Narrative:

We were 4-5 mi in trail of a B757 on a visual approach to runway 34 at slc. On short final at approximately 150 ft we encountered wake turbulence. I advanced power to go around power. Aircraft rolled 20 degree left then 20 degree right then we flew out of it. We were still in a position to land in the touchdown zone which we did, landing in the touchdown zone. 2 737-300's also had just crossed when we were less than a mi on final. Callback conversation with reporter revealed the following: the reporter stated he was flying a boeing 727-200. He stated the most significant contributing cause for this wake turbulence incident was lack of spacing behind the 757. The tower should use at least 5 or more mi spacing. He stated the aviation community should investigate more the vortices of specific airplanes. Perhaps winglets would reduce vortices. The only thing he would do differently would be not so close. 4 mi is too close. He did not mention staying above the wake and touching down further on the 12000 ft runway. Ideally there would be 2 runways and the heavies and 757's would use the other runway, he said.

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Original NASA ASRS Text

Title: BOEING 727 FLC ENCOUNTER BOEING 757 WAKE TURB AT 150 FT AGL ON ILS APCH JUST PRIOR TO LNDG.

Narrative: WE WERE 4-5 MI IN TRAIL OF A B757 ON A VISUAL APCH TO RWY 34 AT SLC. ON SHORT FINAL AT APPROX 150 FT WE ENCOUNTERED WAKE TURB. I ADVANCED PWR TO GAR PWR. ACFT ROLLED 20 DEG L THEN 20 DEG R THEN WE FLEW OUT OF IT. WE WERE STILL IN A POS TO LAND IN THE TOUCHDOWN ZONE WHICH WE DID, LNDG IN THE TOUCHDOWN ZONE. 2 737-300'S ALSO HAD JUST CROSSED WHEN WE WERE LESS THAN A MI ON FINAL. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THE RPTR STATED HE WAS FLYING A BOEING 727-200. HE STATED THE MOST SIGNIFICANT CONTRIBUTING CAUSE FOR THIS WAKE TURB INCIDENT WAS LACK OF SPACING BEHIND THE 757. THE TWR SHOULD USE AT LEAST 5 OR MORE MI SPACING. HE STATED THE AVIATION COMMUNITY SHOULD INVESTIGATE MORE THE VORTICES OF SPECIFIC AIRPLANES. PERHAPS WINGLETS WOULD REDUCE VORTICES. THE ONLY THING HE WOULD DO DIFFERENTLY WOULD BE NOT SO CLOSE. 4 MI IS TOO CLOSE. HE DID NOT MENTION STAYING ABOVE THE WAKE AND TOUCHING DOWN FURTHER ON THE 12000 FT RWY. IDEALLY THERE WOULD BE 2 RWYS AND THE HEAVIES AND 757'S WOULD USE THE OTHER RWY, HE SAID.

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.