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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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There have been field reports of severe corrosion in the outer wing panel structure of several aircraft. The most effective means of preventing corrosion damage is early identification and correction.
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Interference of the torque tube with the front seat canvas and of the elevator bellcrank with the rear seat canvas.
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Copy of the Flottorp F12 Constant Speed Propeller Service Manual.
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Information on how to improve the lubrication characteristics of the Bendix S-1200 series magnetos.
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Failure of part number 69650 piston pins, caused by transverse grinding or heat cracks which occurred during manufacture of the piston pin.
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Inspect the attachment of lower hinge and if cracks have developed in the spar or rib reinforce with .040 dural or steel channel as shown.
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Rigging and leveling procedures for Piper PA-16.
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Steps to prevent wing fabric loosening along the upper surface of the front and rear spars in the area of the fuel tank causing a spoiler action.
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Recommendations to insure proper cooling of the engine.