8. The unmanned aerial vehicle system according to claim 1 , wherein at least one of said disjunctive exchangeable components is arranged to perform an instantiation in connection with a certificate being issued.
1. An unmanned aerial vehicle system certified for aviation, the unmanned aerial vehicle system comprising: at least two separate disjunctive exchangeable components that are certified for aviation, wherein said disjunctive exchangeable components are hierarchically organized in top-level disjunctive exchangeable components and sub-level disjunctive exchangeable components, wherein said sub-level disjunctive exchangeable components are arranged to comprise disjunctive parts in disjunctive exchangeable components at higher levels, wherein at least a first disjunctive exchangeable component at a sub-level is arranged to provide services to at least one second disjunctive exchangeable component at a higher level and/or to an operator of said unmanned aerial vehicle system; at least one message bus arranged to perform real-time transfers of communications from/to said at least one first disjunctive exchangeable component to/from said at least one second disjunctive exchangeable component, wherein said at least one message bus is connected to or integrated in an internal communication backbone comprising an outgoing communication module configured to establish outgoing communication links, wherein the at least one message bus is certified for aviation; and a predetermined message based interface arranged relative to each of said first and second disjunctive exchangeable components and said at least one message bus such that all communications between said at least one first disjunctive exchangeable component and said at least one second disjunctive exchangeable component are defined in the same single standardized message language, whereby re-certification of any components beside a new or upgraded disjunctive exchangeable component is avoided in said UAV-system.