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Civil Aeronautics Board Bulletin, 1 March 1941
"When Propellers Kick, They Kick Hard"
The U.S. Civil Aeronautics Board (CAB) released this bulletin on propeller accidents and safety tips in 1941. Jerry Lederer was the first director (1940-1942) of the CAB Safety Bureau; he was well known for his efforts to disseminate safety information.
From the Flight Safety Foundation Jerry Lederer Aviation Safety Library (MS-016) in the Aviation Safety and Security Archives, Embry-Riddle Aeronautical University.