oct 5th, 2004 JDL >>I know each SSME is refurbished post flight. > > Well, you 'know' incorrectly. True. SSME's used to be pulled after each flight and torn down for inspection. That's not the case today. Many improvements have been made to the SSME's over the years, including new LOX and LH2 turbopumps. The safety and longevity of the turbopumps was a concern with early SSME's. Jeff Signature"When transportation is cheap, frequent, reliable, and flexible, everything else becomes easier." - Jon Goff >>>I know each SSME is refurbished post flight. >> [quoted text clipped - 4 lines] >the SSME's over the years, including new LOX and LH2 turbopumps. The safety >and longevity of the turbopumps was a concern with early SSME's. Yep. We finally got the damned things working great, and so of course, now we're throwing them away in three years. Sigh. Brian > Yep. We finally got the damned things working great, and so of course, > now we're throwing them away in three years. Sigh. That's because expendable liquid fueled stages are the future of NASA launch vehicles with Ares I and Ares V and the SSME is too expensive to throw away. Then again, if NASA were to design a reusable liquid fueled rocket stage, it still wouldn't be economical to do so since the predicted flight rate of Ares I and Ares V is surely too low to justify development costs, especially the way NASA is going about development of Ares I and Ares V. If Ares I and Ares V don't die with the next Administration, then I predict Ares will eat up so much funding in the decades to come that there won't be much left for even flags and footprints on the moon, let alone for NASA's envisioned lunar base. Jeff Signature"When transportation is cheap, frequent, reliable, and flexible, everything else becomes easier." - Jon Goff >>>I know each SSME is refurbished post flight. >> [quoted text clipped - 6 lines] > >Jeff I may have "known" incorrectly, but I got my information from a video aired on the processing of Discovery on NASA TV. They stated each SSME is removed and refurbished after each mission. I may be wrong, but if I am it is because the horse was talking out of the wrong side of it's mouth. But thanks for the information. Jim in Houston. Contrary to popular opinion RN does not mean Real Nerd! Teddy Roosevelt's mother said: "Fill what is empty, empty what is full, and scratch where it itches" SignaturePosted via a free Usenet account from http://www.teranews.com > I may have "known" incorrectly, but I got my information from a video > aired on the processing of Discovery on NASA TV. They stated each SSME > is removed and refurbished after each mission. Refurbishment used to mean a complete tear-down and boroscope of all parts. Now it means a lot less work. I think they're certified for either 3-5 firings at this point. (And that may have gone up and is at this point probably still a bit conservative.) At this point tthere's close to 2,700 minutes of actual flight time. As Brian points out, that's a lot of experience we're about to throw away. :-( > I may be wrong, but if I am it is because the horse was talking out of > the wrong side of it's mouth. [quoted text clipped - 4 lines] > Teddy Roosevelt's mother said: "Fill what is empty, > empty what is full, and scratch where it itches" SignatureGreg Moore SQL Server DBA Consulting Remote and Onsite available! Email: sql (at) greenms.com http://www.greenms.com/sqlserver.html >>>>I know each SSME is refurbished post flight. >>> [quoted text clipped - 14 lines] > But thanks for the information. > Jim in Houston. Don't worry about Derek's crap. He obviously relishes in attacking others. Unfortunately for him the attacks are all too often misplaced. Too bad he refuses to see the positive and resorts to attacking that which he imagines. Signature--- there should be a "sig" here >>>>>I know each SSME is refurbished post flight. >>>> [quoted text clipped - 18 lines] >Unfortunately for him the attacks are all too often misplaced. Too bad he >refuses to see the positive and resorts to attacking that which he imagines. Thanks Clark, I usually don't let it get to me, but I sure don't understand the behavior of some of the "adults" on these newsgroups. I thought Usenet was originally envisioned as a vehicle for education and exchange of information. Some turn it into a "look how much I know" pulpit. I know sometimes my questions are elementary, but I subscribe to the no stupid questions philosophy - usually anyway. I have learned a wealth of knowledge from this NG - and others too. To those who have helped me, I give my heartfelt thanks, to the others - thpffffft! :-p, so there!!! Regards. Jim in Houston. Contrary to popular opinion RN does not mean Real Nerd! Teddy Roosevelt's mother said: "Fill what is empty, empty what is full, and scratch where it itches" SignaturePosted via a free Usenet account from http://www.teranews.com |
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