AN SMA DEPARTS TIJUANA; MEXICO; FLYING VFR TO SDM; CA; BUT FAILS TO RPT TO SAN DIEGO FSS OF HIS BORDER XING.

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I FILED A VFR FLT PLAN WITH THE PROPER AUTHS AT ENSENADA; MEXICO (BAJA; CA) TO BROWN FIELD IN CALIFORNIA (NEAR SAN DIEGO) WITH AN ETE OF 25 MINS. ONCE AIRBORNE; ENSENADA TWR CTL HANDED ME OFF IMMEDIATELY TO TIJUANA APCH CTL. TIJUANA APCH CTL GAVE ME A SQUAWK AND ADVISED ME TO PROCEED TO CROSS OVER TIJUANA ARPT ENRTE TO BROWN FIELD. ABOUT 10 MI FROM TIJUANA ARPT; TIJUANA APCH CTL HANDED ME OFF TO TIJUANA TWR CTL. TIJUANA TWR ADVISED ME TO CROSS OVER TIJUANA ARPT AT 2000 FT MSL AND CONTACT BROWN TWR OVER TIJUANA ARPT. I CONTACTED BROWN TWR OVER TIJUANA ARPT AND WAS TOLD TO CROSS OVER BROWN ARPT AND ENTER R DOWNWIND FOR RWY 26R. I WAS THEN CLRED TO LAND ON RWY 26R. MY ETE OF 25 MINS WAS RIGHT ON. I FORGOT TO CALL SAN DIEGO FSS TO FILE A BORDER XING AFTER AIRBORNE FROM ENSENADA. I KNEW THAT I WAS SUPPOSED TO CALL SAN DIEGO FSS TO FILE A BORDER XING; BUT I WRONGLY ASSUMED THAT BECAUSE I WAS HANDED OFF IMMEDIATELY TO TIJUANA APCH CTL AND GIVEN A SQUAWK; THAT MY BORDER XING WAS AUTOMATICALLY FORWARDED TO SAN DIEGO FSS. CONTRIBUTING FACTOR: IN MY LIFE; I HAD ONLY DONE ONE OTHER BORDER XING ABOUT 3 MONTHS PREVIOUS TO THIS OCCURRENCE AND THAT WAS FROM SAN FELIPE; MEXICO. IN THAT CASE; I WAS NOT HANDED OFF TO AN APCH CTL AND I PROPERLY CALLED SAN DIEGO FSS IN THE AIR AND FILED MY BORDER XING. CORRECTIVE ACTION: BE SURE YOU ARE VERY FAMILIAR WITH THE PROCS OF THE BORDER XING BEFORE YOU ATTEMPT IT! THE FINE COULD BE AS HIGH AS $5000.00!