Abstract: Method and device for detecting oscillatory faults in a positional servocontrol arrangement for an aircraft control surface. The detection device comprises means for estimating a reference position of the control surface, with the aid of a model in which at each iteration a residual value of the previous iteration, multiplied by a dynamic gain, is injected, and means for detecting an oscillatory fault with the aid of this reference position.

Abstract: The detection device includes, but is not limited to a device that is configured to determine a control error corresponding to the difference between a first control instruction and a control surface position, a second device that is configured to calculate the difference between this control error and a second control instruction in such a way as to form a comparison signal, and a third device that is configured to detect a jamming of the control surface if this comparison signal is greater than a threshold value.

Abstract: Method and device for detecting an uncontrolled movement of an aircraft control surface. The detection device (1) comprises means (29) for calculating the difference between a theoretical command and an actual command in order to form a residual value, and means (40) for detecting an uncontrolled movement of the control surface, if a comparison value depending on this residual value is greater than a threshold value (?).

Abstract: Automatic estimation process and device for a flight parameter vector in an aircraft, as well as detection methods and assemblies for a failure affecting such a vector. The detection device (1) comprises means (5) for estimating, on an observation window, a coefficient vector allowing to determine a linear relationship between the searched flight parameter vector and explanatory values, by implementing a PLS regression, and means (5) to use such a coefficient vector so as to calculate, thru a linear modeling, an estimated value of said flight parameter vector.

Abstract: A method and device for detecting oscillatory faults relating to an aircraft airfoil slaving chain. The device includes units that count the number of overshoots of a threshold value by the current value of a quantity related to the positional slaving of an airfoil. Oscillatory fault is detected based on the number of overshoots of the threshold value being greater than the current value by a predetermined number.

Abstract: A device for counting oscillations of an oscillating temporal signal. The device comprises means for counting all the alternate crossings of a positive threshold value and of a negative threshold value by a monitored time signal.

Abstract: Disclosed is a method and device for estimating forces exerted on at least one aircraft control surface. The method includes steps of, and the device includes components that carry out steps that include: generating current aircraft flight data; determining, from the generated aircraft flight data, a value Bl based on current deflection data and geometrical characteristics of a lever arm actuator of the at least one aircraft control surface; calculating, from the determined value Bl, at least one hinge moment; summing each calculated hinge moment; and dividing the sum by the value Bl to obtain an estimate of the forces exerted on the least one aircraft control surface.

Abstract: Disclosed is a method of detecting at least one oscillatory fault in at least one positional slaving chain for at least one airfoil of an aircraft. The method involves estimating a reference position of the airfoil in the absence of a fault, and calculating a residual value based on the difference between the estimated reference position and the actual position measured by at least one sensor. The calculated residual value is compared with at least one predetermined threshold value to determine the number of successive and alternating overshoots of the predetermined threshold value by the residual value, and oscillatory fault is determined based on the determined number.

Abstract: The device (1) comprises means (11) for summing various hinge moments calculated, and means (13) for dividing this sum by the value of a lever arm in such a way as to obtain an estimate of the forces exerted on the control surface.

Abstract: The detection device (1) comprises means (19) for estimating, with the aid of a model, a reference position of the airfoil, as well as the values of parameters of said model making it possible to update it, and means (21, 23) for detecting an oscillatory fault with the aid of this reference position.

Abstract: A method and device for detecting oscillatory failures in a position servocontrol subsystem of an aircraft control surface. The detection device includes a estimation unit for estimating, using a control surface control instruction, a theoretical position corresponding to a reference position of the control surface, a computing unit for computing the difference between this theoretical position and an actual position measured by a sensor so as to form a residual value, and a comparison unit for comparing this residual value to a threshold value and making a count of the overshoots of this threshold value in order to detect an oscillatory failure.

Abstract: Method and device for detecting oscillatory faults relating to an aircraft airfoil slaving chain. The device (1) comprises means for carrying out a counting of all the overshoots of a threshold value by the current value of a quantity related to the positional slaving of an airfoil (3), and for detecting an oscillatory fault as soon as the number resulting from said counting becomes greater than a predetermined number.

Abstract: A device for counting oscillations of an oscillating temporal signal. The device comprises means for counting all the alternate crossings of a positive threshold value and of a negative threshold value by a monitored time signal.

Abstract: Method and device for detecting oscillatory failures in a position servocontrol subsystem of an aircraft control surface. The detection device (1) comprises means (19) for estimating, using a control surface control instruction, a theoretical position corresponding to a reference position of the control surface, means (21) for computing the difference between this theoretical position and an actual position measured by a sensor so as to form a residual value, and means (23) for comparing this residual value to a threshold value and making a count of the overshoots of this threshold value in order to detect an oscillatory failure.