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Inspect front and rear control stick socket castings for cracks at the ears to which the push-pull tube attaches.
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Inspect the wing leading edge for buckled nose ribs or loose PK screws.
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Steps to prevent exhaust system cracking.
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Steps to detect permanent deformation and/or cracks in the lower frame side tubes on the adjustable front seat.
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Directions to prevent possible engine power loss due to fatigue failure of the carburetor alternate air valves.
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How to detect battery acid corrosion of elevator and rudder control cables and corrosion of other airframe components in the battery area.
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How to prevent structural failure of the lower longerons.
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As a result of several cases of engine power loss due to the carburetor alternate air door being sucked into the engine, make the spring loaded alternate air door inoperative by one of the following methods.
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To eliminate interference and failure of the turnbuckle forks at the attachment points of the two elevator control cables to the horn located on the bottom of the control column, confirm that AN 161-16RS turnbuckle forks have been replaced by AN 160-16S forks.
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Directions to prevent failure of the upper wing front spar strut fittings, P/N 2-1976, that could result
in an in-flight separation of the wing.