The first volume in a definitive series of textbooks dedicated to aircraft engineering maintenance, this book provides a crucial outline of aircraft engineering principles. It is valuable for anyone pursuing a career in aircraft maintenance engineering or a related aerospace engineering discipline, and in particular will be suitable for those studying for licensed aircraft maintenance engineer status. The book systematically outlines modules 1, 2, 3, 4 and 8 of Appendix III Part-66, the European Aviation Safety Agency requirement for aircraft engineers within Europe that are also being continuously harmonized with Federal Aviation Administration requirements in the USA.