What was found
AT APPROXIMATELY 1000 FEET AGL, THE CREW EXPERIENCED A STRONG VIBRATION AND RETURNED TO PIT. MAINTENANCE INSPECTED AND FOUND A FLAT SPOT ON THE NOSE WHEEL TIRE. MAINTENANCE REPLACED THE NOSE WHEEL TIRES IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-00-00. MAINTENANCE ALSO FOUND THE LEFT HAND PROP TO BE OUT OF BALANCE. MAINTENANCE BALANCED THE LEFT HAND PROP IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 61-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.