45 years ago there wasn’t any black art to running an IO520, today it appears you need a thermodynamics degree to lean it and manage MP, RPM and the cowl flaps. In 1500 hours of 206/207/210 back then, I never heard of any premature engine rebuilds. What’s changed?
What's changed? The standard of freshly licenced CPL, greatly. There's no way I'd let probably 7 out of 10 of them at the controls of a 206.