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Modification and reinforcement of landing gear to prevent cracks in the leading edge of the streamlined tube where it joins the inboard end of the axle.
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Correction to the fuel grade specification in flight manuals and fuel tank placards for the Lycoming O-290-D2 engines.
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Misalignment of the oil radiator lines on the Lycoming 0-290-D2 135 horsepower engines at the point where they pass through the rear engine baffle.
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Failures of lift struts caused by abuse, failure to replace lift struts after ground accidents, and the use of damaged parts from scrapped airplanes as service replacement parts.
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Solution to water freezing in the oleo housing, which causes the nose wheel to become inoperative in regards to directional steering both on the ground and in the air.
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Modifying the battery box lid to eliminate the possibility of "shorting" the battery terminal wing nuts.
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Immediate inspection of clearance between the aileron cable and the master switch wires (from the master switch to the ammeter).
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Instructions for inspecting the battery box lid for proper clearance between the lid and the battery terminals.
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The weight and balance forms which were issued with all Model PA-11-90 airplanes, prior to serial number 11-993, are not correct in so far as loading and C. G. limits specified are concerned.
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These inspection notes are issued as a recommended check list to assist owners, operators, and maintenance personnel in keeping their Piper airplanes in an airworthy condition.