One of the ideas behind slowing down to penetrate turbulence is to avoid stressing or breaking the airframe. Depending on the turbulence-wind gusts, not necessarily in the horizontal plane-can change the wings angle of attack abruptly, create airframe loads. Consider the wing depicted below, in smooth, level air (no gusts) and a relatively low angle of attack (AoA-the angle between the chord line and the relative wind):
Now, consider this wing, also in level flight but encountering a strong upward wind gust, say 50 feet/sec., or 30 knots:
