What was found
AFTER TAKEOFF, HEARD AND FELT LOUD RAPID VIBRATION COMING FROM BEHIND INSTRUMENT PANEL. VIBRATION QUIT AT ABOUT 300 FEET. LANDED UNDER AMBER ALERT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER TAKEOFF, HEARD AND FELT LOUD RAPID VIBRATION COMING FROM BEHIND INSTRUMENT PANEL. VIBRATION QUIT AT ABOUT 300 FEET. LANDED UNDER AMBER ALERT.