What was found
NOSE GEAR SCISSORS NOT PINNED PRIOR TO TAKE OFF, NLG WOULD NOT RETRACT INTO WHEEL-WELL, SEVERE VIBRATION FROM NOSE WHEEL WAS NOTED ON TOUCHDOWN. REMOVED NOSE LANDING GEAR LEG ASSY PN- D23332000-4 SN- B147. INSTALLED AN OVERHAULED NOSE GEAR LEG ASSY PN D233320004, SN B2. WORK DONE PER THE FOLLOWING F2000 WORK PROCEDURES : 32-203, 32-213, 32-201, 32-214, 32-401, 32-200, 32-300, AND 32-501.