Amending Decision No. 2003/01/RM of the Executive Director of the Agency of 17 October 2003 on Acceptable Means of Compliance and Guidance Material for the airworthiness and environmental certification of aircraft and related products, parts and appliances, as well as for the certification of design and production organisations (âAMC and GM to Part-21â? âImprovement of GM to 21A.101â?(Establishment of the type-certification basis of Changed Aeronautical Products)