Various tools are used to maintain and repair aircraft. However, another tool that must not be neglected consists of the publications and forms that serve as a guide and record for your maintenance activities. For example, a typical aircraft contains many miles of electric wire for indicating, lighting, and control systems. Attempting to troubleshoot a maintenance problem without access to the manufacturer's manual would be a frustrating experience. A thorough knowledge of regulatory publications such as the Federal Aviation Regulations, Civil Air Regulations and nonregulatory material such as manufacturer's manuals is important.