From: earlcp@idirect.com   
      
   Andrew Nowicki  :   
      
   > Damon Hill wrote:   
      
   > > The SSME is the most obvious example...   
      
   > The space shuttle main engine is the   
   > most obvious example of the engine that   
   > is salvageable rather that reusable.   
      
   It is my understanding that was the case at first, all the early shuttle   
   flights had the engine overhauled after each flight.  But this allowed them   
   to see how much wear a flight caused resulting in more than one flight being   
   added between overhauls.  I believe the shuttles now fly four times between   
   overhauls now and may extend further if key parts are replaced with better   
   materials.   
      
                      Earl Colby Pottinger   
      
      
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