1.4.2  Validation of Type Certificate
For States that want to perform a review of the approved type design, a validation exercise is highly recommended. The validation of the original Type Certificate issued by the State of Design should generally reduce to one of examination or validation of the type design records and the certification documents held by the State of Design. The validation activity normally includes:
a)  receipt of an application from the Type Certificate holder and State of Design for type certification (or validation);
b)  technical briefing by the applicant and State of Design ACD on the approved type design and certification performed;
c)  an assessment of the adequacy of the airworthiness and environmental Standards applied by the State of Design relative to the requirements of the State of Registry;
d)  an assessment of acceptability of any findings of equivalent level of safety or exemptions granted by the State of Design;
e)  an assessment of suitability of any special conditions of airworthiness specified and certified by the State of Design; and
f)  an assessment of adequacy of the approved type design and compliance demonstration in regard to specified requirements, operating conditions, airworthiness directives, and airworthiness philosophies of the State of Registry.
1.4.2.1  Establishing the certification basis
The intent of the validation process is for the State of Registry to fulfill its national requirements for the issuance of its own Type Certificate, or for the recognition and acceptance of the foreign Type Certificate. An important part of the validation exercise is the identification of differences between the airworthiness requirements that the State of Design required as of the date of original application for a Type Certificate, and those that the State of Registry would have required as of the same date of original application to the State of Design. If differences exist, the State of Registry should establish additional technical requirements to the certification basis of the State of Design to equal its own certification basis. The applicant and State of Design should be notified of the additional technical requirements, including any special conditions of airworthiness to be met (and the assessment of their compliance) and the airworthiness documents (design data, flight manual, etc.) to be submitted for acceptance of the aircraft type by the State of Registry.

1.4.2.2  Establishing the means of compliance
The means of compliance (test, analysis, or description) for the additional technical requirements should be agreed to between the applicant and the State of Registry. The State of Registry may rely on the means of compliance already established by the State of Design for its type certification programme, or request the participation or assistance of the State of Design in establishing a different means of compliance. A certification compliance plan should be developed by the applicant to serve both purposes of project management and record. See guidance in 1.3.3 of this Part, Establishing the Means of Compliance.

1.4.2.3  Demonstration and finding of compliance
1.4.2.3.1 The applicant has responsibility for the demonstration of compliance with the additional technical requirements, while the State of Registry has responsibility for making a finding of compliance. See discussions in 1.3.4 of this Part, Demonstration and Finding of Compliance. The State of Registry may, however, choose to delegate the finding of compliance to the State of Design ACD, through an agreement or authorization. This delegation is a common practice between States of Registry and the State of Design.
1.4.2.3.2 In addition, the State of Design may, upon request from the State of Registry, certify that the product has been examined, tested and found to meet the applicable aircraft noise and engine emissions requirements, including any other requirements the State of Registry has prescribed for that type of aircraft.
　
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