This module provides the introduction to the EASA Aviation Legislation, the structure of the rules, the role of the International Civil Aviation Organization (ICAO), the European Aviation Safety Agency (EASA) and the national authorities. Also provided is an introduction to the Basic Regulation (Commission Regulation (EC) No. 216/2008) and basic knowledge about the Implementing Rules (Commission Regulation (EC) No. 2042/2003 and No. 1702/2003) with the corresponding annexes. Part-M, Part-145, Part-66, and Part-21. It presents an overview of the aircraft, parts and appliances Certification Specifications (CS) and the requirements of EU-OPS 1 for aircraft operation covering commercial air transportation (aeroplanes). Also covered are the specific regulations as they pertain to Part 66, Maintenance Certifying Staff, approved maintenance organizations and continued airworthiness standards and procedures.