The thing is that turbines are incredibly reliable compared to piston engines. The PT6 in particular is known for reliability. Compare the TBO (time between ove

The thing is that turbines are incredibly reliable compared to piston engines. The PT6 in particular is known for reliability. Compare the TBO (time between overhauls) on the IO-540 piston engine originally at 1200 to 2000 hours depending on application to the TBO for the PT6A turbine which is 6000 to 9000 hours depending on model and application. In any case, fixing an aircraft engine in the bush is not really a thing, the concern is forced landings due to engine failure. In airline service engines are monitored and inspected and overhauls are done when there is evidence that it is needed. One CFM-56 on a 737 went over 40,000 hours before being removed from the airplane for rebuild. The extreme reliability of turbine engines is why they permit twin engine airliners to operate on routes that could require up to 370 minutes of single engine operation. That is, the FAA considers the risk of a second engine failure is acceptable for over six hours. [0] [0] https://en.wikipedia.org/wiki/ETOPS https://en.wikipedia.org/wiki/ETOPS