Originally Posted by
lomapaseo
I don't understand the use of the term "rated on" How does this relate to a term describing a controlling function burried in the FADEC? like pressure output or temperature generated?
For a given pilot demand (throttle lever position) engines are controlled to ('rated to', or 'rated on') a looked-up value of a particular measured engine parameter. That looked-up value is the result of much modelling and discussion between Engine and Airframe people, and relates to delivered power or thrust at a particular flight case.
Some engines are controlled to LP speed as their prime rating parameter; some are rated to EPR; some are rated on turbine exit temperature.