The invention relates to a rotorcraft transmission system that comprises both a transmission shaft (21), and electromagnetic induction members (30, 31) of an active magnetic damper that extend around the shaft and that co-operate therewith to determine radial clearance (33). The system further comprises an additional radial damper (35) extending around the shaft with radial spacing (29) that is smaller than the radial clearance, such that in the event of the active magnetic damper failing, radial displacements of the shaft relative to its axis (22) are damped at least in part by the additional radial damper, so that damage to the induction members is limited or avoided.
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