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United States Department of Transportation United States Department of Transportation

Advisory Circulars (ACs)

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Number, title, description, or office

Advisory Circulars (ACs) search results
Number Title Status Office Date
21-21 Use of Automobile Gasoline in Agricultural Aircraft

Sets forth acceptable conditions under which automobile gasoline (autogas) may be used in restricted category agricultural aircraft powered by Pratt and Whitney R-985 and R-1340 radial engines, and being used in agricultural operations under Federal Aviation Regulations Part 137.

Active ACE-100 1984-08-24
21-40A Guide for Obtaining a Supplemental Type Certificate

Intended as a certification guide and checklist for obtaining a Supplemental Type Certificate (STC).

Active AIR-600 2007-09-27
21-22 Injury Criteria for Human Exposure to Impact

Describes a range of impact trauma which may be used to establish bases for acceptance levels or performance criteria in the evaluation of occupant survivability characteristics in civil aircraft.

Active AIR-120 1985-06-20
21-23B Airworthiness Certification of Civil Aircraft, Engine, Propellers, and Related Products Imported to the United States

Provides information on the Federal Aviation Administration’s (FAA) objectives, regulations, and general practices for the United States of America airworthiness certification or acceptance of civil aeronautical products imported to the U.S.

Active AIR-40 2004-11-17
21-34 Shoulder Harness-Safety Belt Installations

Provides information and guidance pertinent to an acceptable means, but not the only means, for installation of shoulder harness and safety belt restraint systems at all seat locations on all previously type-certificated aircraft.

Active AIR-120 1993-06-04
21-24A Extending a Production Certificate to a Facility Located in a Bilateral Airworthiness Agreement Country

This advisory circular (AC) contains information and guidance concerning Federal Aviation Administration (FAA) production certificate (PC) holders located in the United States that plan 10 extend their PC to include a facility located in another country or jurisdiction.

Active AIR-200 2010-08-06
21-19B Installation of Used Aircraft Engines in New Production Aircraft Active AIR-200 2010-01-29
21-9B Manufacturers Reporting Failures, Malfunctions, or Defects

This advisory circular (AC) provides information about Title 14, Code of Federal Regulations (14 CFR) part 21, Certification Procedures for Products, Articles and Parts (part 21).

Active AIR-200 2010-08-12
21-2L Complying with the Requirements of Importing Countries or Jurisdictions When Exporting U.S. Products, Articles, or Parts

This advisory circular (AC) provides information about Title 14, Code of Federal Regulations (14 CFR) part 21, subpart L.

Active AIR-40 2010-01-29
21-16G RTCA Document DO-160 versions D, E and F, “Environmental Conditions and Test Procedures for Airborne Equipment”

a. This advisory circular (AC) identifies RTCA Document No.

Active AIR-100 2011-06-22
21-12C Application for U.S. Airworthiness Certificate, FAA Form 8130–6

This advisory circular (AC) provides guidance and information needed to prepare and submit Federal Aviation Administration (FAA) Form 8130-6, Application for U.S.

Active AIR-200 2012-09-07
21-52 Obtaining Foreign Design Approval / Acceptance of U.S. Products and Articles

a. This AC provides guidance on obtaining a foreign design approval/acceptance of a U.S. product or article approved under Title 14 of the Code of Federal regulations (14 CFR) part 21.

Active AIR-40 2013-03-07
21-54 Experimental Airworthiness Certification of Certain Former Military Aircraft

This advisory circular (AC) provides information and guidance concerning special airworthiness certification in the experimental category of certain former military aircraft under Title 14 of the Code of Federal Regulations (14 CFR) part 21, Certification Procedures for Products and Parts, §§ 21.191(a), (c), (d), (e); and 21.193.

Active AIR-110 2015-02-15
21-49 Gaining Approval Of Seats With Integrated Electronic Components

a. This AC explains how to gain approval of aircraft seats with integrated electronic components and installed on aircraft.

Active AIR-120 2011-02-09
21-50 Installation of TSOA Articles and LODA Appliances

Describes what you, as an installer, must show in a data package that is presented to the Federal Aviation Administration (FAA) through either a technical standard order authorization (TSOA) or TSO letter of design approval (LODA), under the provisions of Title 14 of the Code of Federal Regulations (14 CFR) part 21.

Active AIR-110 2011-02-11
21-51 Applicant’s Showing of Compliance and Certifying Statement of Compliance

We, the Federal Aviation Administration (FAA), wrote this advisory circular (AC) to describe how to comply with the requirements of Title 14 of the Code of Federal Regulations (14 CFR) 21.20, 21.97 and 21.303(a)(5).

Active AIR-110 2011-09-27
21-31A Quality Control for the Manufacature of Non-Metallic Compartment Interior Components

a. This advisory circular (AC)

1) Provides information about Title 14, Code of Federal Regulations (14 CFR), part 21, Certification Procedures for Products, Articles, and Parts.

