Device for blocking the shut-off of a propulsion engine for aircraft

A blocking device for preventing an inappropriate shut-off of a propulsion engine of an aircraft, the shut-off being executed by a shut-off unit actuated selectively by a controller under selective control of a pilot of the aircraft, the aircraft comprising another propulsion engine, called an opposite propulsion engine, wherein the blocking device comprises:

• a control unit having electronic circuitry configured to:
• enable by default a possible actuation of the shut-off unit by the controller;
• receive information representative of an activated state or an inactivated state of a fuel shut-off lever of the propulsion engine, information representative of a reduced speed state or a non-reduced speed state of a control of the propulsion engine, information representative of a correct operating state or an incorrect operating state of the propulsion engine, information representative of an on state, a shut down state, or a failed state of the opposite propulsion engine, and information representative of a correct operating state or an incorrect operating state of the opposite propulsion engine;
• block the possible actuation of the shut-off unit by the controller, when the fuel shut-off lever of the propulsion engine is in the inactivated state, when the propulsion engine is also in the correct operating state, and when, in addition, the control of the propulsion engine is in the non-reduced speed state;
• and
• block the possible actuation of the shut-off unit by the controller, when the fuel shut-off lever of the propulsion engine is in the inactivated state, when, in addition, the propulsion engine is in the correct operating state, when, in addition, the control of the propulsion engine is in the reduced speed state, and when, in addition, the opposite propulsion engine is in the failed state or the opposite propulsion engine is in the incorrect operating state.