Abstract: A method for determining a predictive model of a pressure ratio P1/P2 for a bypass turbomachine of previously defined type including primary and secondary air paths separated by an inter-path compartment, the P1 pressure corresponding to an air pressure inside the inter-path compartment, the P2 pressure corresponding to an air pressure in the secondary air path. The method includes acquiring, on a test turbomachine in operation, at respective measurement times, sets of measurements each including a P1 measurement, a P2 measurement, a measurement M of a Mach number of the test turbomachine, and a PCN12R measurement representing a low pressure rating, obtaining the sets of measurements by a processing device, supervised learning, by the processing device and on the basis of the sets of measurements obtained, of a predictive model of the ratio P1/P2 as a function of the M number and of the PCN12R rating considered as explanatory variables.

Abstract: A method for monitoring degradation of an onboard device of an aircraft, implemented by a computer, the degree of degradation of the onboard device being defined by an abnormality score formed by the counting of occurrences of abnormalities noted by a control system of the device, the monitoring method comprising a step of comparing an abnormality score obtained for an observation sequence of given length (n, t) with a decision threshold (ks) and a step of issuing an alarm in the event of the decision threshold (ks) being reached or exceeded, the decision threshold (ks) being determined automatically for a given probability of alarm Pa, corresponding to the probability that an alarm will be issued during the monitoring method whereas the onboard device is sound, by means of the following steps: a step of obtaining an abnormality score (r) on at least one reference sequence corresponding to flights of the aircraft without degradation and with a length (m, tc) equal to a plurality of lengths (n, t) of observ

Abstract: A method for monitoring degradation of an onboard device of an aircraft, implemented by a computer, the degree of degradation of the onboard device being defined by an abnormality score formed by the counting of occurrences of abnormalities noted by a control system of the device, the monitoring method comprising a step of comparing an abnormality score obtained for an observation sequence of given length (n, t) with a decision threshold (ks) and a step of issuing an alarm in the event of the decision threshold (ks) being reached or exceeded, the decision threshold (ks) being determined automatically for a given probability of alarm Pa, corresponding to the probability that an alarm will be issued during the monitoring method whereas the onboard device is sound, by means of the following steps: a step of obtaining an abnormality score (r) on at least one reference sequence corresponding to flights of the aircraft without degradation and with a length (m, tc) equal to a plurality of lengths (n, t) of observ