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 (MIF), the predefined time period (MIF) including one or several successive time clusters (TC), each time cluster (TC) being delimited by separations (SW) 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 (TC) 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 (TC) 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. <EOS>