Windshears are most dangerous during takeoff and landing. In these instances, the windshear occurs at low altitudes resulting from topographical conditions, temperature inversions, sea breezes, frontal systems, surface winds, thunderstorms, and rain showers.

When a plane encounters a windshear right after liftoff, the takeoff appears normal during the first few seconds. Suddenly, there is an airspeed decrease, the plane loses altitude, and the plane's nose drops. The plane will crash unless corrective action is taken immediately. This can occur within 20 seconds after takeoff. If a windshear is encountered, apply full power or thrust to increase the airflow over the wing tips.

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Curator: Tom.Benson@grc.nasa.gov
Responsible Official: Kathy.Zona@grc.nasa.gov