A hybrid propulsion installation for an aircraft, comprising: - an internal combustion engine comprising at least one combustion chamber; - at least one electricity generator (134a, 134n) coupled to the internal combustion engine such that in operation the internal combustion engine drives said or each electricity generator (134a, 134n); - an electrical propulsion system coupled to said or each electricity generator (134a, 134n) such that in operation said or each electricity generator (134a, 134n) drives the electrical propulsion system; - electromechanical protection means (136a, 136n) arranged between said or each electricity generator (134a, 134n) and the electrical propulsion system, each electromechanical protection means (136a, 136n) being capable of being in a so-called closed position in which an electrical current is transmitted from the electricity generator (134a, 134n) to the propulsive electrical system or in a so-called open position in which the transmission of the electrical current from the electricity generator (134a, 134n) to the electrical propulsion system is interrupted; - an electronic computer configured to: - receive at least one piece of information about the position of the electromechanical protection means (136a, 136n); and, - receive at least one piece of information about a speed of rotation of a shaft of the internal combustion engine, said hybrid propulsion installation being characterised in that the electronic computer is configured to: - control the flow of fuel supplying the combustion chamber based on said received pieces of information. - an internal combustion engine comprising at least one combustion chamber; - at least one electricity generator (134a, 134n) coupled to the internal combustion engine such that in operation the internal combustion engine drives said or each electricity generator (134a, 134n); - an electrical propulsion system coupled to said or each electricity generator (134a, 134n) such that in operation said or each electricity generator (134a, 134n) drives the electrical propulsion system; - electromechanical protection means (136a, 136n) arranged between said or each electricity generator (134a, 134n) and the electrical propulsion system, each electromechanical protection means (136a, 136n) being capable of being in a so-called closed position in which an electrical current is transmitted from the electricity generator (134a, 134n) to the propulsive electrical system or in a so-called open position in which the transmission of the electrical current from the electricity generator (134a, 134n) to the electrical propulsion system is interrupted; - an electronic computer configured to: - receive at least one piece of information about the position of the electromechanical protection means (136a, 136n); and, - receive at least one piece of information about a speed of rotation of a shaft of the internal combustion engine, - receive at least one piece of information about the position of the electromechanical protection means (136a, 136n); and, - receive at least one piece of information about a speed of rotation of a shaft of the internal combustion engine, - control the flow of fuel supplying the combustion chamber based on said received pieces of information.