Narrative:

Air carrier X on approach, first officer flying, 5 mi in trail with a B757, our aircraft rolled left. First officer responded with nearly full opposite aileron and returned aircraft to level flight. Approximately 1 second later, vortex was re-encountered with aircraft again rolling left. I assisted first officer in applying full opposite aileron, but was unable to stop roll. Full power was applied and a missed approach was initiated. We returned for an uneventful landing. There were no reported injuries though the flight attendant, who was seated in the flight attendant's aft facing jumpseat with 4 point harness attached, was thrown against side wall of cabin by the roll. No damage to aircraft was discovered. As a local safety chairman for our airline, I was responsible for distributing the advisory letter from the FAA administrator regarding wake turbulence from b- 757's and was very aware of the hazard. On this particular approach, when I saw the 757 make a visual right base entry ahead of us, I discussed the possibility of wake from the aircraft. We confirmed tower's advisory of '5 in trail' with our TCASII display. Unfortunately, since we were on dissimilar approachs to a common runway, it was impossible to plot his flight path and adjust ours accordingly. It should be noted that on ILS's, we've had less than 5 mi separation following 757's with no problems. I can only assume that our approach altitude was lower than his. Contributing to the problem was that the tower was reporting calm winds.

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Original NASA ASRS Text

Title: ACR X LOSS OF ACFT CTL DUE TO B757 WAKE TURB.

Narrative: ACR X ON APCH, FO FLYING, 5 MI IN TRAIL WITH A B757, OUR ACFT ROLLED L. FO RESPONDED WITH NEARLY FULL OPPOSITE AILERON AND RETURNED ACFT TO LEVEL FLT. APPROX 1 SECOND LATER, VORTEX WAS RE-ENCOUNTERED WITH ACFT AGAIN ROLLING L. I ASSISTED FO IN APPLYING FULL OPPOSITE AILERON, BUT WAS UNABLE TO STOP ROLL. FULL PWR WAS APPLIED AND A MISSED APCH WAS INITIATED. WE RETURNED FOR AN UNEVENTFUL LNDG. THERE WERE NO RPTED INJURIES THOUGH THE FLT ATTENDANT, WHO WAS SEATED IN THE FLT ATTENDANT'S AFT FACING JUMPSEAT WITH 4 POINT HARNESS ATTACHED, WAS THROWN AGAINST SIDE WALL OF CABIN BY THE ROLL. NO DAMAGE TO ACFT WAS DISCOVERED. AS A LCL SAFETY CHAIRMAN FOR OUR AIRLINE, I WAS RESPONSIBLE FOR DISTRIBUTING THE ADVISORY LETTER FROM THE FAA ADMINISTRATOR REGARDING WAKE TURB FROM B- 757'S AND WAS VERY AWARE OF THE HAZARD. ON THIS PARTICULAR APCH, WHEN I SAW THE 757 MAKE A VISUAL R BASE ENTRY AHEAD OF US, I DISCUSSED THE POSSIBILITY OF WAKE FROM THE ACFT. WE CONFIRMED TWR'S ADVISORY OF '5 IN TRAIL' WITH OUR TCASII DISPLAY. UNFORTUNATELY, SINCE WE WERE ON DISSIMILAR APCHS TO A COMMON RWY, IT WAS IMPOSSIBLE TO PLOT HIS FLT PATH AND ADJUST OURS ACCORDINGLY. IT SHOULD BE NOTED THAT ON ILS'S, WE'VE HAD LESS THAN 5 MI SEPARATION FOLLOWING 757'S WITH NO PROBS. I CAN ONLY ASSUME THAT OUR APCH ALT WAS LOWER THAN HIS. CONTRIBUTING TO THE PROB WAS THAT THE TWR WAS RPTING CALM WINDS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.