What was found
THE LANDING GEAR WAS BEING OPS CHECKED DURING A SHEDULED COMPLETE INSPECTION. WITH THE AC ON JACKS, THE LANDING GEAR WAS BEING RETRACTED WHEN THE ACTUATOR FAILED BEFORE THE GEAR WAS COMPLETELY RETRACTED. THE NUT ASSY FAILED JUST BELOW THE THREADED SECTION WHICH CAUSES THE NLG TO FALL DOWN BUT UNLOCKED WITH NO MEANS TO RETRACT OR LOCK THE GEAR DOWN. THIS FAILURE IS VERY SIMILAR TO THE MLG ACTUATOR FAILURE ADDRESSED IN SB 32-3433. (K)