As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACY - FLT 8157 - ON GEAR RETRACTION LOUD THUMP IN NOSE GEAR FOLLOWED BY VIBRATION APPARENTLY CAUSED BY NOSE GEAR DOORS. RETURNED TO AIRPORT. REPLACED RIGHT NOSE GEAR DOOR ASSEMBLY ON PERFORMED OPS IAW DC9 MM 32-22-01 PAGE 201-205. OPS CHECK GOOD, NO DEFECTS NOTED. (M)