Preliminary data based on the notification from the Italian authorities:
During landing of an HEMS operation, when very close to the ground, the helicopter suddenly started large oscillations, horizontally and vertically. Several low altitude obstacles were present in the helipad area. After more than one minute, the aircraft got again under control and landed without further consequences. During the oscillations, the alarm Fadec degraded lighted up. Overtorque was also recorded. Mast replacement was required.