Regarding advisory circulars, which statement is true?

The statement that information in advisory circulars may become mandatory if adopted into an AD (Airworthiness Directive) note is accurate because it highlights a key aspect of how advisory circulars function within the regulatory framework. Advisory circulars are issued by aviation regulatory authorities to provide guidance and information to the aviation community regarding various aspects of compliance with regulations. While they initially serve as recommendations or best practices, the critical point here is the connection to Airworthiness Directives.

When certain recommendations or practices outlined in an advisory circular are determined to be necessary for ensuring safety or compliance, they can indeed be adopted into an AD. Once incorporated into an AD, the previously voluntary guidance becomes mandatory for those affected. This transformation shows the potential regulatory weight advisory circulars can carry, depending on how they are utilized or referenced in formal compliance documents like ADs.