General worldwide: Chicago Convention aka ICAO convention (currently under auspices of UN), Annex 8 [2] and Annex 6 [3]. For USA [4], Title 14 of Code of Feder

General worldwide: Chicago Convention aka ICAO convention (currently under auspices of UN), Annex 8 [2] and Annex 6 [3]. For USA [4], Title 14 of Code of Federal Regulations, Chapter I Subchapter C, Part 39 For EU [5] Article 76 (6) of the Basic Regulation (EU) 2018/1139 [1] https://www.icao.int/publications/pages/doc7300.aspx https://www.icao.int/publications/pages/doc7300.aspx [2] https://ffac.ch/wp-content/uploads/2020/09/ICAO-Annex-8-Airworthiness-of-Aircraft.pdf https://ffac.ch/wp-content/uploads/2020/09/ICAO-Annex-8-Airw... [3] https://ffac.ch/wp-content/uploads/2020/09/ICAO-Annex-6-Operation-of-Aircraft-Part-I-International-commercial-air-transport.pdf https://ffac.ch/wp-content/uploads/2020/09/ICAO-Annex-6-Oper... [4] https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-39 https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C... [5] https://www.easa.europa.eu/en/document-library/regulations#basic-regulation https://www.easa.europa.eu/en/document-library/regulations#b...