So when at a low RPM setting in situations like taxing and landing descent, I've noticed that placing N1 at around 75 -80 percent causes a weird RPM fluctuation that goes between 70 and 80 percent RPM and it just bounces back and forth at a moderate rate. Is this a correct modelling of the engine characteristics because I'm very sure it's unlikely to be engine surging as I have checked the manuals and no symptoms arise. Any L39 pilots care to take a jab at this question?
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