Narrative:

On jul/sun/95 I was flying a jetstream on approach to (mry) monterey, ca. It was VMC with haze. We were on a left downwind for runway 28L when a C-152 (female, with heavy french accent) also reported left downwind. I immediately became concerned until the tower came right back and corrected her by saying she was on a right downwind and was cleared to land on runway 28R. She responded cleared to land runway 28R. I was still concerned about the C-152 pilot's airmanship so I told my first officer I was going to make a high/short approach to runway 28L to remain well clear of the cessna. We turned base and the cessna reported base within 10 seconds. With the cessna pilot's apparent inexperience I wouldn't have expected her to turn base so soon, but sure enough I spotted her coming directly at us maybe 100 ft below us. From where I saw her I knew she would overshoot both her final (runway 28R) and runway 28L's final by a big margin. My first officer confirmed that she overshot both runways and commented it was a good call to stay high and shoot a short approach otherwise she may have hit us. Doing simultaneous visuals with close proximity parallel runways with various levels of experience is common at mry, fat, and very often at sna. In the future I will not turn base until I see the parallel traffic and know when I'm on final there will be plenty of separation in case of an overshoot. I would recommend that towers demand aircraft have some kind of separation on final to prevent this situation. That is towers who have very low time pilots operating.

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Original NASA ASRS Text

Title: NMAC -- ACR HAS AN NMAC WHEN A LIGHT ACFT OVERSHOOTS ITS FINAL APCH TO A PARALLEL RWY AND FLIES UNDER THE ACR.

Narrative: ON JUL/SUN/95 I WAS FLYING A JETSTREAM ON APCH TO (MRY) MONTEREY, CA. IT WAS VMC WITH HAZE. WE WERE ON A L DOWNWIND FOR RWY 28L WHEN A C-152 (FEMALE, WITH HVY FRENCH ACCENT) ALSO RPTED L DOWNWIND. I IMMEDIATELY BECAME CONCERNED UNTIL THE TWR CAME RIGHT BACK AND CORRECTED HER BY SAYING SHE WAS ON A R DOWNWIND AND WAS CLRED TO LAND ON RWY 28R. SHE RESPONDED CLRED TO LAND RWY 28R. I WAS STILL CONCERNED ABOUT THE C-152 PLT'S AIRMANSHIP SO I TOLD MY FO I WAS GOING TO MAKE A HIGH/SHORT APCH TO RWY 28L TO REMAIN WELL CLR OF THE CESSNA. WE TURNED BASE AND THE CESSNA RPTED BASE WITHIN 10 SECONDS. WITH THE CESSNA PLT'S APPARENT INEXPERIENCE I WOULDN'T HAVE EXPECTED HER TO TURN BASE SO SOON, BUT SURE ENOUGH I SPOTTED HER COMING DIRECTLY AT US MAYBE 100 FT BELOW US. FROM WHERE I SAW HER I KNEW SHE WOULD OVERSHOOT BOTH HER FINAL (RWY 28R) AND RWY 28L'S FINAL BY A BIG MARGIN. MY FO CONFIRMED THAT SHE OVERSHOT BOTH RWYS AND COMMENTED IT WAS A GOOD CALL TO STAY HIGH AND SHOOT A SHORT APCH OTHERWISE SHE MAY HAVE HIT US. DOING SIMULTANEOUS VISUALS WITH CLOSE PROX PARALLEL RWYS WITH VARIOUS LEVELS OF EXPERIENCE IS COMMON AT MRY, FAT, AND VERY OFTEN AT SNA. IN THE FUTURE I WILL NOT TURN BASE UNTIL I SEE THE PARALLEL TFC AND KNOW WHEN I'M ON FINAL THERE WILL BE PLENTY OF SEPARATION IN CASE OF AN OVERSHOOT. I WOULD RECOMMEND THAT TWRS DEMAND ACFT HAVE SOME KIND OF SEPARATION ON FINAL TO PREVENT THIS SIT. THAT IS TWRS WHO HAVE VERY LOW TIME PLTS OPERATING.

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.