Thanks for the info everyone. I spoke to a local EC120 operator and was informed the costs I could expect:
- $5k/yr for 100hr inspection
- $25k every 2 yrs
- $60k every 7 yrs
- $250k every 12 yrs
- $250k turbine overhaul
- very limited unscheduled maintenance in their experience (basically no AoG time for their machine) but if you do get something, parts can be weeks or even a couple months
I do wonder if the 12 yr would be slightly less for me as a low usage private guy (100hrs/yr). The machine this operator has flies north of 600/yr. Expect they might discover more on a 12yr inspection compared with a private machine.
Have done some research and perhaps revised price expectations to ~$850k for a good machine (<1000hrs, recent 12 yr complete). I find the list prices on internet to be much higher than what they might sell for. Broker recently indicated to be that a machine is pending sold at $250k less than what the ask was.