1 definition by bzrgeezer

PIO

Pilot Induced Oscillation. New pilots are often too abrupt on the controls causing an overshoot of the desired altitude or airspeed followed by hasty over correction trying to maintain a desired state. This results in a porpoise like undulation.

Avoid a PIO by applying small control inputs slowly over time. Don't "saw" the controls.

by bzrgeezer July 2, 2020