If the 206 was used for Part 135 then they had to overhaul or replace it. Part 135 is different than Part 91. But the props do not magically start to disintegrate at 10 years or 11 years or whenever. If its not leaking oil you should get a bunch more hours out of it. The concern with age is corrosion. If the prop has 600 hours on it in 10 years, it was flying more each year than most of the posters here.

More importantly, the 3 blade prop is heavier than the 2 blade that came off your ship. What does the weight and balance calculation say about adding another 20lbs out on the pointy end of the airplane?

Best of luck,

Wes
N78PS