RotorAndWing
Final Approach
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Rotor&Wing
At some point, the answer to the OP's question is nobody really knows for most airframes. The truth is, at some point in an airframes life span, we all become test pilots. The life limit on an airframe is typically established by actual experience in the field. How long an airframe go? Nobody really knows until there is a failure trend established. I suspect that for most airframes, that is closer to 20,000 hours, but that's just my WAG.
The original designers and engineers of our planes never dreamed many of these planes would be in regular service this long. They were all supposed to be replaced by now with newer designs, but with GA in decline, we are headed for uncharted territory. A day when airframes over 10,000 hours become the norm, rather than the exception.
Airframe TT is just like damage history. It's a bargaining chip during sales negotiations and that's about it. You can accept the high time at great discount, or move on and find something lower time. I personally think the hardest wear on our planes is the annual inspection!
Yup..... (Great post btw)