The document discusses the differences between aviation certification standards PART21G and EN9100. PART21G is the European regulation for aviation certification while EN9100 is an international quality management standard for the aerospace industry. The document outlines the requirements and objectives of EASA, the European aviation regulatory body, and describes the production organization approval (POA) process involved in PART21G certification. It also provides information on related standards organizations like IAQG and the roles of notified bodies in certifying organizations.