We had a Skyhawk get an engine modification and it needed 10+ hours of high-RPM operation. Normally, that's accomplished with longer cross-country flights as it keeps the RPMs high and minimizes 'slow-downs' for patterns. I finished 7548G's required hours but it was a race against the sun. I'd rather not fly an unknown engine in the dark. In fact, my luster for flying any single-engine in the dark has waned. As I say, I like to see where I need to land. Only the last hour was in the dark, so it was okay.
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