Jay Honeck writes:

Pilot Induced Oscillation. It's usually something that happens during
the landing flare, but can happen on a short-coupled aircraft in any
phase of flight.

Like the book _Airframe_. I guess I should have remembered it.

I wasn't aware that a Bonanza was in that category, but apparently it is.

I've read about phugoid (what a bizarre word!) oscillations, both
pilot-induced and otherwise, and apparently they are universal to some
degree. When I first encountered these in simulation, I thought it
was an artifact of the simulation.

Planes are built to handle it.

Well, a 737 can handle only 2.5 Gs. That's not a very wide margin of
safety.

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