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Inspect for crushing of the stabilizer front spar and the aluminum alloy reinforcing spacers.
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Instructions to provide an alternate source of fuel tank venting in case of fuel tank vent obstruction by foreign material and/or sticking of the fuel vent valve.
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Steps to prevent the possible loss of elevator trim control.
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How to detect cracks in the muffler assembly in Cessna model airplanes incorporating Piper Muffler Assembly P/N 10308-00 with the installation of a Lycoming engine.
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Prevent failure of the fuel line fittings or the gascolator due to the current airplane design configuration. Such failure could result in a lack of fuel to the engine with consequent loss of control of the airplane.
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Fatigue failures have continued to occur in the rudder main rib where the control horn is attached after installation of reinforcement plates.
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Frequent failures of the rear spar center section due to cracking of the upper flange.
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Failures of the rudder horn attachments, attributed to improper ground handling technique rather than to unusual flight loads.
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To eliminate instances of the nose ski coming off when operating on Federal Aircraft Works Model A-1500 skis, a supplementary safety device should be installed.
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Install a new battery box drain tube to extend at least 1/2 inch below the fuselage belly skin if this has not been already incorporated in the airplane.