Abstract: The present invention relates to a device for supervising the propulsion system of an aircraft, including a set of sensors (C1, C2, Cn) delivering information regarding the propulsion system. According to the invention, the device moreover includes:a set of peripheral computers (M1, M2, Mp) each implementing a mathematical model representing a sub-system of propulsion system; anda main computer (CAL), which is linked to the set of sensors (C1, C2, Cn) and to the set of peripheral computers (M1, M2, Mp), which checks the intercompatibility of the information delivered by the sensors (C1, C2, Cn) and the compatibility between the information delivered and the results provided by the peripheral computers (M1, M2, Mp).

Abstract: A process and device for detecting the current phase of operation of a system with multiple phases of operation. According to the invention, the operation is partitioned into a set of phases (I to X) from which is chosen a reference phase (I). The set of possible switches to the other phases is determined for each phase. And, a set of parameters is defined for each of the switches, the set of parameters being characteristic of the switch. The sets of parameters are continuously detected. The chain of switches actually involved is determined on the basis of the reference phase (I) with the aid of variations in the parameters, and the current phase of operation is deduced from the chain of switches. Although the invention is applicable to numerous systems, one such system to which it is applicable is the operation of a transport airplane.