PDF《Airworthiness》

Aircraft Airworthiness Certification Department of Civil Aviation Administration of China (CAAC-AAD) Airworthiness Procedure No.

: AP-21-AA-2014-36 Date: 1/26/2014 How to Establish the Certification Basis for Changed Aeronautical Products How to Establish the Certification Basis for Changed Aeronautical Products 1. Purpose This airworthiness procedure (AP) provide the procedures for determining the certification basis for changes to type certificated products, implementing Chinese Civil Aviation Regulations Part

21 (CCAR-21) §§ 21.19 and 21.101. These procedures apply to design changes made through an amended Type Certificate (TC), a Supplemental Type Certificate (STC), an amended STC, a Modification Design Approval (MDA) or an amended MDA. These procedures also apply to type validation programs of foreign authority. Under this AP, Aircraft Certification Service must apply these procedures to determine the certification basis for changed products. 2. Authority This AC is formulated on the basis of Civil Aviation Products and Parts (CCAR-21). 3. References AP-21-AA-2011-03-R4, Type Certification Procedures AP-21-14, Supplemental Type Certification Procedures AP-21-15, Certification Procedures for Modification Design of Import Civil Aircraft AP-21-01R2, Validation Procedures for Import Civil Aviation Products and Parts AP-21-AA-2009-19, Validation Procedures for USA Aviation Products and TSO Articles AC-21-AA-2014-36, Establishing the Certification Basis of Changed Aeronautical Products 4. Background The general certification procedures for products (aircraft, aircraft engines, and

1 propellers) and parts are in CCAR-21. §§ 21.16 through 21.29, and 21.101 specify certain regulations and the applicable airworthiness standards for type certification of new and changed products. The term changed product C used throughout CCAR-21 and this AP C includes changes that are made through an amended TC, an STC, an amended STC, a MDA or an amended MDA Previous CCAR-21 section

33 required that an applicant for a change to a TC comply with either the regulations cited in the TC or applicable regulations in effect on the date of application, plus any other amendments the Administrator found to be directly related. Current CCAR-21 § 21.101, Designation of applicable regulations , applies to changes in the type design of aircraft, aircraft engines, and propellers, which do not require a new TC under

14 CFR § 21.19. This procedure enhances safety by applying the latest airworthiness standards, to the greatest extent practical, for certifying significant design changes. For validation programs, the validating authority'

s date of application is the date the applicant applied to the certificating authority for the design change. Applicants should consult individual Bilateral Aviation Safety Agreement Implementation Procedures for Airworthiness (BASA IPA) when developing the validation basis for an amended TC, STC, or amended STC program. Under § 21.101(a), a change to a type certificated product must comply with the latest requirements, unless it complies with the exceptions in §§ 21.101(b). The certification basis does not depend on whether the TC holder or an applicant for a STC is originating the change. § 21.101(b) describes criteria for when an applicant can use earlier requirements. Applicants may use earlier requirements when the change is not significant. In cases where design changes involve features that have no adequate regulatory standard in the existing certification basis C but later appropriate regulations exist C the Administrator requires that applicants use appropriate later regulations for the proposed design change. For not significant design changes, the rule allows continued compliance with the existing certification basis, unless there is no adequate regulatory standard in the existing certification basis, without further approval by the Administrator. §§ 21.101(b) 1.(1) and (2) describes the automatic criteria for determining if the change is significant. Under §§ 21.101(b)