As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APPROXIMATELY 240 KTS, INDICATED A SUDDEN LOUD RUSHING AIR NOISE WAS HEARD FROME THE NOSE. A SLIGHT VIBRATION ACCOMPANIED THE SOUND. AFTER DECREASING AIR SPEED SOUND WAS STILL PRESENT. WHEN GEAR WAS EXTENDED, INCREASED VIBRATIONS WERE FELT. ITEM IS UNDER INVESTIGATION.