Active AIR-200 2010-08-31
21-46A Technical Standard Order Program

This advisory circular (AC) explains the Technical Standard Order (TSO) process outlined in Title 14 of the Code of Federal Regulations (14 CFR) part 21, subpart O, for manufacturers producing articles under a TSO authorization (TSOA) or letter of design approval (LODA).

Active AIR-100 2017-02-23
21-58 Safety Management Systems for Part 21 Type and Production Certificate Holders

This AC provides information to assist certain certificate holders under 14 CFR part 21 in developing, implementing, and maintaining a safety management system (SMS) to meet the regulatory requirements of 14 CFR part 5.

Active AIR-630 2024-04-26
21-28 Airworthiness Certification of U.S.-Produced Aircraft and Engine Kits Assembled Outside the United States

Provides information and guidance concerning airworthiness certification requirements for aircraft or aircraft engines, assembled from kits by aircraft or aircraft engine manufacturers located in other countries.

Active AIR-220 1990-06-20
21-4B Special Flight Permits for Operation of Overweight Aircraft

Furnishes guidance concerning special flight permits necessary to operate an aircraft in excess of its usual maximum certificated takeoff weight.

Active AIR-200 1969-07-30
21-37 Primary Category Aircraft

Provides guidance for complying with Part 21 of Subchapter C, Chapter 1, Title 14 of the Code of Federal Regulations (CFR), which contains the certification procedures for products and parts.

Active AIR-110 1994-06-14
21-13 Standard Airworthiness Certification of Surplus Military Aircraft and Aircraft Built from Spare and Surplus Parts Active AIR-200 1973-04-05
21-47 Submittal Of Data To An ACO, A DER Or An ODA For A Major Repair Or Major Alteration

This advisory circular (AC) provides guidance for creating a complete data package when data is submitted to a Federal Aviation Administration (FAA), aircraft certification office (ACO) or to FAA designees, to support a major repair or major alteration.

Active AIR-100 2010-09-29
21-45 Commercial Parts

This advisory circular (AC) explains how you can use the new provision in Title 14 of the Code of Federal Regulations (14 CFR) §§ 21.1(a)(3), 21.8, 21.9(a)(4), and 21.50(c) for commercial parts.

Active AIR-100 2010-09-29
21-26A Quality Control for the Manufacture of Composite Structures

This advisory circular (AC) provides information about the requirements of Title 14, Code of Federal Regulations (14 CFR) part 21 , Certification Procedures for Products, Articles, and Parts for quality systems for the manufacture of composite structures.

Active AIR-200 2010-07-23
21-44A Issuance of Export Airworthiness Approvals Under 14 CFR Part 21 Subpart L

This advisory circular (AC) provides guidance on how to show compliance with Title 14 of the Code of Federal regulations (14 CFR) part 21, subpart L, Export Airworthiness Approvals.

Active AIR-100 2015-10-01
21-32B Control of Products and Parts Shipped Prior to Type Certificate Issuance

a.

Active AIR-200 2010-08-31
21-55 Process to Support FAA Findings of Undue Burden or No Undue Burden for PAHs Requesting to Use a Manufacturing Facility Located Outside of the United States

This advisory circular (AC) contains information and guidance to production approval holders (PAH) located in the United States requesting Federal Aviation Administration (FAA) approval to use manufacturing facilities located outside of the United States.

Active AIR-100 2016-08-01
21-48 Using Electronic Modeling Systems as Primary Type Design Data

This AC provides information and guidance on developing procedures for using electronic modeling systems in design, manufacture, installation, and inspection processes.

Active AIR-100 2010-10-29
21-43A Production Under 14 CFR Part 21,Subparts F, G, K, and O

This advisory circular (AC) provides information for production approval holders (PAH) pursuant to Title 14 of the Code of Federal Regulations (14 CFR) part 21, Certification Procedures for Products and Articles.

Active AIR-110 2015-10-01
21-25B Approval of Modified Seating System Initially Approved Under a Technical Standard Order

This advisory circular (AC) provides information, clarification, and procedural guidance for the approval and installation of modified technical standard order (TSO)approved seating systems in U.S. type-certificated aircraft.

Active AIR-100 2016-01-11
21-29D Detecting and Reporting Suspected Unapproved Parts

This advisory circular (AC) provides guidance to the aviation community for detecting suspected unapproved parts (SUP) and reporting them to the Federal Aviation Administration (FAA).

Active AIR-600 2016-07-12
21-41A Replacing MIL-S-8879C With SAE AS8879

Provides information, clarification, and procedural guidance concerning the Inactivation of MIL-S-8879Cm Screw Threads, Controlled Radius Root with Increased Minor Diameter, as it relates to the civil aviation industry.

Active AIR-110 2003-06-20