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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.
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Due to failures of the Magnesium Die Cast Nose Wheel (which bears the number 34206 in raised letters), this wheel should be replaced by a Permanent Mold Aluminum Alloy Nose Wheel.
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Installing new inspection holes, modifying the wing tip fairings, and inspecting the wing spars for intergranular corrosion.
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Inspecting the existing aluminum vertical stabilizer forward attach fitting for cracks, and replacing any cracked parts.
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Inspect the vertical stabilizer rear spar fuselage attachment fitting for evidence of cracks in the fitting flange.
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Remove small baffle LAC P/N 181112 to allow for more accurate airspeed readings. With baffle installed readings can be incorrect by as much as +15 mph.
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Requires inspecting the front and rear wood spars for damage, including installing any as-needed inspection holes; and repairing or replacing any damaged wood spar.