I don't know what you're referencing and planes aren't really my specialty, but personally, I'm fascinated by the whole concept of the Instrument Landing System.

Unfortunately, I don't think I have the technical understanding to confidently explain how it works, but it's using the modulation of different radio frequencies and the ways they cancel out to indicate to pilots whether they're correctly facing and approaching the runway. If the plane isn't in the right approach path, certain side frequencies will come out stronger and can be used to determine the exact angle you're off.

It's friggin' fascinating.

Anyway, were you referring to a specific part or just seeing if I can also nerd out about some other random topic?