FLC OF MLG FOLLOWING AN LGT ON APCH FOR LNDG 3 PT 5 MI IN TRAIL; FLEW HIGH AS AWARE OF POSSIBLE WAKE TURB. 50 FT AGL ENCOUNTERED STRONG WAKE TURB. ACFT MOMENTARILY OUT OF CTL; FULL THRUST; FULL AILERON RECOVERY; GAR.

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AS CAPT AND PF I WAS VECTORED FOR PARALLEL VISUAL ORD USING 14L AND 14R. WAS CLRED FOR VISUAL. I WAS FLYING GS DOWN. EXPERIENCED MORE WAKE TURB FROM PRECEDING ACFT THAN WAS USUAL. TCASII SHOWED ABOUT 3.5 MI BEHIND. I ELECTED TO FLY ABOUT 1 DOT HIGH AND STAY OUT OF HIS WAKE AND TO LAND PAST HIS TOUCHDOWN POINT. AIR WAS FAIRLY SMOOTH AT 1 DOT HIGH. SAW MY INNER MARKER LIGHT FLASH AND THEN EXTINGUISH; WAS NOW 1/2 DOT HIGH. AT APPROX 50 FT AGL ACFT ROLLED RAPIDLY R THEN VIOLENTLY L. COUNTERED WITH FULL R AILERON. ACFT CONTINUED L ROLL. WENT TO MAX PWR THEN FIREWALL PWR. WE ACCELERATED THROUGH WAKE ZONE. ON GAR TWR ADVISED OF CONFLICTING TFC THAT HAD DEPARTED 22L. WE HAD A VISUAL ON HIM AND TCASII NEVER ISSUED ANY ADVISORY. I DID NOT CONSIDER HIM A THREAT AT HE WAS IN EXCESS OF 3 MI. NEVER IN 27 YRS HAVE I EXPERIENCED SUCH WAKE TURB. ACFT WE WERE FOLLOWING WAS LGT. WE ARE MLG. FOR A PERIOD OF A COUPLE SECONDS MY ACFT WAS OUT OF CTL DUE TO THE SEVERITY OF WAKE. NO RECOMMENDATIONS AS I SAID 3.5 IN TRAIL. WIND WAS 170 DEG/7.