FCC Requi r ement changes or modi f i cat i ons not expr essl y appr oved by t he par t y r esponsi bl e f or compl i ance coul d voi d t he user ’ s aut hor i t y t o oper at e t he equi pment . Thi s devi ce compl i es wi t h Par t 15 of t he FCC Rul es.