727 ENCOUNTERS WIND SHEAR ON APCH. MAKES A TOUCH AND GO; MISSED APCH. SECOND LNDG OK.

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ROUTINE APCH INSIDE 3 MI - TWR ADVISED OF LLWSA AND ADVISED OF SPECIFIC WIND SPD AND DIRECTION AT LGA. TWR SAID WIND HAD BEEN STEADY FROM NE LESS THAN 10 KTS. AT 200 FT AGL; ACFT ACCELERATED 10 KTS. ACFT LANDED FAST (140 KTS) AND LONG; THROTTLES WERE RETARDED. THEN AIRSPD INCREASED TO 150 KTS. WIND SHEER ESCAPE MANEUVER WAS EXECUTED AND WE DID A TOUCH AND GO. SECOND APCH WAS ROUTINE - LNDG ROUTINE. THIS WAS BY FAR THE WORST WIND SHEAR I HAVE EVER ENCOUNTERED! I'M CERTAIN IF WE HAD TRIED TO STOP WE WOULD HAVE ENDED UP IN FLUSHING BAY. IN A MATTER OF A FEW SECONDS WE WENT FROM A NORMAL; ROUTINE APCH TO AN EXTREMELY DANGEROUS SIT WHICH CALLED UPON ALL THE RESOURCES AND TRAINING OF ALL 3 FRONT END CREW MEMBERS! THE FE WAS PARTICULARLY VALUABLE - HE SAT BACK THERE AND TOOK IN EVERYTHING AND ACTED IN A MOST PROFESSIONAL MANNER. (BY OBSERVING AND RELAYING EVERYTHING TO CAPT AND COPLT.) I FEEL THIS IS THE CLOSEST I HAVE COME TO LOSING AN AIRPLANE. OUR WIND SHEAR SPECIFIC TRAINING IN THE SIMULATOR WAS INVALUABLE! IN DEC OF 1993 I HAD A SIMILAR SCENARIO IN THE SIMULATOR AND IT WAS FRESH IN MY MIND. ONE THOUGHT: I DON'T KNOW HOW THE A-320 WORKS; BUT IF THERE IS NO TOTALLY MANUAL BACK UP MODE; AND/OR IF SOME PROGRAMMING HAD TO BE DONE DURING THE GAR; THE ACFT WOULD HAVE BEEN DOOMED! AFTER OUR TOUCH AND GO LNDG; WIND SHEAR ESCAPE MANEUVER; WHEN WE WERE AIRBORNE AGAIN WE HAD SEVERAL MINS OF SEVERE TURB -- PLUS OR MINUS 40 KTS OF SPD; SEVERE ROCKING AND ROLLING OF WINGS. I AM A BELIEVER NOW! THE NEXT TIME I HEAR A WIND SHEAR WARNING - I'M GOING TO BE MORE INCLINED TO GAR EARLIER.