What was found
FLT#9, JFK-SDQ. (AIRCRAFT PERFORMED AN AIRTURN BACK TO JFK). "APPROX 10-15 MINS AFTER DEPARTURE A/C WAS LEVELING AT 12,000 FT, 250 KTS. A/C EXPERIENCED A GRADUAL UPDRAFT TO 12300 FEET, A/P KICKED OFF. F/O WAS CORRECTING, AS WE CLEARED WX. WE THEN ENCOUNTERED A SEVERE DOWN DRAFT OF 200-300 FT FOR 1-2 SEC. NO OVERSPEED EXPERIENCED AND NO OTHER ECAMS NOTED; ACCOMPLISHED DFDR DATA DOWNLOAD W/ REF TO AMM 31-33-00. PARAMETERS ANALYZED, W/ REF TO AMM 05-51-17. NO EXCEEDANCES FOUND ABOVE AMM LIMITS. NO FAULTS OR ABNORMALITIES NOTED. A/C OK FOR CONT SVC."