A C550 PLT RPTS FLAP DAMAGE FROM RWY LIGHT CONTACT SUSTAINED DURING A LOW VISIBILITY WINDSHEAR MISSED APCH.

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THIS EVENT OCCURRED IN A CESSNA CITATION S/II ON THE VISUAL DSCNT FROM MDA OF A NON PRECISION APCH. AT APPROX XA00 THE CAPT AND I REPOSITIONED THE ACFT TO ZZZ FROM ZZZ1. WX AT THE DEST WAS RPTING 600 FT OVCST; 4 MI VISIBILITY; AND WINDS 060 DEGS AROUND 20 KTS. WE WERE BEING VECTORED FOR THE LOC 35 AT ZZZ. I WAS THE PF AND DID NOT HAVE RWY CONTACT AT A SUITABLE ENOUGH TIME AND INITIATED A GAR. WE RECEIVED VECTORS FROM BOS APCH FOR A SECOND ATTEMPT AND THE WX WAS RPTING THE SAME EXCEPT WITH WINDS NOW 080 DEGS AT 20 KTS. ATC RPTED LEVEL 3 WX S OF ZZZ AND GAVE US VECTORS FOR A R DOWNWIND TO THE LOC 35 ZZZ. THE APCH WAS CONDUCTED ACCORDING TO PROFILE; AND WAS NORMAL WITH THE RWY IN SIGHT DURING DSCNT TO THE MDA. UPON TRANSITION FROM MDA TO DSCNT TO THE RWY THRESHOLD; WE BEGAN TO ENCOUNTER RAIN; AND STRONGER GUSTS. AS WE ENTERED THE LNDG FLARE; THE RAIN BECAME HVY AND MADE FORWARD VISIBILITY DIFFICULT. AT THE SAME TIME; WE BEGAN TO ENCOUNTER AN INCREASING WIND SHIFT TO THE TAIL OF THE ACFT WHICH SEEMED TO BE CAUSING US TO FLOAT PAST THE FIRST 1/3 OF THE RWY; OUR PLANNED/PROFILED LNDG ZONE. AT THE FIRST ONSET OF THIS WINDSHEAR AND REDUCED VISIBILITY; WE INITIATED A GAR; AND I ADDED GAR PWR IMMEDIATELY. THE WHEELS MOMENTARILY TOUCHED THE SURFACE AND WE WERE AIRBORNE IMMEDIATELY AND ON THE GAR PROFILE. AT ABOUT 300-400 FT; THE ACFT WOULD NOT RESPOND VERY WELL TO PITCH UP COMMAND IN THE NOW CLEAN CONFIGN DUE TO THE SAME WINDSHEAR CONDITION. A FEW SECONDS LATER WE WERE ABLE TO CLB OUT OF IT AND CLBED TO THE ATC REQUEST OF 3000 FT. WE CONTINUED UNEVENTFULLY TO ZZZ1 WHERE WE CONDUCTED THE ILS 11; AND LANDED WITHOUT FURTHER INCIDENT. UPON THE POSTFLT INSPECTION OF THE ACFT; I NOTICED THERE WAS L OUTBOARD FLAP DAMAGE; DUE TO AN APPARENT RWY LIGHT STRIKE. I IMMEDIATELY ALERTED THE CAPT; WHO FOLLOWED OUR PROCS TO NOTIFY THE DIRECTOR OF OPS. WE FOLLOWED COMPANY PROCS FOR NOTIFICATION AND COOPERATED FULLY WITH COMPANY AND INVESTIGATIVE REQUESTS. WHAT I LEARNED FROM THIS INCIDENT WAS HOW FAST THE EFFECTS OF WINDSHEAR TAKE PLACE; AND HOW LITTLE REACTION TIME IS REQUIRED. I BELIEVE THAT QUICK REACTION TO THE POSSIBILITY OF WINDSHEAR MAY HAVE PREVENTED FURTHER DAMAGE; AS WELL AS PREVENTED AN INCIDENT TO BECOME AN ACCIDENT. I BELIEVE THAT CONTRIBUTING FACTORS TO THIS INCIDENT WERE: 1) THE CREW'S DECISION TO CONDUCT THE APCH WITHIN 10 MI OF RPTED LEVEL 3 WX; 2) THE XWIND SHIFTING TO TAILWIND WITHIN SECONDS; AND 3) THE REDUCED VISIBILITY DUE TO THE HVY RAIN THAT BEGAN TO FALL AT A CRITICAL PHASE OF FLT IN THE LNDG FLARE.