As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL 3 PROPELLER DE-ICE BOOTS DEBONDED FROM BLADE IN FLIGHT CAUSING A SEVERE VIBRATION. LANDED AT NEAREST AIRPORT WITH OUT INCIDENT. VISUAL INSPECTION REVEALED DEBONDING OF MOST OF THE BOOTS APPEARS TO BE A POORLY APPLIED BONDING APPLICATION.