So tell me why wire strike protection isn't on all helos?
Safety Study of Wire Strike Devices Installed on Civil and Military Helicopters
http://www.tc.faa.gov/its/worldpac/techrpt/ar0825.pdf
Summary of the findings of the wire strike warning and protection systems:
•The WSPS is most effective when the helicopter impacts the wires nearly perpendicular to the wires in a level attitude and at flight speeds of more than 30 knots.
•The WSPS is available for about 25% of the helicopters.
Page 25, Table 8.
Helicopters Involved in Wire Strikes
Thus, nearly 74% of the helicopters involved in the wire strikes could not have been fitted with wire cutters.