This handbook covers the subject areas that are common to both the Airframe and the Powerplant ratings and is the launching point for most AMT training programs. It is a reprint of the 2018 FAA-H-8083-30A with additional value provided because it was completely reviewed and edited to correct errors found in the original text, illustrations and photos. The general handbook covers aircraft basics, such as mathematics, physics, weight and balance, materials, corrosion, electricity, hydraulics, safety, FAA publications and regulations, and a chapter on human factors.