As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTTOM SKIN OF BLADE DEBONDED FROM TIP ALONG STAINLESS LEADING EDGE FOR 28 INCHES AND APPROX 3 INCHES PEELED BACK, CAUSING SEVERE VERTICAL VIBRATION. PILOT DECLARED A MAYDAY AND CARRIED OUT PRE-CAUTIONARY LANDING. BLADE WAS REMOVED AND SENT TO CTI AS IT WAS REPAIRED AT CTI ONLY 3 HOUR BEFORE THE FAILURE, BLADE WAS INSPECTED BY TSB.