This document contains the four volumes of an Air Force correspondence course in telephone equipment installation and repair. Each volume consists of student learning objectives, information, exercises, and answers to exercises; a volume review exercise is included for each volume. The first volume includes information about career field duties and responsibilities, introduction to management and supervision, security, fundamentals of electricity, basic electronic circuits, and telephone fundamentals. The second volume continues with the common-battery telephone system features. It reviews the basic principles of central office switching, the station equipment, maintenance and inspection, records, wire maintenance safety, and technical orders. The third volume reviews telephone installation principles including telephone station planning, installation work practices, terminal to telephone wiring, station termination and testing, and prevention maintenance and station trouble isolation. The final volume describes the varied uses of telephone communication systems and operating principles of exemplary equipment. At the end of this volume is a glossary; also included are seven schematic foldouts that are printed separately as three supplements. (KC)