The NTSB report noted that between 1970 and 1973, seven separate cases involving a single leading edge slat extension and separation were reported, but none of these reports indicated whether or not the slat extension was due to flight crew involvement. Records after 1974 did include this information, and (other than Flight 174) only two slat extension problems were reported between 1974 and the close of the NTSB's investigation in 1981, one of which was inadvertently caused by the flight crew. However, in none of these previous cases did the plane become uncontrollable.
The NTSB report documented seven separate incidents involving a single leading edge slat extension and separation between 1970 and 1973, but none of these reports specified if the slat extension was due to flight crew involvement. Records after 1974 included this information, and (except for Flight 174) only two slat extension problems were reported between 1974 and the NTSB's investigation in 1981, with one of them being unintentionally caused by the flight crew. However, in none of these previous cases did the aircraft become uncontrollable.