This is a high quality facsimile of Aircraft Electrical Systems, Hydraulic Systems, and Instruments by Colonel Rollen H. Drake, originally published in 1949. This is the first book to explain in simple, non-technical terms the theory, construction and operation of three complex and closely related parts of modern aircraft. It provides the instruction needed for the C.A.A. aircraft and engine mechanic certificate and special ratings in the subjects under discussion in 1949. Both theory and practice are fully covered. The basic principles of electricity and hydraulics are explained in terms most useful to the mechanic, showing just how these principles operate in aircraft electrical and hydraulic equipment. The interrelations between the electrical and hydraulic systems and instruments of aircraft are clearly explained, together with their functions in the aircraft as a whole. The construction and operation of each individual part of aircraft electrical and hydraulic systems and of all the various flight, navigation, engine and other instruments are fully described, with many illustrations and much practical information on symptoms and causes of failure. The whole book is thoroughly practical. Leading manufactures of the parts discussed have checked all the information for accuracy and have contributed many of the illustrations. In addition, there are many line drawings made by Earle R. Hough. The book contains over 400 illustrations. Outstanding for its clarity and completeness, the book is an excellent text for the student mechanic and a reliable, practical reference for the mechanic on the job.