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The rule works only to the extent that self-preservation motivates pilots to follow it. I imagine enforcement is otherwise difficult. It does appear you can zig-zag vertically indefinitely - that may actually have some statistical safety enhancement since it would presumably lower your time-averaged collision cross-section with aircraft in level flight. But it would increase the collision cross-section with aircraft that are also ascending and descending - though the increase would probably be comparatively lower.


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