Aided preventive diagnostics of an aircraft system, comprising a plurality of subsystems at least one of which comprises a subsystem configured for monitoring and notifying a detected event, using critical event charts. After receiving a message notifying the occurrence of said detected event, a minimal diagnostic set relative to said at least one detected event, comprising a plurality of elements each represented by a node of said critical event chart is created, each element of said minimal diagnostic set being determined according to at least one logical implication relation of said critical event chart with a node representing said at least one received notification message. At least some of the elements of said minimal diagnostic set are then ranked, said ranked elements forming part of said diagnostic report.
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