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aircraft electrical and electronic systems principles operation and maintenance

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Aircraft Electrical and Electronic Systems continues the series of textbooks written for aircraft engineering students. This book addresses the electrical contents of the EASA Part 66 Modules 11 and 13; it also provides reference material for the avionic and aircraft electrical units of various BTEC National and Higher National, City and Guilds, NVQ and Foundation Degree modules.

 This book is designed to cover the essential knowledge base required by certifying mechanics, technicians and engineers engaged in engineering maintenance activities on commercial aircraft and in general aviation. In addition, this book should appeal to members of the armed forces and others attending training and educational establishments engaged in aircraft maintenance and related aeronautical engineering programmes. This book will also appeal to others within the aircraft industry who need an insight into electrical and electronic systems, e.g. pilots, engineering managers, etc.

 The book provides an introduction to the fundamentals of electrical, electronic and digital theory that underpins the principles of systems covered in the remainder of the book. For the reader that already has background knowledge of the fundamentals, the subsequent chapters can be read as individual subjects. For the reader that requires a deeper understanding of related fundamentals, additional material can be found in related books in the series:

 ● Aircraft Engineering Principles

 ● Aircraft Digital Electronic and Computer Systems

 ● Aircraft Communications and Navigation Systems. The books in this series have been designed for both independent and tutor-assisted studies. They are particularly useful to the ‘ self-starter ’ and to those wishing to update or upgrade their aircraft maintenance licence.

 The series also provides a useful source of reference for those taking ab initio training programmes in EASA Part 147 and FAR 147 approved organizations as well as those following related programmes in further and higher education institutions. The title of this book, Aircraft Electrical and Electronic Systems  , has been specifi cally chosen to differentiate between other avionic systems such as communications, navigation, flight guidance and instruments.

 The term avionics(aviation electronics) was first used in the late 1940s to identify electrical and electronic equipment such as radar, radio navigation and communications, although the term was not in general use until the late 1960s. During the 1970s, integrated computer-based systems were being developed, e.g. ground proximity warning systems; these used a number of existing aircraft sensors that monitored parameters such as barometric altitude, vertical speed and radio altitude. 

The continued development and integration of electrical and electronic systems, together with the widespread use of integrated circuits, microprocessors, data communications and electronic displays, have given new meaning to the term avionics. Aircraft engineers will be exposed to in-service aircraft using older technology, together with the new aircraft entering service based on modern technology. Using trends from the last 40 years, there will be an ever-increasing dependence on avionic systems. 

The eventual outcome could be the all-electric aircraft, a concept where traditional mechanical linkages, hydraulics and pneumatics are totally replaced by electrical and electronic systems. 

This book establishes a reference point for engineering students; it does not attempt to address all system types for all aircraft types.

 It is also important to note that this book does not attempt to provide the level of detail found in the aircraft publications, including the maintenance and wiring diagram manuals.

 Although there are many examples quoted in the book that are based on specific aircraft types, this is only done to illustrate a specific point. 

Throughout the book, the principles and operation of systems are summarized by numerous ‘ key  points ’ .

 The reader will be invited at regular intervals to assess knowledge via ‘ test your understanding ’  questions. Finally, the principles and operation of systems are put into the context of aircraft maintenance engineering by numerous ‘ key maintenance points ’ .