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For sale is a January 8, 1941 Department of Commerce Civil Aeronautics Administration Certificate and Inspection Division Release No. 36 from Washington regarding improvement of engine idling characteristics in flight for 4 cylinder horizontal opposed engines. Prepared by Aircraft Airworthiness Section, signed by John F. Warlick, Acting Chief. Multi-page technical bulletin with airworthiness maintenance information for various aircraft models. Pre-WWII aviation document.
See photos for details. Contact me to verify condition. Some pictures may have missed a minor chip. If you have any questions or need to verify condition, message me. Date is approximate.
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