What was found
AIR TURNBACK DUE TO NOSE GEAR WOULD NOT RETRACT THIS IS A REPEAT EVENT THAT LAST HAPPENED 7 LANDINGS AGO. REPLACED NOSE GEAR LOCK MECHANISM AND SPRINGS, CONSISTING OF INDIVIDUAL ITEMS P/N 65-46245-4, 65-46242-11, 65-46240-13 & 69-6745-1, ALL WITH 1327 HOURS AND 1009 LANDINGS SINCE OVERHAUL. REPLACED HYDRAULIC TRANSFER CYCLINDER P/N 69-14106-7 WITH 10 HOURS AND 7 LANDINGS SINCE OVERHAUL. REPLACED LOCK ACTUATOR P/N 65-17819-14 WITH 1327 HOURS AND 1009 LANDINGS SINCE OVERHAUL. RE-RIGGED NOSE GEAR DOORS. PERFORMED NORMAL RETRACTION AND EXTENSION TESTS. PERFORMED EMERGENCY EXTENSION TEST. ALL TESTS NORMAL.