Yes indeed the final track is 30 different than IF. But if you arm the approach after IF it will be armed and if you get on final track before FAF it will get active provided you are at FAF altitude before the FAF. You are allowed to do direct to FAF also provided the turn after FAF is not sharp. FINALAPP will engage but descent may take place outside protected path after FAF.
Last edited by vilas; 3rd Jun 2016 at 16:10.