The title is voluntarily the opposite of this question: Why isn´t TOGA thrust always 100% N1 or N2?.
I explain to you with an example: I'm looking to the FCOM of an A320 which states that the "maximum in normal operation N1" is 100%, and "the maximum N1 permitted" is 105%. But then, by looking at the THRUST RATINGS - MAXIMUM TAKEOFF page, where there is the table with altitude on the columns and OAT on the rows, the maximum value of N1 that I can find is 94.5%. Any other N1 table (climb/go around/etc.) has clearly lower values for N1. In A320 this value is enforced by the FADEC and cannot be exceeded.
So what's the point to have a 100%-105% N1 limits if the enforced N1 limit in TOGA can be at maximum 94.5%? Why not just set 100% as the RPM value of 94.5%? Or the 94.5% can be exceeded?
Clarification: My question is not related to maximum thrust (which it doesn't correspond to maximum N1). I cannot publish the table, however it's the same of this table, but for another engine and for the maximum takeoff mode instead of maximum climb. I reformulate the question in a more direct way:
- Why FCOM says N1 can reach 100% and 105%, if then no N1 mode allows any N1 value over 94.5%?