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
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
21-2L 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
21-52 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