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In a recent twitter Musk wrote: " it makes sense to apply ground delta qual to rocket w toughest entry conditions." referring to 09-24 http://history.nasa.gov/SP-287/ch3.htm http://www.ulalaunch.com/uploads/docs/Published_Papers/Supporting_Technologies/DeltaQualificationTestofAerojetHydrazineThrustersforUseonCentaurduringtheLROandLCROSSMissions20095481.pdf Note pages 10 and 11. Specifically, these should be performance tests of the engines to see how they perform after going through some aging proceedure (such as maybe landing on a barg after a reentry and 5 g slow down). This may be done for several reasons. 1. How has increase launch thrust affected the longevity of the motor. 2. How has reentry from 8800 kmh affected the longevity of the motor. 3. How as the back burn at such high decelerations affected the performance and longevity of the motor. [Add any other reasons to the list]
