Method and system for classification and hierarchical diagnosis of abnormalities in large systems

A method for diagnosing and classifying anomalies in a system (10). The method includes steps of acquiring operational data to a system (10) and / or one or more subsystems (12) of system (10) and / or one or more organs (20) / sub systems (12). Then, the method consists in analyzing the operation data using one or more diagnostic models (113). Each diagnostic model (113) uses the operational data to determine an abnormality associated with the probability / organs (20) and / or at / to subsystems (12). Finally, the method is to obtain an overall probability of defect for the subsystem (10) and / or the / subsystems (12) and / or the / bodies (20) using the / abnormalities of probabilities determined by the / diagnostic models (113) and one or more hierarchical relationships between subsystems (12) and the bodies (20) of system (10).