Aircraft, comprising: a first fire zone and a second fire zone distinct from the first fire zone, corresponding to zones of the aircraft that contain sources of ignition and the risk of a flammable liquid leak, and a fuel supply regulation and protection system for an aircraft engine, comprising an engine control computer generating a fuel mass flowrate setpoint; a fuel metering unit for the aircraft engine, comprising a metering member configured to receive a command signal and to meter the fuel supply to the engine as a function of said command; a shut-off member configured to shut off the fuel supply to the engine wherein the fuel metering unit further comprises an engine protection and shut-off computer configured to: receive data for evaluating the instantaneous value of the engine speed; compare the instantaneous engine speed value with a predefined engine speed threshold value and determine a potential overspeed condition on the basis of this comparison; transmitting a control signal to a shut-off control member contained in the shut-off member to shut off fuel supply to the engine if an engine overspeed condition is determined, and characterised in that the fuel metering unit is installed in the first fire zone of the aircraft, and the engine control computer is installed in the second fire zone. a first fire zone and a second fire zone distinct from the first fire zone, corresponding to zones of the aircraft that contain sources of ignition and the risk of a flammable liquid leak, and a fuel supply regulation and protection system for an aircraft engine, comprising an engine control computer generating a fuel mass flowrate setpoint; a fuel metering unit for the aircraft engine, comprising a metering member configured to receive a command signal and to meter the fuel supply to the engine as a function of said command; a shut-off member configured to shut off the fuel supply to the engine wherein the fuel metering unit further comprises an engine protection and shut-off computer configured to: receive data for evaluating the instantaneous value of the engine speed; compare the instantaneous engine speed value with a predefined engine speed threshold value and determine a potential overspeed condition on the basis of this comparison; transmitting a control signal to a shut-off control member contained in the shut-off member to shut off fuel supply to the engine if an engine overspeed condition is determined, and characterised in that the fuel metering unit is installed in the first fire zone of the aircraft, and the engine control computer is installed in the second fire zone. receive data for evaluating the instantaneous value of the engine speed; compare the instantaneous engine speed value with a predefined engine speed threshold value and determine a potential overspeed condition on the basis of this comparison; transmitting a control signal to a shut-off control member contained in the shut-off member to shut off fuel supply to the engine if an engine overspeed condition is determined, and characterised in that the fuel metering unit is installed in the first fire zone of the aircraft, and the engine control computer is installed in the second fire zone.