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Vibration has caused the quick oil drain valve to break at the rubber washer seal and also at the point where the copper drain tube is soldered.
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Maintenance procedures for improving the reliability of the gascolator.
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There are several items of equipment in the engine installation which should be carefully inspected to insure satisfactory winter operation.
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Inspecting wings for broken drag wires.
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Recommendations to prevent motor mount failures.
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Installing tailspring attachment reinforcing units, part numbers 30882 and 30871, to prevent tailspring attachment failure.
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To provide inspection access for the lift strut attachment fitting on the forward side of the front spar and to provide details for the inspection of wing components for corrosion.
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Repairs made in the aileron hinge bearing blocks utilizing dural rivets are unauthorized and all dural rivets must be removed and replaced with soft steel round head rivets of appropriate size.
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It has been found that the .040" brass safety wire which is being used to safety the propeller hub bolts does not provide a safety that is completely satisfactory.
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The importance of proper maintenance of the carburetor air filter for satisfactory service life of the engine.