could well have bought down United 585. There were certainly rotors in the area at the time( they are 100% sure of this because of witness evidence, pilot reports, and rotor clouds visible)and if it was a large/powerful enough rotor a 737-200 wouldn't stand a chance! Although it has never been 100% confirmed it was due to either one of these 2 scenarios 1) rotors 2) rudder hardover, the facts obtained seem to point toward the the former.