Forgot to put the fx files in for the lights, startup and smoke for the plane...
Just put the jetsmoke file in your FSxxxx/Effects folder. Unzip the Posky 747 effects folder and put all those files in the same folder (FSxxxx/Effects).Copy the aircraft.cfg over to the BA Landor 747 folder and overwrite the original if you want exhaust smoke. Press the 'I' key for that.