I understand that you're telling the FMC to give you an N1% that works out as the thrust equivalent for the current temperature (14degC) as if you were taking off in actual conditions of 45degC with an N1% of 90.7.
Whereas the N1% of 91.8 is to achieve the same thrust (20K in this case) in 45degC conditions as 90.7 would achieve in 14degC.
Clear as mud?
Last edited by Sciolistes; 14th Oct 2012 at 06:28.