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Number Office Title Date
21.17-2A ACE-100 Type Certification-Fixed Wing Gliders (Sailplanes), Including Powered Gliders Provides information and guidance concerning acceptable means of showing compliance with Section 21.17(b) of Part 21 of the Federal Aviation Regulations (FAR) for type certification of gliders and powered gliders. General guidance relative to glider type certification is also provided. 02-10-1993
21.17-3 AIR-110 Type Certification of Very Light Airplanes Under FAR 21.17(b) Provides a means but not the only means for the type, production, and airworthiness certification of very light airplanes (VLA); and designates the “Joint Aviation Requirements for Very Light Aeroplanes” (JAR-VLA), issued April 25, 1990, by the Joint Aviation Authorities (FAA) of Europe as an acceptable airworthiness criteria that provides in equivalent level of safety under FAR 21.17(b) for Federal Aviation Administration (FAA) type certification of VLA as a special class of aircraft. Provides other acceptable uses of the JAR-VLA in the United States aircraft certification regulatory system. 12-21-1992
21.25-1 ACE-111 Issuance of Type Certificate: Restricted Category Agricultural Airplanes Provides information and guidance for obtaining a type certificate in the restricted category under Title 14 of the Code of Federal Regulations (14 CFR) Part 21, Section 21.25, for small single-engine piston and turbo-propeller driven airplanes, which will be used for agricultural special purpose operations. It also provides an acceptable means, but not the only means, of meeting the requirements of 14 CFR part 21 for the issuance of a type certificate in the restricted category. 12-01-1997
21.303-4 AIR-110 Application for Parts Manufacturer Approval Via Tests and Computations or Identicality

a.  This advisory circular (AC) updates the Federal Aviation Administration’s (FAA) guidance to applicants for parts manufacturer approval (PMA) of articles via tests and computations or identicality without a license agreement.  This AC cites regulations in Title 14, Code of Federal Regulations (14 CFR) part 21, Subpart K that became effective April 16, 2011.  In addition, this AC provides a convenient application and compliance checklist, adds a certifying statement of compliance, provides guidance for assessing an article’s impact on safety and describes how the FAA approves replacement parts for technical standard order (TSO) articles.  This AC does not apply to the articles that are listed in 14 CFR 21.9(a)(1) through (6).

b.  This AC refers to parts and components as articles per 14 CFR 21.1.  This section defines an article as a material, part, component, process or appliance.  These items may include sealants, modified standard parts, brake assemblies, etc. that are in a product’s type design.  Please note PMA is not for base materials, processes or inspection procedures.

c.  This AC is not mandatory and does not constitute a regulation. This AC describes an acceptable means, but not the only means, to comply with 14 CFR Part 21, Subpart K.  If you chose to use any of these best practices, we expect you to follow it completely.  Adherence to the guidance for each applicable facet will show that an article’s design complies with the airworthiness requirements of its eligible products.  Also consult other ACs when you need guidance on product specific requirements for showing compliance.  For example, AC 33-8 has guidance for Parts Manufacturer Approval of Turbine Engine and Auxiliary Power Unit Parts under Test and Computation.

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