Method for the execution of services in real time flight management system

A system executes services by a "server" for a "client". A preliminary step establishes a list of available services of the server, set up for the client, in which a processing time is determined releasable by the server for the client per code execution cycle minor frame ("MIF"). The system creates on start-up: NT execution tasks for the client, each having a priority of execution level and an allocated average duration of execution, a number of execution tasks (NT) being at least 1, the sum of durations of the tasks being at most the releasable processing time; execution rules associating each of the tasks with at least one service of the list; then, during each MIF cycle, the system executes the services on their associated tasks, a task executed by priority and for at most its allocated average time of execution, the non-executed part of a service being executed on its associated task in the next cycle.