29 Aug 2008 Official Publication Amendment 4 Certification Specifications group AMC-20 General Acceptable Means of Compliance for Airworthiness of Products, Parts and Appliances Read MoreRelated Content Read More CS file [pdf] AMC-20 / Amendment 4 Related ED Decision ED Decision 2008/007/R Explanatory Note [pdf] AMC-20/ Amendment 4 - Explanatory Note Related Content [pdf] Easy Access Rules for Acceptable Means of Compliance for Airworthiness of Products, Parts and Appliances (AMC-20) (Amendment 4)