What was found
DURING TAKEOFF, WITH POWER ABOVE 80 PERCENT TORQUE AIRCRAFT BEGINS VIBRATIONS INCREASING TO SEVERE WITH OSCILLATION BETWEEN 20-30 PERCENT ON TORQUE GAUGE. MAINTENANCE REMOVED AND REPLACED ENGINE ASSY WITH SERVICABLE SERIAL NUMBER CAE-890158. WORK DONE IAW BELL 206L-4 AND ROLLS ROYCE MAINTENANCE MANUALS. COMPLIED WITH OPS CHECK FLIGHT, PLUS 8 ON BELL POWER CHECK NO OTHER DEFECTS NOTED. (M)