ACR LTT GIVEN WAKE TURB ADVISORY BY APCH CTLR ON PRECEDING LGT ACFT. LTT HIT WAKE TURB AND WAS NEARLY UPSET BY THE ENCOUNTER.

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APCHING PITTZ OM AT 3000 FT MSL AND 180 KTS ASSIGNED I WAS GIVEN A WAKE TURB WARNING OF AN LGT Y 3 MI AHEAD. BEFORE THE CTLR FINISHED GIVING THE WARNING MY ACFT ROLLED RAPIDLY INTO A 60 DEG L BANK. ACFT WAS ON AUTOPLT WITH 15 DEGS FLAPS SELECTED. AUTOPLT WAS UNABLE TO STOP ROLL; I TOOK CTL AND IT STILL TOOK SEVERAL SECONDS TO LEVEL THE WINGS AND GET THE NOSE BACK TO THE HORIZON. ALT LOSS WAS 500-700 FT. THE SCARY PART WAS THAT ACFT DID NOT RECOVER IMMEDIATELY AND AFTER I GOT IT RECOVERED; I DID NOT KNOW WHERE OTHER ACFT WAS AND IF I WOULD ENCOUNTER ADDITIONAL WAKE TURB. FLEW REMAINDER OF APCH 1 DOT L AND ENCOUNTERED MINOR WAKE TURB 2 OTHER TIMES DURING THE APCH. ATIS INFO WAS XA29Z -X 12 OVCST 1 1/2 SNOW 26/21 2814 ALTIMETER 29.51. HUMAN FACTORS: FAA ATC PERSONNEL ARE AWARE OF THE LGT Y WAKE TURB PROB AND THAT THE ACFT SHOULD BE CLASSIFIED AS A HVY ACFT AND APPROPRIATE SEPARATION PROVIDED. WARNINGS/SEPARATION MUST BE GIVEN IN TIME FOR CORRECTIVE ACTION TO BE TAKEN AND CTLRS MUST REALIZE THAT IN IMC PLTS HAVE FEW OPTIONS TO AVOID WAKE TURB.