NMAC BTWN 2 LIGHT SINGLES AT SDM.

Narrative

THE FOLLOWING RPT IS ABOUT AN INFLT NEAR-MISS BTWN 2 SINGLE ENG ACFT AT BROWN FIELD ARPT; SAN DIEGO; CA. I WAS FLYING IN THE PATTERN AT BROWN FIELD DOING TOUCH AND GOES WITH MY INSTRUCTOR. I WAS DEMONSTRATING A SHORT FIELD LNDG WITH A 50 FT OBSTACLE. AS I PREPARED THE ACFT FOR THE LNDG; BROWN TWR CLRED US FOR A TOUCH AND GO ON RWY 26R. ON FINAL APCH TO RWY 26R; INSTRUCTOR AND I WERE MAKING FINAL LNDG CHKS; GEAR; PWR SETTINGS; FLAPS AND AIRSPD. ALL WAS WELL. AT APPROX 50 FT ABOVE THE GND; PASSING THE RWY NUMBERS; I SAW AN AIRPLANE DIRECTLY BELOW MY ACFT. I INITIATED A GAR AND AVOIDED A COLLISION BEFORE TWR CALLED FOR A GAR. TO AVOID A COLLISION WITH THE GRUMMAN TIGER Y; I PERFORMED A HARD R TURN AND CLRED THE GRUMMAN'S TAIL WITH ABOUT 15 FT TO SPARE. THIS ALL TOOK PLACE WITHIN A FRACTION OF A SECOND 50 FT ABOVE THE GND. AFTER AVOIDING THE GRUMMAN; I LOOKED BACK AND NOTICED THAT THE GRUMMAN LANDED AS IF NOTHING WAS WRONG. HE HAD TO HAVE SEEN MY ACFT FLY BY HIS. BROWN TWR THEN CALLED TO GRUMMAN AND SAID THAT 'YOU SIR; WERE INSTRUCTED TO LAND ON RWY 26L.' THE PLT'S RESPONSE WAS MERELY 'SORRY.' AFTER THE INCIDENT; I RETURNED FOR A NORMAL UNOBSTRUCTED LNDG; AND INSTRUCTOR CALLED THE TWR AND TALKED TO THE SUPVR.