Method for verifying the rotor drive freewheels of a twin-engine helicopter

Abstract

The invention relates to a method for checking the freewheels (RL1, RL2) of an aircraft comprising a main rotor (RP) coupled to a first engine (M1) and a second engine (M2), respectively, by a first and second freewheel (RL1, RL2), and wherein the first and second engines (M1, M2) and the main rotor (RP) are equipped with speed sensors (C1, C2, CP) connected to a control and command unit (CCU). This method comprises the steps of: – activating the first engine (M1) to rotate it at its nominal speed and deactivating the second engine (M2), then collecting the speeds of the first and second engines (M1, M2) and the main rotor (RP); – emitting an alert signal if the difference between the speed of the first engine (M1) and that of the main rotor (RP) exceeds a threshold value, or if the speed of the second engine (M2) exceeds the threshold value. Figure for the abstract: Single figure.