I guess I have been lucky with the B206 I' ve flown or operated, but unscheduled maintenance has been pretty much non-existent, except for the *
Janitrol heater, although right now, "Knock on wood" it works fine.
However "Choppersquad" you asked for operating cost based on 175 hr/yr. Those cost depend alot on the insurance, hangar cost, crew etc.. just figure around 200 USD
pr/hr, or if you are in the UK on 200 Sterling, to be on the safe side and if you have unscheduled maintenance its just your bad luck, its really impossible to estimate the unscheduled maintenance required!
You dont really say if the aircraft is for commercial use or private? If for private then you cant go wrong with a Robinson, but commercially then: