Narrative:

Time: XA00Z. ATC frequency: 126.55. ATC facility: dfw tower. Location: visual approach runway 17R. ILS being used. Cleared visual approach runway 17C 8 mi behind B757. Requested and reclred visual for runway 17R. 6 1/2 mi behind B757 and at 1200 ft encountered wake turbulence. Nose pitched up 5 degrees, then mushed out, then pitched down 10 degrees. Aircraft started slow roll to the left. First officer (flying) applied rudder and power to regain control. Required full right rudder and maximum continuous thrust. Roll finally stopped at 40 degrees left bank. Aircraft was flown out of wake. Stayed high on GS and continued approach cautiously. No other indications encountered. Landed normally. Made brief explanation to passenger on the ground, which they appreciated. Callback conversation with reporter revealed the following information: this reporter participated in the wake turbulence structured callback. Reporter was aware he was following the B757 going to the center runway. He had just been moved over to the right runway but neglected to take into account the left crosswind was blowing the wake over to his flight path. He encountered a sharp yaw first, followed by other g-forces with a pitch change. He and his first officer, who was flying the aircraft, added much more rudder and aileron in the opposite direction of the roll caused by the wake and gained rapid control of the aircraft. Once control of the aircraft was established they flew higher and above the GS landing farther down the runway just to avoid any wake. Passenger suffered some trauma from this event, evidenced that several had urinated in their seats. There were no injuries, however, from this event. Event was classified as almost severe and it lasted approximately 6-7 seconds.

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Original NASA ASRS Text

Title: WAKE TURB FROM PROCEEDING B757.

Narrative: TIME: XA00Z. ATC FREQ: 126.55. ATC FACILITY: DFW TWR. LOCATION: VISUAL APCH RWY 17R. ILS BEING USED. CLRED VISUAL APCH RWY 17C 8 MI BEHIND B757. REQUESTED AND RECLRED VISUAL FOR RWY 17R. 6 1/2 MI BEHIND B757 AND AT 1200 FT ENCOUNTERED WAKE TURB. NOSE PITCHED UP 5 DEGS, THEN MUSHED OUT, THEN PITCHED DOWN 10 DEGS. ACFT STARTED SLOW ROLL TO THE L. FO (FLYING) APPLIED RUDDER AND PWR TO REGAIN CTL. REQUIRED FULL R RUDDER AND MAX CONTINUOUS THRUST. ROLL FINALLY STOPPED AT 40 DEGS L BANK. ACFT WAS FLOWN OUT OF WAKE. STAYED HIGH ON GS AND CONTINUED APCH CAUTIOUSLY. NO OTHER INDICATIONS ENCOUNTERED. LANDED NORMALLY. MADE BRIEF EXPLANATION TO PAX ON THE GND, WHICH THEY APPRECIATED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS RPTR PARTICIPATED IN THE WAKE TURB STRUCTURED CALLBACK. RPTR WAS AWARE HE WAS FOLLOWING THE B757 GOING TO THE CTR RWY. HE HAD JUST BEEN MOVED OVER TO THE R RWY BUT NEGLECTED TO TAKE INTO ACCOUNT THE L XWIND WAS BLOWING THE WAKE OVER TO HIS FLT PATH. HE ENCOUNTERED A SHARP YAW FIRST, FOLLOWED BY OTHER G-FORCES WITH A PITCH CHANGE. HE AND HIS FO, WHO WAS FLYING THE ACFT, ADDED MUCH MORE RUDDER AND AILERON IN THE OPPOSITE DIRECTION OF THE ROLL CAUSED BY THE WAKE AND GAINED RAPID CTL OF THE ACFT. ONCE CTL OF THE ACFT WAS ESTABLISHED THEY FLEW HIGHER AND ABOVE THE GS LNDG FARTHER DOWN THE RWY JUST TO AVOID ANY WAKE. PAX SUFFERED SOME TRAUMA FROM THIS EVENT, EVIDENCED THAT SEVERAL HAD URINATED IN THEIR SEATS. THERE WERE NO INJURIES, HOWEVER, FROM THIS EVENT. EVENT WAS CLASSIFIED AS ALMOST SEVERE AND IT LASTED APPROX 6-7 SECONDS.

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.