Folks,
Just to remind the man with the "light sabre" complex, US (at least) engine manufacturers do not publish TBO, they publish "recommended" TBO, a not very subtle difference.
As for FAA requirements (after all, the number of aircraft in the US makes for statistically significant data) see the regulations applying to type of operation, ie: Part 91, 125, 135 etc.
Tootle pip!!