Rust never sleeps
Over they years whenever I've had a chance to talk to folks who worked at Beech and Cessna and the other aircraft companies, I always asked them what time frame they designed these single-engine planes and light twins for. Of course they always tend to not want to be specific, probably since they didn't really know, but I'm sure it was not for even half the number of years and hours the typical GA fleet plane has on it now.
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