Book excerpt: "The Aviation Maintenance Technician Handbook-General was developed as one of a series of three handbooks for persons preparing for mechanic certification with airframe or powerplant ratings, or both. It is intended that this handbook will provide basic information on principles, fundamentals, and technical procedures in the subject matter common to both the airframe and powerplant ratings. Emphasis in this volume is on theory and methods of application."--Preface of book.