From: snidely.too@gmail.com   
      
   Sunday, JF Mezei quipped:   
   > On 2020-10-04 17:51, Alain Fournier wrote:   
   >   
   >> Last second aborts are usually because something that should happen in   
   >> the last seconds before launch didn't happen the way it was supposed to   
   >> do. They don't just wait until the clock ticks to zero and then flip the   
   >> switch for launch. There is a sequence, and if something goes wrong in   
   >> the sequence they abort.   
   >   
   > I just find it odd that such things would fail at last second, but   
   > appeared to work fine during testing prior to launch.   
   >   
   > I assume launch companies/NASA get a good idea in post mortems on what   
   > caused such last second failures ?   
      
   In the most recent case discussed here, the issue arose in the last   
   seconds because it involved propellant flow in the gas generator(s),   
   which you don't do 15 minutes or an hour before launch.   
      
   The hardware involved, by the way, had already passed acceptance   
   testing (hot fire) in Texas, and a static fire test on Sep 25 in   
   Florida.   
      
   /dps   
      
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