TRIPS 221

6 Primary and secondary control surfaces; function of control surfaces. 7,41 Airplane Ignition U.S. Department of the Navy, 1942. Basic operating principles and maintenance of the ignition system. (SN 800; 1 62 frames) The Airplane Mechanic U.S. Office of Education, 1945. Reviews material presented in motion picture, same title. (OE 278; 44 frames)