Narrative:

C402B 9 passenger 1 pilot 6000 pounds (6200 ft maximum landing weight) center gravity -- 159.7, aft limit 160.1. Las ATIS arrival information 110 degrees fahrenheit, 43 degrees dewpoint, wind 1509, altimeter 29.78. I was cleared for a flamingo approach runway 19R (which is a left base leading to a 1 1/2 mi final). At 10 DME, 5000 MSL, 160 KTS, I was advised of traffic, 10 O'clock, 6000 ft MSL, descending agr 757 northbound on downwind to runway 19L. I reported traffic sighted and would maintain visual separation. Approach then cleared me to the showboat (about a 15 degree right turn leading to a 4 1/2 mi final), 6 mi from present position. 3 mi from showboat, now at 4000 ft MSL plus 150 KTS, approach cleared me direct to runway 19R and issued TA update 757 12 O'clock 4500 ft MSL turning left to runway 19L. Direct to runway 19R would bring me through, and below, his flight path twice, so I requested to stay wider and outside his turn. This was approved. At this time the 757 entered a rapid descent for landing, quickly going below my altitude. I flew over the showboat at 3500 ft MSL, 150 KTS, 10 degree flaps, turned 10 degrees left to parallel charleston blvd, and remain clear of nellis airspace. It is only 1 mi between the showboat and the extended centerline of runway 19R. On this segment I descended to 3200 ft MSL (1000 AGL) lowered landing gear, slowed to 135 KTS, flew past final by about 1/2 mi for more space. As I began left turn to final I noticed the 757 had overshot final slightly. He was now 2 mi ahead of me and lower, on final to runway 19L. I rolled level, tracking 180 degrees to the numbers of runway 19R, with nearly 10 degrees additional correction for wind. Aircraft was then rolled to a 60 degree left bank 20 degrees nose down. I used large control deflections to return to level flight, remained above VASI, and made a normal landing. I must have descended into his glide path as I turned final, which he overshot towards my runway, and a 10 KT east wind brought his vortex to me. During my last 8 mi to the runway remained above him, but not his glide path. I was descending at this time and was tricked by the illusion.

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Original NASA ASRS Text

Title: RPTR IN CESSNA 402 ENCOUNTERED WAKE TURB FROM BOEING 757 ABOUT 2 MI AHEAD LNDG ON ADJACENT RWY.

Narrative: C402B 9 PAX 1 PLT 6000 LBS (6200 FT MAX LNDG WT) CTR GRAVITY -- 159.7, AFT LIMIT 160.1. LAS ATIS ARR INFO 110 DEGS FAHRENHEIT, 43 DEGS DEWPOINT, WIND 1509, ALTIMETER 29.78. I WAS CLRED FOR A FLAMINGO APCH RWY 19R (WHICH IS A L BASE LEADING TO A 1 1/2 MI FINAL). AT 10 DME, 5000 MSL, 160 KTS, I WAS ADVISED OF TFC, 10 O'CLOCK, 6000 FT MSL, DSNDING AGR 757 NBOUND ON DOWNWIND TO RWY 19L. I RPTED TFC SIGHTED AND WOULD MAINTAIN VISUAL SEPARATION. APCH THEN CLRED ME TO THE SHOWBOAT (ABOUT A 15 DEG R TURN LEADING TO A 4 1/2 MI FINAL), 6 MI FROM PRESENT POS. 3 MI FROM SHOWBOAT, NOW AT 4000 FT MSL PLUS 150 KTS, APCH CLRED ME DIRECT TO RWY 19R AND ISSUED TA UPDATE 757 12 O'CLOCK 4500 FT MSL TURNING L TO RWY 19L. DIRECT TO RWY 19R WOULD BRING ME THROUGH, AND BELOW, HIS FLT PATH TWICE, SO I REQUESTED TO STAY WIDER AND OUTSIDE HIS TURN. THIS WAS APPROVED. AT THIS TIME THE 757 ENTERED A RAPID DSCNT FOR LNDG, QUICKLY GOING BELOW MY ALT. I FLEW OVER THE SHOWBOAT AT 3500 FT MSL, 150 KTS, 10 DEG FLAPS, TURNED 10 DEGS L TO PARALLEL CHARLESTON BLVD, AND REMAIN CLR OF NELLIS AIRSPACE. IT IS ONLY 1 MI BTWN THE SHOWBOAT AND THE EXTENDED CTRLINE OF RWY 19R. ON THIS SEGMENT I DSNDED TO 3200 FT MSL (1000 AGL) LOWERED LNDG GEAR, SLOWED TO 135 KTS, FLEW PAST FINAL BY ABOUT 1/2 MI FOR MORE SPACE. AS I BEGAN L TURN TO FINAL I NOTICED THE 757 HAD OVERSHOT FINAL SLIGHTLY. HE WAS NOW 2 MI AHEAD OF ME AND LOWER, ON FINAL TO RWY 19L. I ROLLED LEVEL, TRACKING 180 DEGS TO THE NUMBERS OF RWY 19R, WITH NEARLY 10 DEGS ADDITIONAL CORRECTION FOR WIND. ACFT WAS THEN ROLLED TO A 60 DEG L BANK 20 DEGS NOSE DOWN. I USED LARGE CTL DEFLECTIONS TO RETURN TO LEVEL FLT, REMAINED ABOVE VASI, AND MADE A NORMAL LNDG. I MUST HAVE DSNDED INTO HIS GLIDE PATH AS I TURNED FINAL, WHICH HE OVERSHOT TOWARDS MY RWY, AND A 10 KT E WIND BROUGHT HIS VORTEX TO ME. DURING MY LAST 8 MI TO THE RWY REMAINED ABOVE HIM, BUT NOT HIS GLIDE PATH. I WAS DSNDING AT THIS TIME AND WAS TRICKED BY THE ILLUSION.

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.