How the South Africans did it
Many of us here have no idea just how serious the military activities in the south of Africa were back in the 80s. The link above shows how the right crews, aircraft, training and equipment can tackle enemy helicopters successfully. I would certainly agree that the GAF were on the right lines with their Alpha Jets, and also that an A10 with attitude is the most dangerous air threat to any heli.
Now to find my pics from Brunei showing nylon kite-string around the rotor-head of my 212 - I was lucky it wasn't the stuff they use for kite-fighting, where the nylon is coated with ground-glass to cut the competitors kitestring.