Shortround6
Major General
A lot of life of engines depends on their use, The "at least 3,000 hours" was pulled from memory of old magazine articles. I just checked the internet and found this for the smaller PT-6 engines used in the Beechcraft 1900.
"Overhaul:
TBO is 9,000 hours or 14 years, whichever comes first (since new or
since overhaul as applicable)"
This is with a specific inspection and use schedule. (min 30 hours a month) and is a modification of the previous overhaul life. and this is from a 2005 article.
Or see; Turbine DC-3 Turbo Dakota DC3 Turbine Conversion Aircraft from Dodson International Parts
6000 hours basic TBO for essentially the same engine.
A modern piston engine may be able to do better than an old one with modern materials/manufacturing but modern turbo-props and turbo fans can exceed 10,000 hours depending on model, application and maintenance program. And maintenance between major overhauls is a lot less, ( no changing 24-56 spark plugs or adjusting 28-56 valves ever few dozen to few hundred hours)
There is a reason why even crop dusters replaced P&W R-995 and R-1340 engines decades ago. The Turbines were much more expensive to buy up front but the lower maintenance costs per flying hour tipped the balance.
"Overhaul:
TBO is 9,000 hours or 14 years, whichever comes first (since new or
since overhaul as applicable)"
This is with a specific inspection and use schedule. (min 30 hours a month) and is a modification of the previous overhaul life. and this is from a 2005 article.
Or see; Turbine DC-3 Turbo Dakota DC3 Turbine Conversion Aircraft from Dodson International Parts
6000 hours basic TBO for essentially the same engine.
A modern piston engine may be able to do better than an old one with modern materials/manufacturing but modern turbo-props and turbo fans can exceed 10,000 hours depending on model, application and maintenance program. And maintenance between major overhauls is a lot less, ( no changing 24-56 spark plugs or adjusting 28-56 valves ever few dozen to few hundred hours)
There is a reason why even crop dusters replaced P&W R-995 and R-1340 engines decades ago. The Turbines were much more expensive to buy up front but the lower maintenance costs per flying hour tipped the balance.