I was pondering that one barit1. N1 and EPR are very closely related. If the EEC were to trim back for an overtemp then yes you would be below your calculated EPR. As for an N1 overspeed that would mean that your EPR was higher than you needed anyway. Trimming back the N1 just brings you back to the power you wanted. I'm no engineer but that would seem to make sense to me.
The RR engines on our 75s which use EPR are not FADEC but they do have EECs and ELTs neither of which limit EGT either.
TC
Last edited by tightcircuit; 7th June 2009 at 18:54.