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6.2.1.2  Some Contracting States may treat repair design as a change in type design, rather than a restoration, and invoke elements of their formal certification process to issue an approval. The difference between these two approaches is in the way Contracting States establish their policy on repair design. As a restoration function, a Contracting State may view a repair design as providing a level of safety as least equal to that established for the product being repaired, even if the design offers an improvement over the original design. Other Contracting States may view that same improvement in a repair design as an upgrading of the level of safety, and therefore treat it as a change in type design. Regardless, the end result of either policy is the approval of a repair design that complies with the applicable airworthiness standards of the State of Registry that issued the Certificate of Airworthiness.
6.2.2 Applicant
6.2.2.1  Any person or organization may apply for approval of a repair design to an aircraft. An applicant may be located within the geographical jurisdiction of a State of Registry (considered a local applicant) or located in another State (considered a foreign applicant). Annexes 6 and 8 make no distinction between local and foreign applicants because the emphasis is on the aircraft operator to ensure that a repair design is approved prior to in the release of an aircraft for return to service. Unlike modification, approval of a repair design usually entails a less intensive airworthiness review, and does not require a strict relationship protocol under Annex 8 to designate a State of Design. Some States of Registry may require a foreign applicant to first obtain their corresponding CAA’s approval of the repair design prior to granting recognition or acceptance for use in their jurisdiction. Contracting States that treat repair design as a design change may have a more restrictive eligibility requirement because of the continuing airworthiness responsibilities assigned to design approval holders.
6.2.2.2  Some States require an individual or organization to first demonstrate competency by formally obtaining accreditation or designation from their CAA as an approved design specialist (known in some States as an approved design organization or individual, or of an equivalent status). This technical capability can be a function of the extent and complexity of the repair design and the nature of the substantiating data needed to establish and demonstrate compliance with the applicable airworthiness standards of the State of Registry. A repair design should not be attempted unless the applicant has a sound knowledge of the design principles embodied in the affected aircraft. There may be cases where access to the analyses and test reports from the original type certification activity of the aeronautical product is needed in order to assess compatibility or suitability of the proposed repair design. If this is the case, it is recommended that the applicant seek ways for the participation in, or review of, the repair design by qualified representatives from the holder of the Type Certificate. Where such cooperation is not available, a State of Registry should establish that the applicant has:
a)  comprehensive knowledge, experience and capabilities in the applicable technologies, such that in-depth analyses can be performed where required; and
b)  sufficient information on the type design of the aircraft involved (if there is any doubt, consultation is suggested with the airworthiness authority of the State of Design).
6.2.3 Application procedure
6.2.3.1 An application for the approval of a repair design should be submitted in a form and manner prescribed, or agreed to, by the CAA, and submitted to the ACD. Information to be submitted on the proposed repair should include, as a minimum, the following:
a)  the name and address of the applicant or operator to which the approval will be issued;
b)  the make and model of the affected aeronautical product (registration and/or serial number) and its Type Certificate number (or approval reference);
　
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