As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF OUT OF KMIA AND RAISED THE LANDING GEAR EXPERIENCED HEAVY NOSE VIBRATION. RECYCLED LANDING GEAR, BUT DID NOT HELP. DECLARED EMERGENCY AND LANDED OVERWEIGHT WITH FULL FLAPS. AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED NLG DOOR LT FWD DOOR LINK IAW MM 32-22-1. PERFORMED LANDING GEAR SWING AND FOUND NORMAL IAW MM 32-22-1. PERFORMED SPECIAL STRUCTURAL VISUAL INSPECTION IAW ARROW AIR DC8 MM 5-4-8 PAGE 1-6, NO DEFECTS NOTED.