What was found
WHILE IN CRUISE AT FL 390, ENGINE BEGAN VIOLENT VIBRATION WITH INCREASE ITT. IF&D AND SAFE LANDING EXECUTED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE IN CRUISE AT FL 390, ENGINE BEGAN VIOLENT VIBRATION WITH INCREASE ITT. IF&D AND SAFE LANDING EXECUTED.