As the result of the accidents due to wind shear and other weather disturbances , most notably the 1985 crash of Delta Air Lines Flight 191 , the U.S. Federal Aviation Administration mandated that all commercial aircraft have on-board wind shear detection systems by 1993 . Since 1995 , the number of major civil aircraft accidents caused by wind shear has dropped to approximately one every ten years , due to the mandated on-board detection as well as the addition of Doppler weather radar units on the ground ( NEXRAD ) . The installation of high-resolution Terminal Doppler Weather Radar stations at many U.S. airports that are commonly affected by wind shear has further aided the ability of pilots and ground controllers to avoid wind shear conditions
Delta Air Lines Flight 191
Delta Air Lines Flight 191
Aviation safety