ACR MLG LANDED WITHOUT CLRNC. (X)

Narrative

ESTABLISHED ON FINAL APCH FOR AN ILS TRANSITION TO VISUAL APCH AT RWY 9R; MIAMI ARPT. WE WERE BEING VECTORED BEHIND A FOREIGN CARRIER (B707) 'HVY.' THE WINDS WERE CALM AND WE HAD APPROX 6 MI SPACING. THE 707 MAINTAINED APPROX 2000 FT ALT AND CONDUCTED EXTENSIVE COMS WITH THE CTLR AS HE WAS HAVING DIFFICULTY ACQUIRING THE ARPT; ALTHOUGH THE WX WAS CLR. THE 707 EVENTUALLY ACQUIRED THE RWY AND ACCOMPLISHED A RELATIVELY SHORT; STEEP APCH. AS WE APCHED THE GLIDE PATH; WE ENCOUNTERED A SUDDEN ROLL TO APPROX 30 DEG L BANK. I DISENGAGED THE AUTO PLT TO RECOVER. THE ACFT RESPONDED NORMALLY AS THE AUTOPLT WAS DISENGAGED. AFTER A SECOND ENCOUNTER (FLYING MANUALLY) PRODUCING ONLY A MODERATE 'BUMP;' I FLEW SLIGHTLY HIGH ON FINAL. WE ENCOUNTERED THE VORTEX 2 OR 3 MORE TIMES ON FINAL; INCLUDING A MODERATE ONE IN TRANSITION TO LNDG. BECAUSE WE WERE BOTH CONCENTRATING ON THE ENCOUNTERS AND OUR ANTICIPATED REACTIONS TO ANY SIGNIFICANT DISTURBANCE ON FINAL; THE PNF (CAPT) EVIDENTLY DID NOT SWITCH TO TWR. AFTER LNDG AND CLRING THE RWY; WE REALIZED OUR SIT; SWITCHED TO GND AND PROCEEDED WITHOUT FURTHER INCIDENT. I DO NOT RECALL THE CTLR DIRECTING A RADIO CHANGE AND DO NOT RECALL HEARING A LNDG CLRNC. MY CONCENTRATION ON FLYING THE APCH (AND ANTICIPATING ANOTHER VORTEX ENCOUNTER OF THE MAGNITUDE OF THE FIRST ONE) APPARENTLY CONSTITUTED A DISTR I HAD NOT PREVIOUSLY PREPARED FOR. ALTHOUGH WE DID NOT EXPERIENCE A SIT THAT SPECIFICALLY BROKE THE STABILIZED APCH PRINCIPLE; THE ENCOUNTER WAS SIGNIFICANT/VIOLENT ENOUGH TO BREAK UP OUR CONCENTRATION AND EVIDENTLY DISRUPTED OUR CREW COORD. REQUESTING A 360 DEG TURN OR VECTORS FOR ADDITIONAL SEPARATION MAY HAVE ALLOWED ADDITIONAL TIME FOR THE VORTEX TO CLR AND MAY HAVE IMPROVED OUR COORD DURING THE APCH AND LNDG.