Narrative:

After about 1 hour training flight to the practice area, I had performed an incident-free touch-and-go. After a trip around the pattern I planned to land. A 757 was waiting to cross the runway I was landing on. When I was very close to the ground, my aircraft underwent a series of uncommanded yawing motions of about 10-15 degrees and uncommanded roll motions of about 5-10 degrees. These motions concerned me somewhat, and I executed a go around. I landed without further incident. The 757 departed from 19R when I was downwind approximately abeam the numbers. Wind was 3-5 KTS at about 180-200 degrees. I can think of no explanation for the winds that caused the uncommanded yawing oscillations except for winds caused by the jet engine's intakes or 'intake turbulence.' callback conversation with reporter revealed the following information: the reporter cannot be shaken from his notion that intake turbulence caused his rolling and yawing over the end of the runway. Yawing was more pronounced and frightening than rolling. The flight schools at sna teach little aircraft pilots to come over the end of the runway about 50 ft AGL and to land long in an attempt to avoid turbulence and landing short. The reporter could not recall any arriving or departing traffic that might have caused this problem. He agrees that the 757 might have caused the air to burble across the fuselage as it might across a building or tree line.

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Original NASA ASRS Text

Title: AN LGT REPORTS FRIGHTENING TURB AROUND THE NOSE OF A PARKED B-757.

Narrative: AFTER ABOUT 1 HR TRAINING FLT TO THE PRACTICE AREA, I HAD PERFORMED AN INCIDENT-FREE TOUCH-AND-GO. AFTER A TRIP AROUND THE PATTERN I PLANNED TO LAND. A 757 WAS WAITING TO CROSS THE RWY I WAS LNDG ON. WHEN I WAS VERY CLOSE TO THE GND, MY ACFT UNDERWENT A SERIES OF UNCOMMANDED YAWING MOTIONS OF ABOUT 10-15 DEGS AND UNCOMMANDED ROLL MOTIONS OF ABOUT 5-10 DEGS. THESE MOTIONS CONCERNED ME SOMEWHAT, AND I EXECUTED A GAR. I LANDED WITHOUT FURTHER INCIDENT. THE 757 DEPARTED FROM 19R WHEN I WAS DOWNWIND APPROX ABEAM THE NUMBERS. WIND WAS 3-5 KTS AT ABOUT 180-200 DEGS. I CAN THINK OF NO EXPLANATION FOR THE WINDS THAT CAUSED THE UNCOMMANDED YAWING OSCILLATIONS EXCEPT FOR WINDS CAUSED BY THE JET ENG'S INTAKES OR 'INTAKE TURB.' CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR CANNOT BE SHAKEN FROM HIS NOTION THAT INTAKE TURB CAUSED HIS ROLLING AND YAWING OVER THE END OF THE RWY. YAWING WAS MORE PRONOUNCED AND FRIGHTENING THAN ROLLING. THE FLT SCHOOLS AT SNA TEACH LITTLE ACFT PLTS TO COME OVER THE END OF THE RWY ABOUT 50 FT AGL AND TO LAND LONG IN AN ATTEMPT TO AVOID TURB AND LNDG SHORT. THE RPTR COULD NOT RECALL ANY ARRIVING OR DEPARTING TFC THAT MIGHT HAVE CAUSED THIS PROB. HE AGREES THAT THE 757 MIGHT HAVE CAUSED THE AIR TO BURBLE ACROSS THE FUSELAGE AS IT MIGHT ACROSS A BUILDING OR TREE LINE.

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.