A DHC-8-200 ON TKOF CLB RETURNED AND LANDED DUE TO DECAY OF PERFORMANCE AND BUFFETING. ON GND DISCOVERED R WING INBOARD LEADING EDGE MISSING.

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ON TKOF OUT OF ZZZ; THE FLT CREW NOTICED A DELAY OF PERFORMANCE AND A BUFFETING SIMILAR TO LIGHT TURB ON CLB OUT. UPON AGREEMENT THAT THIS WAS NOT NORMAL; WE DECIDED TO RETURN TO THE ARPT FOR LNDG. ON FINAL APCH; THE TWR RELAYED TO US THAT ACR Y (#1 FOR LNDG) RPTED A LARGE PIECE OF FOD APPROX 25 FT TO THE R OF THE CTRLINE APPROX 1000 FT FROM THE THRESHOLD. UPON LNDG; WE SAW THE FOD IN QUESTION AND AVOIDED IT FOR A SAFE LNDG. UPON SHUTDOWN AND POST FLT WALK AROUND; WE DISCUSSED THAT THE FOD IN QUESTION HAD IN FACT COME FROM OUR ACFT. IT WAS THE LEADING EDGE OF THE INBOARD R WING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE WALK AROUND CHECK DID NOT REVEAL ANY PROB WITH THE WING LEADING EDGE WHICH WAS CHECKED VISUALLY FOR DENTS AND DAMAGED DEICER BOOTS. THE FACT THE DEICER BOOT IS BLACK AND THE LEADING EDGE FASTENERS ARE ALSO BLACK WOULD NOT HELP IN NOTING ANY MISSING FASTENERS. ON RETURN TO THE FIELD; THE TWR ALERTED US TO FOD JUST OFF THE CTRLINE OF THE RWY AND THIS TURNED OUT TO BE THE MISSING LEADING EDGE ASSEMBLY. CALLBACK CONVERSATION WITH RPTR ACN 639896 REVEALED THE FOLLOWING INFO: THE RPTR WAS CALLED TO THE AIRPLANE AFTER THE TECHNICIANS HAD REMOVED THE LEADING EDGE ASSEMBLY TO ACCOMPLISH A REPETITIVE INSPECTION ON A CRACK IN THE R WING FORWARD SPAR. THE INSPECTOR CHECKED FOR CRACK PROGRESSION AND FOUND NONE AND ADVISED THE TECHNICIANS TO REINSTALL THE WING LEADING EDGE. THE TECHNICIANS FITTED THE LEADING EDGE ASSEMBLY ON THE WING AND PUT SEVERAL FASTENERS IN FINGER TIGHT AND WENT TO LUNCH. AFTER LUNCH; THE TWO TECHNICIANS WERE REASSIGNED TO ANOTHER AIRPLANE IN THE HANGAR THAT WAS ROUTED BUT WAS FALLING BEHIND IN THE CHECK. NEITHER THE INSPECTOR NOR THE TECHNICIANS WHO REMOVED THE R WING LEADING EDGE ASSEMBLY WROTE UP CARDS DESCRIBING THE INCOMPLETE R WING LEADING INSTALLATION. NO DOCUMENTATION EXISTED STATING THE ACTUAL CONDITION OF THE R INBOARD LEADING EDGE ASSEMBLY NOT BEING SECURED. THE AIRPLANE WAS TOWED TO THE GATE AND DISPATCHED.