We have all seen evidence of propeller unbalance:

� Cowling and baffle wear and cracks.

� Spinner failures

� Failed exhaust pipes, brackets, and clamps

� Loose rivets and fasteners

� Abnormal engine control cable wear

� Unserviceable crankshafts at overhaul

� Alternator bracket failures

� Premature instrument and avionics failures

� Premature landing light failures

� Abnormal airframe and engine vibration