What was found
AIRCRAFT WAS GROUNDED: DURING TAKEOFF AFTER ROTATION THERE IS A TREMENDOUS VIBRATION FROM NOSE GEAR AND THE VIBRATION SUBSIDES AFTER ABOUT 7 SECONDS. (OPEN)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT WAS GROUNDED: DURING TAKEOFF AFTER ROTATION THERE IS A TREMENDOUS VIBRATION FROM NOSE GEAR AND THE VIBRATION SUBSIDES AFTER ABOUT 7 SECONDS. (OPEN)