What was found
THE NOSE GEAR FAILED TO EXTEND FULLY BEFORE LANDING. ELECTRICAL AND MANUAL EXTENSION PROCEDURE WERE NOT SUCCESSFUL CAUSING THE NOSE GEAR TO COLLAPSE DURING LANDING. INSPECTION OF THE NOSE GEAR ACTUATOR, P/N 50-820208-5, REVEALED THAT NUT ASSY, P/N 90-820015-1, THREADS WERE STRIPPED. ACTUATOR TT: 5,385.2 HOURS. TC: 5,547. CYCLES SINCE 30-MONTH END PLAY INSPECTION, 153. ACTUATOR, S/N 625T81.