Wayne,
It seems to me that the term damage history is often misinterpreted or misused.
Damage that occurs as a result of normal operation (as in the case of the stuck valve) should not be termed damage history as the engine was performing the function it was intended to perform. Replacing a cylinder actually is just a standard parts replacement, not repair. The term damage history should be reserved for those instances where damage occurs due to forces outside the scope of normal operation (such as ground-loops, bird-strikes, prop-strikes, etc..).
Pulley's freeze all the time but we don't term that as damage history. Rusted cables, clogged injectors, etc.
Funny that the term damage history isn't in part 1 of the FAR's. But neither is the term airworthy!
Just some thoughts,
Mike Sammons
Mike,
This is one of those cases in which we can agree to disagree.
The point of my original post was that damage that is properly repaired and documented should not have any tangible effect on the airworthiness or value of an airplane. Personally I would not be dissuaded from buying an airplane with ?damage history? alone provided that the repair was done correctly.
I am sorry that I cannot agree that a stuck valve, broken crankshaft, cracked head, and so on are NOT damage. It is a sorry state of affairs when we accept an engine breaking as ?normal?, but that is the way it is. To me normal wear on an engine would involve wearing out the bearings, rings, cylinder bores, etc. However, back to my original point; it doesn?t make any difference anyway.