What was found
NOSE LANDING GEAR WAS EXTENDED, BUT DID NOT LOCK IN THE DOWN POSITION. SUBSEQUENT INVESTIGATION REVEALED THE NLG INTERMEDIATE GEAR DRIVE TUBE ASSY WAS BENT. THE ANNUAL AND 100-HOUR INSPECTION WERE COMPLETED APRIL 19, 1996. TACHOMETER TIME 766.3. TOTAL TIME: 3,900.8 HRS. AIRCRAFT WAS PAINTED DECEMBER 22, 1995. THE NLG MAIN DRIVE TUBE ASSY WAS BROKEN. SUBMITTER STATED IMPROPER RIGGING MAY BE THE CAUSE.