Control system for at least one controlled device of an aircraft, this control system being able to be embedded onboard the aircraft and comprising: - at least two distinct communication networks (20A, 20B); and - at least one control unit associated with this at least one controlled device, this control unit being connected to at least one of the said communication networks (20A, 20B), the said control system being configured to determine and provide control commands to this controlled device, the determination of the said control commands corresponding to a first function of the aircraft having a DAL-A quality assurance level requirement, characterized in that the said control system furthermore comprises: - a set of at least three physical units (11, 12, 13, 14) each comprising an electrical power supply (AL1, AL2, AL3, AL4) and a network interface device (R1, R2, R3, R4) connected to at least one of the said communication networks (20A, 20B) of the aircraft, in which:. the electrical power supplies of the various physical units are of at least three different types;. the network interface devices of the various physical units are of at least three different types;. each of the physical units comprises at least two computers (C1.1, C1.2,... C4.6) each comprising an operating system;. the various computers of the various units are of at least two different types;. the operating systems of the various computers are of at least two different types;. at least six of the said computers are configured to independently determine control commands for the said controlled device, these control commands corresponding to the said first function;. the various computers each have a DAL-C, DAL-D or DAL-E hardware and/or software quality assurance level; and - a selection logic unit whose hardware and software quality assurance level is DAL-A, this selection logic unit being connected to these at least two communication networks (20A, 20B) and being configured to select valid control commands from among the control commands determined by the computers, the control unit associated with the said controlled device being configured to control the controlled device as a function of the valid control commands selected by the selection logic unit. - at least two distinct communication networks (20A, 20B); and - at least one control unit associated with this at least one controlled device, this control unit being connected to at least one of the said communication networks (20A, 20B), - a set of at least three physical units (11, 12, 13, 14) each comprising an electrical power supply (AL1, AL2, AL3, AL4) and a network interface device (R1, R2, R3, R4) connected to at least one of the said communication networks (20A, 20B) of the aircraft, in which:. the electrical power supplies of the various physical units are of at least three different types;. the network interface devices of the various physical units are of at least three different types;. each of the physical units comprises at least two computers (C1.1, C1.2,... C4.6) each comprising an operating system;. the various computers of the various units are of at least two different types;. the operating systems of the various computers are of at least two different types;. at least six of the said computers are configured to independently determine control commands for the said controlled device, these control commands corresponding to the said first function;. the various computers each have a DAL-C, DAL-D or DAL-E hardware and/or software quality assurance level; and. the electrical power supplies of the various physical units are of at least three different types;. the network interface devices of the various physical units are of at least three different types;. each of the physical units comprises at least two computers (C1.1, C1.2,... C4.6) each comprising an operating system;. the various computers of the various units are of at least two different types;. the operating systems of the various computers are of at least two different types;. at least six of the said computers are configured to independently determine control commands for the said controlled device, these control commands corresponding to the said first function;. the various computers each have a DAL-C, DAL-D or DAL-E hardware and/or software quality assurance level; - a selection logic unit whose hardware and software quality assurance level is DAL-A, this selection logic unit being connected to these at least two communication networks (20A, 20B) and being configured to select valid control commands from among the control commands determined by the computers, the control unit associated with the said controlled device being configured to control the controlled device as a function of the valid control commands selected by the selection logic unit.