Skip to page content

USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

United States Department of Transportation United States Department of Transportation

Advisory Circulars (ACs)

Search Results

Number, title, description, or office

Advisory Circulars (ACs) search results
Number Title Status Office Date
20-148 Reusable Software Components

This advisory circular (AC) provides one acceptable means of compliance, but not the only means, for reusable software component (RSC) developers, integrators, and applicants to gain: • The Federal Aviation Administration’s (FAA) “acceptance” of a software component that may be only a part of an airborne system’s software applications and intended functions

Active AIR-100 2004-12-07
20-33B Technical Information Regarding Civil Aeronautics Manuals 1, 3, 4a, 4b, 5, 6, 7, 8, 9, 13, and 14

Advises the public that policy information contained in the subject Civil Aeronautics Manuals may be used in conjunction with specific sections of the Federal Aviation Regulations.

Active AIR-100 1975-05-01
20-163 Displaying Geometric Altitude Relative to Mean Sea Level

a. This advisory circular (AC) shows you how to gain a type certificate (TC), supplemental TC (STC), amended TC (ATC), amended supplemental TC (ASTC), or technical standard order (TSO) authorization for systems incorporating the presentation of geometric altitude relative to mean sea level (MSL) on electronic displays.

Active AIR-100 2009-07-09
20-107B Composite Aircraft Structure

This AC sets forth an acceptable means, but not the only means of showing compliance with the provisions of Title 14 of the Code of Federal Regulations (14 CFR) parts 23, 25, 27, and 29 regarding airworthiness type certification requirements for composite aircraft structures involving fiber reinforced materials, e.g., carbon and glass fiber reinforced plastics.

Active AIR-100 2009-09-08
45-2E Identification and Registration Marking

This advisory circular (AC) provides information about Title 14, Code of Federal Regulations (14 CFR), part 45, Identification and Registration Marking.

Active AIR-100 2015-10-01
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
00-69 The title is Best Practices for Airborne Software Development Assurance Using EUROCAE ED-12( ) and RTCA DO-178( )

This advisory circular (AC) provides information in the form of “best practices” and, as such, is not intended as guidance but rather as complementary information to ED-12C/DO-178C (and related documents) and AC 20-115D.

Active AIR-100 2017-07-21
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
21.101-1B Establishing the Certification Basis of Changed Aeronautical Products

This advisory circular (AC) provides guidance for the application ofthe "Changed Product Rule (CPR)," pursuant to Title 14 ofthe Code ofFederal Regulations (14 CFR) 21.101, Designation ofapplicable regulations, and 21.19, Changes requiring a new type certificate, for changes made to type certificated aeronautical products.

Active AIR-100 2016-03-11
20-164A Designing and Demonstrating Aircraft Tolerance to Portable Electronic Devices

This advisory circular (AC) identifies RTCA, Inc., document DO-307A, Aircraft Design and Certification for Portable Electronic Device (PED) Tolerance, dated December 15, 2016, as an acceptable means for designing and demonstrating aircraft toleranceto potential electromagnetic interference from portable electronic devices (PEDs).

Active AIR-100 2017-06-09
20-156 Aviation Databus Assurance

a. This advisory circular (AC) is for aircraft and aircraft engine manufacturers anddesigners. We provide a means to gain Federal Aviation Administration (FAA) approval of your aviation databus by showing the databus design performs its intended function and satisfies the applicable airworthiness requirements when installed on an aircraft or aircraft engine.

Active AIR-100 2006-08-04
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
21-48 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
21-47 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
20-169 Guidance for Certification of Military and Special Mission Modifications and Equipment for Commercial Derivative Aircraft (CDA)

This advisory circular (AC) provides guidance for the certification of commercial derivative aircraft (CDA).

Active AIR-100 2010-09-30
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
39-10 Alternative Methods of Compliance

This advisory circular (AC) presents guidance for persons seeking approval of an alternativemethod of compliance (AMOC) to an airworthiness directive (AD).

Active AIR-100 2016-09-14
39-8 Continued Airworthiness Assessments of Powerplant and Auxiliary Power Unit Installations of Transport Category Airplanes

Describes the Continued Airworthiness Assessment Methodologies (CAAM). The Federal Aviation Administration (FAA) Engine and Propeller Directorate (EPD) and the Transport Airplane Directorate (TAD) may use CAAM to identify unsafe conditions and determine when an “unsafe condition is likely to exist or develop in other products of the same type design” before prescribing corrective action in accordance with Title 14 of the Code of Federal Regulations (14 CFR) part 39.

Active AIR-100 2003-09-08
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
20-178 Flammability Testing of Aircraft Cabin Interior Panels After Alterations

This advisory circular (AC) describes acceptable methods to test aircraft cabin interior materials when new finishes are used on existing aircraft cabin interior panels, typically performed on supplemental type certificates (STC) or major alterations.

Active AIR-100 2012-06-04
20-149B Installation Guidance for Domestic Flight Information Service- Broadcast

This advisory circular (AC) supports the use of Flight Information Services-Broadcast (FIS-B) weather and other aeronautical data link products for enhanced situation awareness of flight conditions.

Active AIR-100 2015-12-21
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
20-151C Airworthiness Approval of Traffic Alert and Collision Avoidance Systems (TCAS II), Versions 7.0 & 7.1 and Associated Mode S Transponders

We wrote this advisory circular (AC) to guide applicants seeking airworthiness approval for TCAS II version 7.1 (V7.1) certified to technical standard order (TSO) C119c, TSO-C119d or TSO-C119e, Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment, TCAS II with Hybrid Surveillance.

Active AIR-100 2017-07-21