scope:

Purpose.

a. This order defines the procedures to establish the certification basis for changed aeronautical products pursuant to 14 CFR 21.101, Designation of applicable regulations. This order also defines if it will be necessary to apply for a new TC under § 21.19, Changes requiring a new type certificate.

b. This order applies to major type design changes for aeronautical products certified pursuant to 14 CFR parts 21, 23, 25, 27, 29, 31, 33, and 35. References to "design change" include the design change and areas affected by the design change pursuant to § 21.101. For other acronyms, definitions, and terminology referred to in this order, see Appendix A.

c. This order also applies to design changes made to aircraft certificated pursuant to §§ 21.17(b), 21.19, 21.24, 21.25, 21.27, and 21.29.

d. Do not use this order to determine the applicable aircraft noise, fuel venting, and exhaust emission requirements for changed products. Information for approval of noise and emissions can be found in 14 CFR parts 34 and 36.

e. The general certification procedures for products (aircraft, aircraft engines, and propellers) and articles are defined in 14 CFR part 21. Subpart B, Type Certificates, and Subpart D, Changes to Type Certificates, of 14 CFR part 21 specify procedural regulations and references to the applicable airworthiness standards for type certification of new products and changes in product type design. The procedures found in § 21.101, which are defined in this order, describe the process for establishing the certification basis for an amended TC, supplemental type certificate (STC), and amended STC, detailing the requirements (evaluations, classifications, and decisions) made throughout the process.

f. For the purpose of this document, all references to design changes and areas affected by the design changes are considered amendments made to an aeronautical product's type design.