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The tube clamps used to secure the muffler to the exhaust stacks have not been providing satisfactory service in that they permit the muffler to loosen and move around.
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The battery box drain tube on the affected airplanes may in some cases be insufficiently long to protrude 1/2 inch below the belly skin of the airplane.
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Load testing a defective part (number 415-52129 Shaft Assembly Control Column) in the aileron control system.
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Installation of Forney Modification Kit #29 to provide effective drainage of the fuselage tank and wing tanks by the use of quick drain fixtures.
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Provisions for expelling water and gasoline from the forward belly regions of the aircraft for all normal parking attitudes.
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The re-routing of the oil breather line will empty oil vapors almost directly to the outside of the airplane, helping to eliminate an excessively dirty engine compartment.
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Steps to increase the strength of the rudder at the control horn attachment.
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Bolts 415-34330 are made of case hardened, SAE 1113 steel, and a few of them purchased from an outside source have been found to be too brittle. Immediate replacement with standard AN 5-26 bolts is strongly recommended.
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Information on converting a Model 415-CD to a Model D or E; and Model 415-C to Model D or E.
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Required operation limitations for 75HP model 415-C, per supplement No. 6 of FAA No. 43 dated August 15, 1942.