AN MD10 AT FINAL APCH FIX EXTENDED FLAPS 35 SPEED LESS THAN 170 KTS; CREW NOTICED SLIGHT BUMPING IN YOKE. ON GND DISCOVERED 8 FT SECTION OF INBOARD FLAP VANE MISSING.

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VECTORED ON DOWNWIND AT ZZZ; SLOWED TO 210 KTS AND EXTENDED SLATS. TURNED BASE AT 10-12 MI. AT 190 KTS EXTENDED FLAPS 15. INTERCEPTED LOC AT 9-10 MI; SLOWED TO 170 KTS AND EXTENDED FLAPS 22 (SIX MI IN TRAIL OF MD-11.) GEAR DOWN APPROX 8 MI. AT FAF SLOWED TO LESS THAN 170 KTS AND EXTENDED FLAPS 35. I NOTICED A SLIGHT BUMPING OF THE YOKE (IT FELT LIKE NORMAL TURB AS WE HAD 15 TO 20 KT XWIND). I SELECTED FLAP 50 WITH NO CHANGE TO CONTROLS; RESELECTED FLAP 35 AND MADE NORMAL LNDG. WIND WAS LESS THAN FIVE KTS AT TOUCHDOWN. NOTIFIED NEXT DAY BY MAINT THAT R INBOARD FLAP VANE WAS MISSING AN EIGHT FT SECTION. I RECOMMEND THAT OUR PROCS BE CHANGED DUE TO THIS BEING THE SECOND FLAP PROB LIKE THIS IN TWO WKS. POSSIBLY HAVE MAINT CHECK THE FLAPS AFTER ARR AT THE RAMP. MAYBE CHECK FLAPS AFTER ENG START. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED OTHER THAN THE SLIGHT BUMPING OF THE YOKE THAT OCCURRED AT EXTENSION OF FLAPS 35 EVERYTHING APPEARED NORMAL. THE RPTR SAID THIS IS THE SECOND FLAP VANE DEP INCIDENT IN TWO WEEKS AND MAY REQUIRE SOME ADDED MAINT CHECKS OR INSPECTIONS.