Wind shear is a rapid change in either wind speed or wind direction over a short period of time or distance. Wind shear can describe the changes either horizontally (along the Earth’s surface) or vertically. How much wind shear change can impact a plane? For a smaller plane a change of 25 to 30 knots might be enough to cause issues. This can certainly contribute to a potential airplane accidents. If you have questions on other forensic aviation issues or just need information you can find some answers here http://www.aviationweatherlaw.com/ or you can contact Aviation Weather Law