A method for installing avionics software applications on a platform intended to be on board an aircraft, the platform comprising a multi-core processor having a plurality of separate cores, each avionics software application including one or several software processing operations to be executed over a predefined time period, the predefined time period including one or several successive time clusters, each time cluster being delimited by separations each corresponding to a multi-core synchronous switching performed on all the cores of the multi-core processor, the installation method being implemented by an electronic installation device and comprising the following step: - determining an installation plan for the software processing operations according to at least one rule from among a first installation rule and a second installation rule, the installation plan defining, for each software processing operation, at least one core and at least one time cluster that are associated with said software processing operation, + the first installation rule consisting of predetermining a list of authorized combinations of criticality levels for applications intended to be executed during a same time cluster on the platform, + the second installation rule consisting of prohibiting the installation of critical software application(s) on one or several cores of the plurality of cores of the multi-core processor, each critical software application having a criticality level greater than or equal to a predefined threshold, the criticality level corresponding to a DAL level defined according to standard DO-178 revision B, or according to standard ARP4754. - determining an installation plan for the software processing operations according to at least one rule from among a first installation rule and a second installation rule, the installation plan defining, for each software processing operation, at least one core and at least one time cluster that are associated with said software processing operation, + the first installation rule consisting of predetermining a list of authorized combinations of criticality levels for applications intended to be executed during a same time cluster on the platform, + the second installation rule consisting of prohibiting the installation of critical software application(s) on one or several cores of the plurality of cores of the multi-core processor, each critical software application having a criticality level greater than or equal to a predefined threshold, the criticality level corresponding to a DAL level defined according to standard DO-178 revision B, or according to standard ARP4754. + the first installation rule consisting of predetermining a list of authorized combinations of criticality levels for applications intended to be executed during a same time cluster on the platform, + the second installation rule consisting of prohibiting the installation of critical software application(s) on one or several cores of the plurality of cores of the multi-core processor, each critical software application having a criticality level greater than or equal to a predefined threshold, the criticality level corresponding to a DAL level defined according to standard DO-178 revision B, or according to standard ARP4754.