Turbofan Flat Rating
EGT is proportional to the Turbine Inlet Temperature and the TIT indicates how much energy there is to turn the Turbines and hence rotate the Compressors.
Operate the turbofan engine at a particular EGT at ISA conditions now and we get 50,000 lbs Thrust.
Years down the road, we operate it at the SAME EGT and ISA, we still get 50,000 lbs Thrust ?