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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