What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS AFTER T/O, LARGE VIBRATION IN NOSE OF AIRCRAFT. SUSPECTED NOSE GEAR DOORS OPEN. RETURNED TO DFW. EMERGENCY DECLARED. MAINTENANCE REPORTS UPON LANDING AND ARRIVAL AT GATE, FOUND NOSE GEAR FORWARD DOORS OPEN. CHECKED DOOR STRUT LOCKS, FOUND TO BE OK, OPERATION OK. INSPECTED HINGES AND LINKS, NO DEFECTS NOTED. INSPECTED RADOME AND NOSE GEAR AREA. NO DEFECTS NOTED.