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Undetected corrosion in the aileron pushrod tube may lead to failure of the tube, loss of control of the aileron and possible loss of control of the aircraft.
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Concern of dissimilar metal corrosion occurring where the steel elevator control horn attaches to the aluminum lateral stiffener located within the elevator assembly.
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Required visual or tactile examination of the wing tank fuel shut off valve and the main fuel shut off valve to insure that both valves are open prior to every flight.
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Procedure for inspection of the wing center section to establish the condition of the center section structure.
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Procedure for visual inspection of part number 40511 muffler.
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Procedure for visual inspection of outer wing panel structure for evidence of corrosion.
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Procedure for visual inspection of coating on fuel gauge cork floats and inner fuel tanks for deterioration.
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Procedure for visual inspection of wing tip area for evidence of cracks.
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Procedure for dye penetrant inspection of control column tee for evidence of cracks.
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Replacement of aluminum fittings between carburetor and gascolator with steel or brass fittings, verification of gascolator braces, and installation of new gascolator.