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Accidents have occurred in model 11AC and S11AC aircraft due to misuse of the fuel transfer system. These accidents have been caused by pilots attempting to transfer fuel while taking off or in a climb attitude.
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Prevent possible resonant vibratory conditions with McCauley Model 1A200/HFA fixed pitch propellers installed on Lycoming 0-360-C2A, or -C2E type engines.
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Steps to detect evidence of fatigue cracks and/or distortion of rib flanges, and required repairs if damage is found.
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Inspection of bottom rib of rudder for kinks or cracks in the rib flanges just aft of the rudder horn fitting.
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Removal of carburetor air heater muff and cabin heater muff; inspection of the muffler assemblies for any evidence of cracks; modification of placard calling for inspection every 25 hours.
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Inspection of the lower right-hand corner of the cutout in the fuselage rear bulkhead for cracks.
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How to eliminate the possibility of confusion in the operation of the fuel selector valve.
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Inspect the wing leading edge for indications of buckling in the skin which may result from failure of the spot welds attaching the skin to the nose ribs.
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Inspect the forward doorposts for cracks, particularly the flange section leading from the post to the instrument panel and the post itself below the top rivet cluster.
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Replace each of the four internal wrenching bolts which attach the engine to the engine mount with an AN 6 bolt and a special offset washer.