Extreme P
It would be helpful if you named the aircraft you are talking about.
Shon7
You must remember that thrust isnt a constant, it will vary with thrust rating, temperature and pressure altitude, you cant therefore just say dont exceed 90% N1.
Some aircraft, (Classic 747) have a human interface called the Flight Engineer, his/her task is to calculate a charted EPR value and set it manually in the EPR Limit computer. Other aircraft (777/MD11/744), the crew enter specific data into the FMC, that in turn displays the required thrust requirement.
Mutt