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Thanks for that.
And good point. I'll have to go back to see if there was anything about the penetrant test. I was aware of that, but don't recall seeing any entries about it. Also don't see any reference to compliance.
I'm also inclined to agree about operations specific to photography. I can't imagine that anyone would last very long staring through a lens while the pilot was working the elevators hard. And while photography might involve the elevated Gs associated with circling, it isn't cyclical, nor extreme. I'm not an engineer by trade, but I recall well from my engineering classes that Aluminum is not pleased by cyclical stress, whereas static load is not so much an issue.
Still curious as to the costs. I'm only 700 hours away from the maintenance program prescribed for all serials thru 1852.
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