CLOSE PROX GA SMT MAKING GAR AS CLRED AND ACR MLG ON VISUAL APCH WITH SHORT TURN ONTO RWY.

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WHILE INBOUND TO SNA FROM TH SE AT ABOUT 1800 FT MSL APCH CTL CLRED US TO 'PELICAN HILL'; A VFR ENTRY POINT AND SWITCHED US TO SNA TWR 119.9 FOR LNDG ON RWY 19L. TWR CLRED US TO ENTER L TFC FOR 19L THEN LIMITED OUR DSCNT TO 1500 FT MSL AND CLRED US TO CROSS MIDFIELD (WBOUND) FOR R TFC 19R AND TO CONTACT TWR ON 126.8. ON 126.8 WE WERE CLRED TO CROSS MIDFIELD NOT BELOW 1000 FT MSL TO ENTER R DOWNWIND; WHILE ON R DOWNWIND FOR RWY 19R WE WERE CLRED TO LAND #2 BEHIND AN SMA STRAIGHT IN TO 19R WHEN ABOUT 1 MI BEYOND ABEAM THE LNDG POINT ON DOWNWIND THE SMA WAS CLRED TO LAND ON RWY 19L AND WE WERE CLRED #1 ON 19R BEHIND AN AIRLINER CLRED FOR TKOF. WE TURNED R TO LINE UP ON 19R AND AS SOON AS WE ROLLED WINGS LEVEL ON FINAL (APPROX 2 MI) WE WERE TOLD BY SNA TWR 'MIN TIME ON THE RWY; MLG X AT 5 MI TO FOLLOW.' ALMOST IMMEDIATELY WE WERE TOLD TO 'GAR'; WE STARTED AN IMMEDIATE CLB AND WERE TOLD TO TURN R DOWNWIND FOR LNDG. I ASKED 'NOW?' THE TWR SAID 'TURN NOW!' AND WE TURNED R FOR LNDG. AS WE ROLLED INTO OUR TURN I SAW AN ACR (FLT MLG Y) SLIGHTLY BELOW (30 FT) AND INSIDE OUR TURN (50 FT) IN A R BANK. HE PASSED INSIDE TO THE R. AT NO TIME DID THE TWR ADVISE US OF THE CLOSE PROX OF THE MLG Y OR OF A POSSIBLE MID AIR CONFLICT. AFTER LNDG AND TAXI TO FBO AVIATION I CALLED SNA TWR AND TALKED TO ACTING TWR SUPVR. I ASKED HIM WHAT HAPPENED AND HE TOLD ME OF THE CONFLICT AS I DESCRIBED IT AND APOLOGIZED PROFUSELY FOR THE UNSAFE SITUATION WHICH ENSUED. I ASKED HIM IF TWR RADAR SHOWED OUR MERGING TRACKS AND HE TOLD ME HE THOUGHT WE HAD ABOUT 2 1/4 MI SEPARATION FROM THE MLG Y. I ASKED HIM IF ANY ALERT WAS GIVEN FOR 2 POSSIBLE CONFLICTS AND HE SAID NO. I CONTACTED THE CAPT AND FO OF MLG Y AND THEY SAID THAT THEY WERE CLRED BY APCH CTL FOR A VISUAL APCH (FROM THE R) #2 TO FOLLOW AN SMA ON FINAL FOR 19R. THEY FLEW A TIGHT APCH WELL BEHIND THE SMA. ON TWR FREQ THEY HEARD THE INSTRUCTIONS FOR ME TO GAR BUT WERE NOT AWARE OF MY POS. THEY SAW A CLBING ACFT WELL AHEAD (AN AIRLINER PREVIOUSLY CLRED TO TKOF ON RWY 19R) AND ASSUMED IT TO BE US. WHEN WE STARTED OUR R TURN TO DOWNWIND THE MLG Y CREW SAW US FOR THE FIRST TIME AND STARTED AN IMMEDIATE EVASIVE TURN TO THE R. SUPPLEMENTAL INFO FROM ACN 198554. TWR SHOULD ADVISE BOTH ACFT OF THE IMPENDING TFC CONFLICT. APCH CTL AND TWR SHOULD HAVE BEEN IN BETTER COORD OF TFC HDOFS. AIRLINERS SHOULD NOT BE ALLOWED TO FLY CLOSE-IN/SHORT VISUAL APCHS AT ORANGE CO/SNA. SUPPLEMENTAL INFO FROM ACN 199235. MLG BECAME INVOLVED BY NOT HAVING THE CORRECT TFC IN SIGHT AND BY NOT FOLLOWING CTLR INSTRUCTIONS AND TURNING A 3 MI FINAL. FACILITY HAVING A LOA WITH THE RADAR FACILITY FOR EARLY TURN ONS WITHOUT COORD WITH THE LCL CTLR.