Helitubby,
Speak to Clint Watt (ex Eurocopter?)
Apparently there is a software problem that does give a false "OVER LIMIT DETECTED", especially if a higher than normal (not necessarily an exceedence) Nr is experienced, e.g. during quickstop, auto's etc.
Radio masts and weather as cause I haven't experienced and can't comment on that.
Can tell you that I worked for a utility company in SA that used the EC120 extensively for powerline work, optic fibre stringing on the powerlines and never had any interference with electricity on the EC120 and some of the lines carried 400Kv that we worked on and over.
