What was found
((ZY2R)) LOSS OF BLADE TIP IN-FLIGHT. IN FLIGHT, PILOT EXPERIENCED SUDDEN VIBRATION. AS HE WAS OVER AN AIRPORT, IMMEDATELY POWERED BACK AND LANDED THE ACFT APPROX 9 MINUTES LATER. AFTER GO AROUND ACFT INSP PILOT DISCOVERED 1 TIP MISSING FROM THE 3-BLADED PROP. ROCK, STONE OR OTHER FOD AT THE L/E OF THE BLADE, CAUSING STRESS RISER, BENDING AND TWISTING AND LOADS IN THIS AREA LEADING TO BLADE FAILURE.