Wire strike protection system
The wire strike protection system (WSPS) is a mechanical wire cutter designed to mitigate the risk of wire strikes while flying helicopters at low level. == History == Between 1974 and 1979 wire strike accidents accounted for 8% of United States Army Aviation aircraft damage, 6% of aircraft-related injuries, and 16% of aircraft-related fatalities.
Source: Wikipedia — Wire strike protection system (CC BY-SA 4.0)