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5.2.2.4  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 proposed design change and the nature of the substantiating data needed to establish and demonstrate compliance of the proposed modification with the applicable airworthiness and environmental standards. The design of major modifications to aircraft, engines or propellers should not be attempted unless the applicant has a sound knowledge of the design principles embodied in the aeronautical product being considered for modification. 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 design change. If this is the case, it is recommended that the applicant seek ways for the participation in, or review and comment on, the modification design by qualified representatives from the holder of the Type Certificate. Where such cooperation is not available, the responsible airworthiness authority should not approve the modification design unless it is confident 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).
5.2.3   Application for approval
An application for the approval of a proposed modification should be submitted in a form and manner prescribed by the CAA, and submitted to the ACD. Information on the proposed modification should include, as a minimum, the following:
a)  the name and address of the applicant 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);
c)  the title, detailed description, and purpose of the proposed modification, including any changes affecting the noise and emissions level of the aircraft or engine;
d)  the type of approval requested (see guidance in Section 5.4.5.3 of this Part, Issuance of Approval);
e)  the proposed airworthiness standards, including environmental standards if applicable, to which the proposed modification is designed and with which it is intended to comply:
f)  documentation and/or substantiating data of the design change;
g)  for a local applicant, an indication on the need for a concurrent or subsequent approval by another State, and;
h)  for a foreign applicant, evidence of prior approval by the State that has jurisdiction over the individual or organization responsible for the modification.
Note.— Some States of Registry require a foreign applicant to submit their application through their CAA, who then makes an application on their behalf. This procedure ensures that the State of Design is aware of the application and their corresponding responsibilities on continuing airworthiness under Annex 8 if the modification is eventually approved by a State of Registry.
5.2.4   Validity period of an application
An application for an amendment of a Type Certificate or issuance of a Supplemental Type Certificate is normally subjected to a validity period prescribed by the CAA, within which the approval of the modification should be completed. For other forms of approval, a validity period may also apply, or not be applicable, depending on CAA policy. The validity period starts from the date of application up to a pre-determined number of years, the exact number being commensurate to the complexity of the review and approval of the proposed modification. For example, many States have a validity period of five years for applications involving modifications to large transport aircraft, and three years for modifications to engine or propellers. In cases where an applicant can show that his proposed modification requires a longer period for design, development, and testing, the CAA can approve a longer validity period. Or, if during the approval process the CAA believes that the approval will not be issued by the end of the validity period, the applicant should be requested to submit a new application or apply for an extension of the validity period. As a consequence of any extension granted to an applicant, the certification basis of the proposed modification should be reviewed again for currency or validity. The CAA and applicant should jointly review the potential impact or consequence of their extended validity period when requesting foreign validation of their modification.
　
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