MOONEY PLT ON APCH ENCOUNTERS WINDSHEAR AND MAKES A HARD LNDG. L WINGTIP AND AILERON DAMAGED IN ADDITION TO THE GEAR DOOR.

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ON FINAL TO RWY 28 WIND CHK CALL FROM TWR ELICITED 220 DEGS AT 14 KTS. APPROX ALT OVER NUMBERS 30 FT AGL. ENCOUNTERED DROP IN AIRSPD OF ABOUT 10-15 KTS. EXECUTED RECOVERY LANDED HARD. SUBSEQUENT EXAMINATION INDICATES NO NEED TO FILE UNDER PART 830.5. FLEW AIRPLANE TO HOME BASE FOR TEAR DOWN INSPECTION. DAMAGE: 1)L WINGTIP AND AILERON SCRAPES AND SURFACE DAMAGE; 2) R GEAR DOOR BUCKLED; AND 3) NO PROP STRIKE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THERE WAS NO FAA INVOLVEMENT SINCE THEY CONSIDER THIS AN INCIDENT. THE ACFT WAS A MOONEY 20F. THE WING WAS REBUILT FOR WHICH THE RPTR PAID EXTRA AS HE WANTED IT DONE AS AN ASSURANCE OF MINIMIZING ANY INTERNAL DAMAGE. RPTR SAID THAT HIS 4 TIMES A YR TRAINING WHICH HE TAKES TO KEEP SHARP WAS A HELP IN HIS THINKING ABILITY TO USE RUDDER RATHER THAN AILERON IN CORRECTING FOR THE WINDSHEAR. A COMMUTER ACFT THAT ARRIVED JUST AFTER HE DID INDICATED A 27 KT REDUCTION OF AIRSPD WHEN AT THE SAME POINT AS RPTR ON APCH. HE FEELS THE MIDWEST WX IS SO EXTREME THAT ONE MUST BE PREPARED FOR ANYTHING.