What was found
DEPARTED, ENROUTE. RIGHT AT ROTATION, NOTICED A VIOLENT SHIMMY. ELECTED TO TAKEOFF. RAISED MLG AND DEPARTED. ONCE CLEAR OF DEPARTURE, LOWERED MLG FOR INSP TO SEE IF THERE WAS ANYTHING OUT OF NORM. NLG WOULD NOT EXTEND & GREEN NOSE LIGHT WOULD NOT ILLUMINATE. MLG NOT VISIBLE IN LT SPINNER. MLG CYCLED 3 MORE TIMES. ALL ATTEMPTS WOULD NOT EXTEND NLG. ACFT DIVERTED. PERFORMED 2 LOW PASSES MLG DOWN. GROUND COULD VISUALLY SEE NLG EXTENDED, NO GREEN INDICATION. SETUP FOR A NORMAL APPROACH. UPON TOUCHDOWN, ENGINES FEATHERED & HELD NLG OFF AS LONG AS POSSIBLE. NLG HELD & LIGHT ILLUMINATED. ACFT TOWED TO HANGAR. A VISUAL INSPECTION OF NLG REVEALED BOLT THAT CONNECTS NOSE WHEEL STEERING ACTUATOR TO NLG WAS MISSING. MX FOUND ACTUATOR END SPACER SHAFT (IPC PAGE 2-81, FIG. 2-19. ITEM -75) MISSING. SHAFT IS HELD INTO SPACER WITH A ROLL PIN, PIN SHEARED AND SHAFT FELL OUT LEAVING NOSE WHEEL FREE & UNCONTROLLED. CHECKED ANOTHER ACFT A LOCK NUT WAS FOUND HOLDING THE ACTUATOR ON THE SHAFT WHICH IS INCORRECT. A CASTLE NUT WITH A COTTER PIN IS CORRECT WITH NO TORQUE ON THE NUT TO ALLOW MOVEMENT.