Thanks for the reply - interesting stuff. Like someone mentioned in the thread linked above, I guess when you're squeezing out fuel efficiency, tolerences will be tighter so measures like this need to be taken for protection. You mentioned slower to start anyway, is that because of larger diameter fan, smaller core,or some other reason? Does the APU output the same starting force as on the CEO?
And I assume as the cooling cycle motors to 25% N2 it can't (/shouldn't, at least with doors not yet closed
) be done on stand prior to push?