WAKE TURB ENCOUNTER BEHIND 757 LNDG ON PARALLEL RWY.

Narrative

STRONG WAKE TURB FOLLOWING B757 ON VISUAL APCH TO SFO; REQUIRED FULL AILERON TO MAINTAIN CTL. POS -- INBOUND Q B APCH SFO RWY 28R. 095 DEG RADIAL SFO AT OR ABOVE PROFILE ABOUT 18 DME. ALT 7000-6000 FT DSNDING; 160 KIAS ASSIGNED; FLAPS 15 DEGS; NICE DAY; WORKLOAD LOW. WX -- CLR; VISIBILITY 20 PLUS; ATIS WIND CALM. EVENT -- WITH B757 ON TIP TOE APCH TO RWY 28L. 5-7 MI AHEAD; ACFT BEGAN A MODERATE RATE ROLL (CANNOT RECALL DIRECTION) REQUIRING FULL AILERON INPUT TO CTL ACFT ROLL. ACFT CONTINUED TO ROLL. LARGE THRUST INCREASE APPLIED; SOME RUDDER AND LEVELED OFF. REGAINED IMMEDIATE CTL. REQUESTED AND RECEIVED APPROVAL FOR S TURNS. CHK TWR WINDS (140/ABOUT 6 KTS). REQUESTED RWY 28L (UPWIND) AND LANDED. HAD AVIATION SAFETY INSPECTION (AIRWORTHINESS). AFTER LNDG: ADVISED BAT TRACON TO 1) DESCRIBE SIT AND S TURNS AND RWY 28L REQUEST. 2) RE-EMPHASIZE PLTS CONCERNS REGARDING B757 WAKE TURB. 3) SUGGEST STAGGERING APCH ACFT SO THAT ACFT IMMEDIATELY FOLLOWING B757 IS ON THE UPWIND SIDE. SUGGESTIONS: 1) INVOLVE ATC MORE REGARDING OUR DESIRE TO BE UPWIND (THIS INCIDENT ATIS RPT CALM BUT TWR RPT 140/6 KTS) B-757. 2) RE-EVALUATE AIM FOR CRITERIA FOR WAKE TURB SEPARATION. WE WERE NEVER CLOSER THAN 5 MI ON TCASII.