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United States Department of Transportation United States Department of Transportation

Advisory Circulars (ACs)

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Advisory Circulars (ACs) search results
Number Title Status Office Date
20-186A Airworthiness and Operational Approval of Cockpit Voice Recorder Systems

This advisory circular (AC) provides guidance for gaining airworthiness approval for cockpit voice recorder (CVR) systems.

Active AFS-300 2024-05-06
20-105C Reciprocating Engine Power-Loss Accident Prevention and Trend Monitoring

This AC discusses the circumstances surrounding engine power-loss accidents. It provides recommendations on how, through individual effort and consideration, those accidents can be prevented.

Active AFS-300 2023-12-18
20-97B Aircraft Tire Maintenance and Operational Practices with Change 1

This advisory circular (AC) provides recommended tire care and maintenance practices needed to assure the safety of support personnel and the continued airworthiness of aircraft.

Active AFS-300 2005-04-18
20-154A Guide for Developing a Receiving Inspection System for Aircraft Parts and Materials

This AC provides guidance and information for developing a receiving inspection system and for incorporation into a person’s existing receiving inspection system to help prevent the introduction of unairworthy articles into inventories.

Active AFS-300 2024-07-03
20-142 Eligibility and Evaluation of U.S. Military Surplus Flight Safety Aircraft Parts, Engines, and Propellers

This advisory circular (AC) provides information and guidance for use in evaluating and determining the eligibility of U.S. military surplus flight safety critical aircraft parts (FSCAP), engines, and propellers for installation on Federal Aviation Administration (FAA) type-certificated products.

Active AFS-300 2000-02-25
20-77B Use of Manufacturers’ Maintenance Manuals

This advisory circular (AC) informs owners and operators about the usefulness of manufacturer’s maintenance manuals for servicing, repairing, and maintaining aircraft, engines, and propellers.

Active AFS-300 2016-01-04
20-62E Eligibility, Quality, & Identification of Aeronautical Replacement Parts

This advisory circular (AC) provides information and guidance for use in determining the quality, eligibility and traceability of aeronautical parts and materials intended for installation on U.S. type-certificated (TC) products and articles, and to enable compliance with the applicable regulations.

Active AFS-300 2018-09-14
20-109B Service Difficulty Reporting System (Air Operator/Air Agency/General Aviation/Unmanned Aircraft Systems)

This AC describes methods the Administrator prescribes per Title 14 of the Code of Federal Regulations (14 CFR) part 91, § 91.1415; part 125, § 125.409; and part 135, § 135.415; and accepts per part 121, § 121.703 and part 145, § 145.221 for reporting in-service product and article failures, malfunctions, and defects.

Active AFS-300 2023-11-01