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The importance of proper maintenance of the carburetor air filter for satisfactory service life of the engine.
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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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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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Update to Service Letter #209.
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To prevent excessive wear of the primer line, resulting in fuel leakage and possible cabin fire, it is recommended that primer lines be clamped and/or re-routed per the sketch included with this letter.
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Information regarding modification of the shimmy dampener to prevent separation between the assembly body and the end plate.
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Concerns about some of the operational conditions which exist with the PA-18A agricultural airplane.
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Incorporating a heavy duty navigation light switch, Piper part number 484-575, manufactured by the Ohmite Manufacturing Company.
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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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Correction to the PA-12 Weight and Balance Form regarding the propeller installation arm.