What was found
NR 2 HYDRAULIC SYSTEM FAILED ON TAXI IN. DURING POST FLIGHT INSPECTION, FOUND LEFT, INBOARD FORE FLAP SPLIT IN HALF AT MID TRACK POSITION (LEFT HALF SEPARATED FROM AIRCRAFT). THIS CAUSED FLAP TO CONTINUE BEYOND ITS STOP DURING RETRACTION AND CONTINUED INTO WING INNER TRAILING EDGE STRUCTURE AND HYDRAULIC LINES. LT INBD FLAP VANE INBD TRACK ASSY REPLACED LT INBD FLAP VANE CENTER TRACK & SPRING CARTRIDGE ASSY. REPLACED LT INBD FLAP VANE OTBD TRACK ASSY REPLACED LT INBD FLAP VANE ASSY R & R DAMAGED STRUTS MPN ARC0457507 & 507 ON WING TE STRUCTURE PER MD11 SRM/SMP. AIRCRAFT OK FOR SERVICE. LT INBD FLAP VANE ASSY ADJUSTMENT AND TEST CARRIED.