Snecma

Severine Chevalier

Alain Tiepel

Jose Roland Rodrigues

Jose Rodrigues

The present invention relates to a method for differentiating control failures in a system for controlling an actuator () determining the position of a member for modifying the state of a gas-turbine engine, the system including a single- or dual-channel electric control and a mechanical control, the electric control including one computer (') per channel, only one of which is active at any given time in order to calculate the set position of the movable member of the actuator () and to transmit a set signal to the single-channel mechanical control of the actuator, a failure being diagnosed when a deviation is detected between the set position of the movable member of the actuator and the position thereof measured during a predetermined deviation confirmation time. The method is characterised in that the speed of movement of the actuator is measured and in that the system diagnoses an electrical failure when, during said time for confirming the deviation, the measured speed of movement is other than zero and remains higher than a predetermined threshold speed; otherwise, the failure is diagnosed as being of temporary mechanical origin.

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Moissy-Cramayel, France

Severine Chevalier