What was found
AIRCRAFT WAS GROUNDED: AFTER TAKE OFF LANDING GEAR GEAR DOORS NOT CLOSED, ECAM. AFTER PROCEDURE LANDING GEAR DOORS CLOSED NORMALLY. AFTER ROTATION HAD STRONG VIBRATION COMING FROM NOSE GEAR UNTIL OVER 100' AGL WHEN WE RETURNED TO FIELD IN CLT, LOWERED THE GEAR AFTER GEAR EXTENSION FELT A LOUD BANG FROM NOSE GEAR AREA. NOTE: NO EMERGENCY WAS DECLARED. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)