What was found
ON LANDING APPROACH, O/B FLAPS DIDN'T EXTEND WITH FLAP HANDLE, I/B FLAPS OKAY. SUBSEQUENT SYSTEM-A HYD HAD TOTAL LOSS. CHECKLIST, M/GAR EXTENSION AND LANDED OKAY. FOUND O/B TRAILING EDGE BYPASS VALVE BODY SEPARATED. REMOVED AND REPLACED VALVE, LEAK CHECKS OKAY. OPS CHECK FLAP SYSTEM, HYD AND ELECTRICAL, ALL CHECK OKAY PER MM 27-51-151. DUE TO LOSS OF A-SYSTEM FLUID, PERFORMED MM 29-11-0 PAGE 102, ALL FILTERS ARE CLEAN AND REPLACED. A/C OKAY FOR SERVICE.