AML means Aircraft Maintenance Licence and is normally called a Part-66. This official document is issued by the aviation authorities of an EU member state. On this document is stated for which category the holder of the AML is approved. After the succesfull completion of an aircraf type training course (Theory + Practical + OJT) the aircraft types are added (only applicable to Part-66 categories B1, B2 and C) on the Part-66 AML.