System and method for monitoring an aircraft engine

A system for monitoring an aircraft engine, including:

• an acquisition module configured to acquire, during a flight time of the aircraft, current measurements of physical quantities, referred to as physical input quantities and physical output quantities, relating to said aircraft engine and its environment,
• a module for simulating the physical behavior of said aircraft engine, configured to simulate values of physical output quantities as a function of said current measurements of physical input quantities observed in real time,
• a processor configured to calculate, during a preliminary learning phase in an earliest time period, at each of a plurality of instants of real time, physical margins, referred to as actual margins, between said simulated values of physical output quantities and said corresponding current measurements of physical output quantities observed in real time,
• a learning module configured to predict, during an operational phase in remaining time periods following the learning phase for a plurality of the instants of real time, margins, referred to as predicted margins, the predicted margins being expected actual margins between the simulated values and the current measurements of physical input quantities based on the actual margins that were already calculated in past time periods that have elapsed, and
• wherein said processor is further configured to calculate monitoring residuals as a difference, at each instant of time, between (i) said actual margins that are calculated by said processor during the operational phase between said simulated values of physical output quantities and said corresponding current measurements of physical output quantities observed in real time and (ii) said predicted margins that are predicted from the learning module, said monitoring residuals giving an indication of the state of the aircraft engine, such that the monitoring residuals are only calculated during the operational phase and the actual margins are calculated during both the learning phase and the operational phase,
• wherein the system further comprises a display interface for viewing graphical representations of said monitoring residuals, and the processor is configured to control the display interface to display the graphical representations of said monitoring residuals as a scatterplot graph that includes a plurality of time periods which form (i) the preliminary learning phrase in the earliest time period, where only the actual margins are displayed and (ii) the operational phase in the remaining time periods where the monitoring residuals are displayed in addition to the actual margins.