The invention relates to a method and a system for predicting maintenance operations on a current aircraft engine, comprising: processing means to compare a set of failure models (M1, . . . , Mn) adapted to said current engine to select a relevant failure model (Mi) with a failure age (T0) defining the age of said engine at the time of the failure; processing means to associate decision rules (R) about the workscope on said current engine with said relevant failure model (Mi), as a function of a set of parameters (P1, P2, Pi) related to said current engine; and processing means to determine the required maintenance workscope (Wf) to be applied to said current engine, as a function of said decision rules.