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How to remove the fin for spar inspection, and required replacement parts if failure exists.
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Inspect the aileron support ribs for indications of buckling or cracking.
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Due to the independent suspension of the floats, racking loads imposed by rough water operation can cause extensive structural damage. As a result, the following inspections and modifications are necessary.
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Steps to preclude the possibility of fuel coming in contact with the left exhaust manifold in the event of a failure in the primer line.
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Reinforce attachment of the safety belt brackets to the skin of the fuselage.
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Directions to prevent failure of the seat back which could result in loss of control of the airplane.
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Prevention of a degradation of the induction system icing protection or partial engine power loss.
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Until the lower bracket supporting the fuel shutoff valve is modified in accordance with Champion Service Letter No. 73, acrobatic maneuvers in aircraft of these models may not be performed.
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To prevent failure of the rear fuselage-wing attachment fitting, reinforcement is to be accomplished by either of the following methods.
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Remove the tires and inspect the wheel flanges for fatigue cracks.