Consider a a company working with FARs in the US. The company uses the airplane for commercial use but does not carry passengers. The Chief Mechanic states that Continental engines no longer use the term "recommended" when discussing TBO, but instead state that the TBO is a limit.
I agree with the need to overhaul the engine at TBO, but there is a lot of commercial pressure to go past TBO as "on condition".
Is the Chief Mechanic right? Is there an FAR that refers?