Alternative Means of Compliance

Acceptable means of compliance (AMC)

AMCs are non-binding standards adopted by EASA to illustrate the means to establish compliance with the Basic Regulation and its Implementing Rules.
AMCs issued by EASA are not of a legislative nature. They cannot create additional obligations on the regulated persons, who may decide to show compliance with the applicable requirements using other means. However, as the legislator wanted such material to provide for legal certainty and to contribute to uniform implementation, it provided the AMC adopted by EASA with a presumption of compliance with the rules, so that it commits competent authorities to recognise regulated persons complying with EASA AMC as complying with the law.

Alternative means of compliance (AltMoC)

Since AMCs are non-binding, regulated persons may choose alternative means to comply with the rule. In this case, however, they lose the presumption of compliance provided by the EASA AMC, and need to demonstrate to competent authorities that they do comply with the law.
The implementing rules for Aircrew licensing and Air Operations describe the process to be used by regulated persons and competent authorities when they intend to use an AltMoC to comply with the rules.