What information is provided by advisory circulars (ACs)?

Advisory Circulars (ACs) are designed to provide nonregulatory information and guidance. They serve as a resource for pilots and aviation professionals, offering methodologies and best practices to comply with the Federal Aviation Regulations (FARs). ACs can cover a wide range of topics, including safety procedures, maintenance practices, and operational standards. The information in ACs is not mandatory but is highly encouraged as a means to enhance safety and promote compliance with the regulations.

In contrast to other options, strict regulations are not provided in ACs; those are found in the FARs themselves. ACs do not focus exclusively on emergency procedures nor do they primarily address financial aspects for aviation businesses, making the alternative options less relevant when it comes to understanding the primary purpose of these documents.