As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1122 - AFTER TAKEOFF ORD EN ROUTE TO BOS WITH GEAR RETRACTED THERE WAS A LOUD VIBRATION NOISE COMING FROM THE NOSE GEAR AREA. AS SPEED INCREASED THE NOISE GOT LOUDER. AIR INTERRUPTED AND RETURNED TO ORD AND LANDED WITHOUT INCIDENT. CLOSED NOSE GEAR DOOR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)