In-flight aircraft jerks around and changes speed

Next time you fly, select the data display. [press Shift-Z once] This gives you the first line of data, in red text, at the top of the screen. The end of this line shows the wind direction and speed. Then, when you experience the "violent jerking and speed drop" check to see if there was a sudden change in wind direction and speed. You can pause the flite and use instant replay to see what happened.

CP ASMEL Instruments