FAA Advisory Circulars

FAA Advisory Circulars
Name	FAA Advisory Circulars
Caption	The Wright brothers' early flight at Kitty Hawk, North Carolina presaged modern Federal Aviation Administration guidance
Jurisdiction	United States
Agency	Federal Aviation Administration
Formed	1926
Website	FAA official site

FAA Advisory Circulars

FAA Advisory Circulars provide non-binding technical guidance from the Federal Aviation Administration to aviation stakeholders including aircraft manufacturers, air carriers, air traffic controllers, flight instructors, and aviation maintenance technicians. Issued alongside rulemaking by the United States Department of Transportation and interpreted in the context of precedents such as decisions from the United States Court of Appeals for the D.C. Circuit, these documents influence design, operations, training, and certification across the National Airspace System, the Federal Aviation Regulations, and related International Civil Aviation Organization standards.

Overview and Purpose

Advisory Circulars serve to explain acceptable means of compliance, clarifications of policy, and best practices for topics ranging from airworthiness standards to pilot certification and airport design. They complement binding instruments such as 14 CFR parts promulgated under the Aviation and Transportation Security Act and provide interpretive materials referenced by entities like Boeing, Airbus, Bombardier Aerospace, United Airlines, and Delta Air Lines. While Advisory Circulars address technical areas including avionics systems, airworthiness directives, and maintenance manuals, they also reflect recommendations consistent with outcomes in cases like National Transportation Safety Board proceedings and Supreme Court of the United States rulings that shape federal administrative law.

Structure and Numbering

Advisory Circular identifiers follow a numeric and suffix schema that groups guidance by subject areas similar to how Title 14 of the Code of Federal Regulations parts are organized. Numbering conventions align documents with topics such as airworthiness (e.g., swept-wing design), flightcrew training (e.g., crew resource management), remote piloted aircraft systems (RPA) reflecting interaction with Part 107 and other CFR sections. Each Circular includes sections for scope, background, recommended procedures, and appendices that may cite consensus standards from organizations like RTCA, Inc., SAE International, ASTM International, and ISO committees. The numbering system enables cross-references with advisory documents from international counterparts such as European Union Aviation Safety Agency and historical standards developed after events like the September 11 attacks that reshaped aviation policy.

Development and Issuance Process

Drafting typically involves FAA technical branches, program offices, and collaboration with external stakeholders including Aircraft Owners and Pilots Association, National Business Aviation Association, Air Line Pilots Association, and manufacturers such as Pratt & Whitney and General Electric (company). The FAA circulates drafts for public comment, engages with advisory committees like the RTCA Special Committee, and may coordinate with the Department of Defense for military interoperability issues. Final issuance follows internal review procedures, legal vetting by the United States Department of Justice Office advising federal agencies, and alignment with international obligations under the Chicago Convention on International Civil Aviation. High-profile updates have arisen after incidents investigated by the National Transportation Safety Board or after litigation at the United States Court of Appeals for the Ninth Circuit that affected regulatory interpretation.

Types and Content Examples

Advisory Circulars range from detailed engineering guidance to operational checklists. Examples address topics such as stall recovery techniques taught in Civil Air Patrol programs, fuel system icing prevention used by FedEx Express and UPS Airlines, human factors guidance influenced by research from the National Aeronautics and Space Administration and MIT, and cybersecurity recommendations reflecting coordination with Department of Homeland Security. Other ACs provide acceptable means for noise certification aligned with the Environmental Protection Agency and describe unmanned aircraft system integration into the National Airspace System consistent with NextGen modernization plans. Historical Circulars influenced by early pioneers like Orville Wright and regulatory milestones such as the establishment of the Civil Aeronautics Board illustrate the evolution of technical guidance.

Legal Status and Regulatory Use

Advisory Circulars are explicitly non-regulatory: they do not have the force of law in the way that Federal Aviation Regulations adopted under the Administrative Procedure Act do. Courts, including the United States Court of Appeals for the Second Circuit and the Federal Circuit, have evaluated their persuasive value in disputes between operators such as Southwest Airlines and the FAA, or in challenges brought by advocacy groups like Public Citizen. While not binding, ACs are frequently used by FAA inspectors, designees like Designated Airworthiness Representatives, and certificate holders to demonstrate compliance with Type Certificate and Supplemental Type Certificate requirements and to streamline certification processes involving firms such as Cessna, Embraer, and Sikorsky Aircraft.

Access, Revision, and Cancellation Procedures

ACs are published and archived for public access on FAA platforms and are updated when superseded by new guidance, consolidated in the agency's records alongside rulemakings and Notices of Proposed Rulemaking that affect stakeholders such as flight schools and aeromedical centers. Revisions follow formal internal clearance, stakeholder comment periods, and may lead to cancellation when guidance becomes obsolete due to technological change, court mandates, or international harmonization with bodies like ICAO and EASA. Cancellation notices and historical versions are tracked for auditability by entities including Government Accountability Office reviewers and congressional oversight committees such as the House Committee on Transportation and Infrastructure.

Category:Aviation publications