N1 RATED MODE – In the N1 rated mode, the FADEC controls engine N1 as a function of thrust lever position, temperature, and altitude while preventing the engine from exceeding operating limits. Thrust is controlled in the same manner as in the normal mode without auto thrust.

What does N1 mean on a plane?

The N1 Indicator is a cockpit gauge which presents the rotational speed of the low pressure (low speed) engine spool, a speed that is referred to as N1. The gauge is usually calibrated in percent RPM based on an engine manufacturer defined rotational speed that corresponds to 100%.

What is N1 trim?

N1 trim is the difference of the real N1 needed for the real thrust provided, determined on the testcell only. The testcell measures the real produced thrust. Every engine is a bit different, so the N1 for each engine is different too for the same thrust.

The N2 Indicator is a cockpit gauge which, in most installations, presents the rotational speed of the high pressure (high speed) engine spool, a speed that is referred to as N2.