Narrative:

Being vectored for the ILS runway 19R sna, heading 090 degrees, we were advised of traffic. PNF (right seat) responded 'we'll be looking.' however, we were IMC -- solid. Seconds later PNF pointed to the left saying, 'look at that airplane!' I glanced l-hand side and spotted a cessna 150 passing off our l-hand side from front to rear, approximately heading 240 degrees, 200 ft horizontal. Our altitude (exactly 3000 ft) in the clouds. We reported this event to ATC. Just a few seconds later, PNF called 'localizer alive.' at about this time as we were intercepting the localizer I told the approach controller I would like to file a near miss report. We were given a phone number for the supervisor on duty at socal approach and I spoke with him approximately 45 mins later. I was told they had followed the other aircraft to lgb, spoke with the pilot who said she, a 30 yr FAA pilot examiner, had us in sight and there was no problem! The supervisor said they had lost radar contact with this airplane momentarily, so maybe they followed the wrong airplane to lgb. Question if it was the wrong airplane, why did she say she saw us? Supplemental information from acn 304248: socal approach called me after landing. Mr. X at socal said a citation on an approach to sna complained about a near miss with my aircraft. I saw the citation from the time he broke out until he intercepted the ILS for sna north of snake and outside the class C airspace. No evasive action was needed. I estimated my distance more than 2 mi from him. Socal gave me as traffic to the citation as 11 O'clock and 2 mi. This class east airspace north of sna is congested.

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Original NASA ASRS Text

Title: POSSIBLE NMAC.

Narrative: BEING VECTORED FOR THE ILS RWY 19R SNA, HDG 090 DEGS, WE WERE ADVISED OF TFC. PNF (R SEAT) RESPONDED 'WE'LL BE LOOKING.' HOWEVER, WE WERE IMC -- SOLID. SECONDS LATER PNF POINTED TO THE L SAYING, 'LOOK AT THAT AIRPLANE!' I GLANCED L-HAND SIDE AND SPOTTED A CESSNA 150 PASSING OFF OUR L-HAND SIDE FROM FRONT TO REAR, APPROX HDG 240 DEGS, 200 FT HORIZ. OUR ALT (EXACTLY 3000 FT) IN THE CLOUDS. WE RPTED THIS EVENT TO ATC. JUST A FEW SECONDS LATER, PNF CALLED 'LOC ALIVE.' AT ABOUT THIS TIME AS WE WERE INTERCEPTING THE LOC I TOLD THE APCH CTLR I WOULD LIKE TO FILE A NEAR MISS RPT. WE WERE GIVEN A PHONE NUMBER FOR THE SUPVR ON DUTY AT SOCAL APCH AND I SPOKE WITH HIM APPROX 45 MINS LATER. I WAS TOLD THEY HAD FOLLOWED THE OTHER ACFT TO LGB, SPOKE WITH THE PLT WHO SAID SHE, A 30 YR FAA PLT EXAMINER, HAD US IN SIGHT AND THERE WAS NO PROB! THE SUPVR SAID THEY HAD LOST RADAR CONTACT WITH THIS AIRPLANE MOMENTARILY, SO MAYBE THEY FOLLOWED THE WRONG AIRPLANE TO LGB. QUESTION IF IT WAS THE WRONG AIRPLANE, WHY DID SHE SAY SHE SAW US? SUPPLEMENTAL INFO FROM ACN 304248: SOCAL APCH CALLED ME AFTER LNDG. MR. X AT SOCAL SAID A CITATION ON AN APCH TO SNA COMPLAINED ABOUT A NEAR MISS WITH MY ACFT. I SAW THE CITATION FROM THE TIME HE BROKE OUT UNTIL HE INTERCEPTED THE ILS FOR SNA N OF SNAKE AND OUTSIDE THE CLASS C AIRSPACE. NO EVASIVE ACTION WAS NEEDED. I ESTIMATED MY DISTANCE MORE THAN 2 MI FROM HIM. SOCAL GAVE ME AS TFC TO THE CITATION AS 11 O'CLOCK AND 2 MI. THIS CLASS E AIRSPACE N OF SNA IS CONGESTED.

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.