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Interference of the baffle with the filter element within the carburetor filter assembly, resulting in a jamming of the throttle and a lack of proper carburetor heat control, has been reported.
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Failures, occurring as cracks in the center section belly skin at the rearmost rivet attachment in the center section belly skin outer stiffeners (415-13056 L/R), have been reported.
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It has been found necessary to provide a positive lock on the zipper at the bottom of the baggage compartment to eliminate the possibility of it opening while in flight, and having articles fall into the controls.
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Procedure for replacing the fuselage gas tank overflow line due to the imperial brass compression sleeve having necked the line causing it to fail.
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Means of preventing the hinge pins from vibrating loose and moving forward into the propeller.
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Eliminating the possibilities of a rudder bellcrank seizure caused by the bakelite bushing that has expanded due to moisture within the bushing.
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Replacing aluminum alloy fitting AN914-2D, which is located between the fuel filter and the carburetor, with copper alloy fitting AN914-2.
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Changes have been effected to prevent further failures in the elevator trim unit handle crank shaft and worm wheel shaft.
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The tube clamps used to secure the muffler to the exhaust stacks have not been providing satisfactory service in that they permit the muffler to loosen and move around.
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The battery box drain tube on the affected airplanes may in some cases be insufficiently long to protrude 1/2 inch below the belly skin of the airplane.