FAILURE: GSLV - GSAT-5P - December 25, 2010

• #280 by Salo on 20 Apr, 2011 20:17
• http://www.hindu.com/2011/04/21/stories/2011042157600900.htm
• #281 by Salo on 21 Apr, 2011 18:25
• http://economictimes.indiatimes.com/news/politics/nation/isro-to-conduct-gslv-test-flight-in-2012-with-russian-cryogenic-stage-engine/articleshow/8044557.cms
• #282 by input~2 on 21 Apr, 2011 19:22
• Quote from: Salo on 21 Apr, 2011 18:25

  http://economictimes.indiatimes.com/news/politics/nation/isro-to-conduct-gslv-test-flight-in-2012-with-russian-cryogenic-stage-engine/articleshow/8044557.cms

  
  Compare these 2 extracts:
  "Of the seven engines procured from Russia, only two are left, said Ramakrishnan."
  and "Only two of the seven GSLV launches have been total successes."
  
  AFAIU, 6 MKI + 1 MKII = 7 launches
  ISRO should have only one Russian engine left...
  
• #283 by Salo on 21 Apr, 2011 22:05
• Yes, it is.
  There is only one 12KRB with KVD1A engine.
• #284 by Shams on 23 Apr, 2011 07:42
• Weak Russian component downed Indian rocket: Ex-ISRO chief
  
  The destruction of India's Geosynchronous Satellite Launch Vehicle (GSLV) in mid air in 2010 was due to an inherent weakness in a component in the Russian supplied cryogenic engine.
  
  Read more.........
  
  http://mangalorean.com/news.php?newstype=local&newsid=234229
  
  shams
• #285 by kevin-rf on 06 Jun, 2011 12:58
• http://www.aviationweek.com/aw/generic/story.jsp?id=news/asd/2011/06/03/09.xml&headline=No%20Design%20Fault%20Found%20In%20Indian%20GSLV&channel=space
• #286 by Salo on 13 Jul, 2011 12:40
• http://www.livemint.com/2011/07/08213841/K-Radhakrishnan--Flight-stage.html?h=B

  Quote

  So what about the seventh cryogenic engine from Russia? There were reports that both Isro and Russia disagreed on technical reasons for the failure of the most recent GSLV mission in December.
  
  The last two engines (the sixth and seventh) have greater thrust than previous engines. They was supplied in 2004 and 2005, and stored in specified conditions. So the reason for the failure (in December) was the inadvertent snapping of the connectors, well before time [connectors are critical for controlling the vehicle]. This happened because the shroud gave away (the shroud is a casing that separates the liquid and solid stages of the launch cover). It’s a cover that sits on (the) bottom of the cryogenic stage. Now, why did the shroud go? Was it the 4m heat shield? We then realized that it was the inherent vulnerability of the shroud. The shroud was at the bottom of the cryogenic stage. There were 10 connectors in two stages, and both gave way. Initially, the Russians said it was our 4m shield that was responsible. We put both our analyses, and finally the Russians also came around. We then decided that the seventh engine has to be inspected, too. We did it and found that they weren’t made in the dimensions specified to in the document. There are lots of shortcomings, and the Russians admitted it. Now, the point is that this has to be corrected before it can be used for launch and would require a detailed inspection by them.
• #287 by chota on 19 Jul, 2013 13:10
• Resurrecting an old thread
  
  http://www.indiastrategic.in/topstories986.htm
  
  "The fault was there from the first GSLV that flew with the Russian cryogenic engine in 2001. The weakness in the shroud caught ISRO on December 25 last year,"
  
  "All GSLV's that flew with Russian cryogenic engine have encountered problems carrying a payload of over 2,000 kg"
  
  "In 2007, one of the connecters of the GSLV rocket got snapped and the rocket's performance was considered as below par. The rocket had carried 2,130 kg INSAT-4CR satellite"
  
  
• #288 by K210 on 18 Aug, 2013 06:57
• Quote from: chota on 19 Jul, 2013 13:10

  Resurrecting an old thread
  
  http://www.indiastrategic.in/topstories986.htm
  
  "The fault was there from the first GSLV that flew with the Russian cryogenic engine in 2001. The weakness in the shroud caught ISRO on December 25 last year,"
  
  "All GSLV's that flew with Russian cryogenic engine have encountered problems carrying a payload of over 2,000 kg"
  
  "In 2007, one of the connecters of the GSLV rocket got snapped and the rocket's performance was considered as below par. The rocket had carried 2,130 kg INSAT-4CR satellite"
  
  
  

  
  The latest GSLV has a onboard camera to monitor the shroud.