The proceedings of the 24th Aerospace Mechanisms Symposium, which was hosted by the John F. Kennedy Space Center, Kennedy Space Center, Florida, on April 18 to 20, 1990, are reported in this NASA Conference Publication. The symposium was sponsored by the National Aeronautics and Space Administration, the California Institute of Technology, and Lockheed Missiles and Space Company, Inc. The purpose of the symposium was to provide a forum for the interchange of information among those active in the field of mechanisms technology. To that end 26 papers were presented on aeronautics and space flight, with special emphasis on actuators, aerospace mechanism applications for ground support equipment, lubricants, latches, connectors, and other mechanisms for large space structures. The papers were prepared by authors from a broad aerospace background, including the U.S. aerospace industry, NASA, and European and Asian participants.