1. Propeller reversing problems, address by David L. Posner, chief of Technical Staff, Office of Aviation Safety, Civil Aeronautics Administration before Institute of Aeronautical Sciences, Hotel Astor, New York City, Jan. 29, 1953. Bookmark Corporate/Agency Authors: Civil Aeronautics Board and Commerce Dept. Publisher: Civil Aeronautics Board Date: [1953.] SuDoc number: C 31.124:P 84