Advisory circular information

Advisory circular
	FAA Publication
Abbreviation	AC
Organization	Federal Aviation Administration
Domain	Aviation safety
Website	FAA Advisory Circulars (ACs)

Advisory circular (AC) refers to a type of publication offered by the Federal Aviation Administration (FAA) to "provide a single, uniform, agency-wide system … to deliver advisory (non-regulatory) material to the aviation community."^[1] Advisory circulars are now harmonized with soft law Acceptable Means of Compliance (AMC) publications of EASA, which are nearly identical in content. The FAA's Advisory Circular System is defined in FAA Order 1320.46D.^[2]

By writing advisory circulars, the FAA can provide guidance for compliance with airworthiness regulations, pilot certifications, operational standards, training standards, and any other rules within the 14 CFR Aeronautics and Space title, aka 14 CRF or FARs. The FAA also uses advisory circulars to officially recognize "acceptable means, but not the only means," of accomplishing or showing compliance with airworthiness regulations.^[3]^[4] Advisory circulars may also contain explanations, clarifications, best practices, or other information of use to the aviation community.^[2]^[5]

^ "Advisory Circular". CFI Notebook. Certified Flight Instructor's Notebook. Retrieved 2024-04-20. Advisory Circulars (ACs) provide a single, uniform, agency-wide system that the FAA uses to deliver advisory (non-regulatory) material to the aviation community
^ ^a ^b "Order 1320.46D Advisory Circular System" (PDF). FAA Order. FAA. 2015-04-07. Retrieved 2024-04-20.
^ Leanna Rierson (19 December 2017) [7 January 2013]. Developing Safety-Critical Software: A Practical Guide for Aviation Software and DO-178C Compliance. CRC Press. p. 49. ISBN 9781351834056. Retrieved 2024-04-10. The recognition typically comes in the form of an Advisory Circular (AC) for the FAA and equivalent advisory materials by other certification authorities.
^ David B. Walen FAA, Civil Aircraft System Safety and Electromagnetic Compatibility, November 16, 2010, p. 6. "Compliance with Regulations: FAA Guidance for compliance with airworthiness regulations published within Advisory Circulars (ACs) | Define acceptable, but not the only, means to comply with the airworthiness regulations | For example, AC 25.1309-1A describes acceptable means for showing compliance with 14 CFR 25.1309"
^ Hartman v. United States (United States District Court for the Western District of Oklahoma Feb 8, 2013) ("10. ACs are “advisory” only. ACs provide guidance such as methods, procedures, and practices acceptable to the FAA for complying with regulations and grant requirements. ACs may also contain explanations of regulations, other guidance material, best practices, or information useful to the aviation community. They do not create or change a regulatory requirement. An AC may reflect or restate ways to implement regulatory requirements otherwise established by statute, regulation or grant agreements, but, by FAA order, an AC itself may not impose requirements or prohibitions. (Deemed admitted by the court for the reasons discussed below.)"), Text. Note: This is verbatim from FAA Order 1320.46D.

[1] "Advisory Circular". CFI Notebook. Certified Flight Instructor's Notebook. Retrieved 2024-04-20. Advisory Circulars (ACs) provide a single, uniform, agency-wide system that the FAA uses to deliver advisory (non-regulatory) material to the aviation community

[Order1320.46D-2] "Order 1320.46D Advisory Circular System" (PDF). FAA Order. FAA. 2015-04-07. Retrieved 2024-04-20.

[3] Leanna Rierson (19 December 2017) [7 January 2013]. Developing Safety-Critical Software: A Practical Guide for Aviation Software and DO-178C Compliance. CRC Press. p. 49. ISBN 9781351834056. Retrieved 2024-04-10. The recognition typically comes in the form of an Advisory Circular (AC) for the FAA and equivalent advisory materials by other certification authorities.

[4] David B. Walen FAA, Civil Aircraft System Safety and Electromagnetic Compatibility, November 16, 2010, p. 6. "Compliance with Regulations: FAA Guidance for compliance with airworthiness regulations published within Advisory Circulars (ACs) | Define acceptable, but not the only, means to comply with the airworthiness regulations | For example, AC 25.1309-1A describes acceptable means for showing compliance with 14 CFR 25.1309"

[HartmanVUS-5] Hartman v. United States (United States District Court for the Western District of Oklahoma Feb 8, 2013) ("10. ACs are “advisory” only. ACs provide guidance such as methods, procedures, and practices acceptable to the FAA for complying with regulations and grant requirements. ACs may also contain explanations of regulations, other guidance material, best practices, or information useful to the aviation community. They do not create or change a regulatory requirement. An AC may reflect or restate ways to implement regulatory requirements otherwise established by statute, regulation or grant agreements, but, by FAA order, an AC itself may not impose requirements or prohibitions. (Deemed admitted by the court for the reasons discussed below.)"), Text. Note: This is verbatim from FAA Order 1320.46D.

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