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6.1.2 An aircraft will experience accidental damage, wear and tear, environmental deterioration, fatigue, malfunction, and failure during its operational life. Repair is a corrective action intended to restore an aircraft back to its approved type design and, is regarded primarily as a maintenance function. If a repair design is needed, the State of Registry has an obligation under Annex 8 to approve the repair design, as a way of ensuring that the aircraft will continue to comply with the design aspects of the airworthiness standards used for the type certification of that aircraft. An unapproved repair design could render a Certificate of Airworthiness invalid for international flights. The relationship between repair to an approved type design and the Certificate of Airworthiness is explained further by the following three
(3) requirements that form part of several general provisions on Maintenance in Annex 6:
a)  An operator must ensure that the Certificates of Airworthiness on aircraft they operate remain valid.
b)  An operator must keep records of appropriate details of repairs incorporated on aircraft.
c)  Repairs shall comply with the airworthiness requirements of the State of Registry, and procedures shall be established to ensure the substantiating data supporting compliance with the airworthiness requirements are retained.
6.1.3 Accomplishing a repair on an aircraft may involve such actions as performing maintenance or servicing procedures, replacing a defective part with a like serviceable unit or with an approved substitute part, or designing and incorporating a repair scheme. Generally, the documents encompassing the instructions for continued airworthiness (ICA) such as, but not limited to, maintenance manuals, servicing instructions, overhaul manuals, and repair manuals contain adequate maintenance procedures that are recognized by Contracting States as either approved or acceptable for purposes of accomplishing repairs to aircraft. For example, a structural repair manual contains several State of Design-approved repair schemes for typical damages or structural failures that can be readily applied by an operator, without the need for obtaining prior approval of the CAA. However, where the repair action specifically requires designing a repair scheme, the repair design (data) must be approved or accepted by the CAA prior to the release of an aircraft for return to service.
6.1.4 Approving a repair design prior to the release of an aircraft for return to service can be processed in many ways, depending on the scope and complexity of the proposed repair and the regulatory system in place for each Contracting State. The approval of repairs may be a function delegated by a Contracting States to authorized persons or organizations, while other Contracting States exercise it as their exclusive function. Some repair approvals are limited to the approval of the design data only, whereas other approvals may also constitute installation approval. Regardless, the approval process is intended to verify that the repair design complies with the airworthiness requirements of the State of Registry for the purpose of maintaining validity of a Certificate of Airworthiness issued under Annex 8.
6.1.5 All Contracting States, regardless of their approval procedures, are encouraged to give maximum credit and recognition to the repair design approvals granted by the State of Design, or another Contracting State with a demonstrated technical capability, and avoid duplicate or redundant evaluation where practical, and without prejudice to their own unique national requirements.
6.2 Application for approval of repair design
6.2.1 General
6.2.1.1  An applicant requesting approval of a repair design can be the owner or operator of an aircraft, a Type Certificate holder, a maintenance, repair and overhaul facility, an original equipment manufacturer for components and parts, a specialized engineering organization, or an individual engineer acting as a consultant, or, where allowed by a State, their representatives. An applicant is the organization or individual that has responsibility for the repair design, and whose name the approval will be granted. Neither Annex 6 nor 8 requires the aircraft operator to be the holder of the repair design approval, but only to ensure that the repair design is approved and specifically applicable to the affected aircraft.
　
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