![]() It also identifies the certification basis for regulatory compliance for the design change. The STC defines the product design change, states how the modification affects the existing type design, and lists serial numbers of the aircraft affected. An STC is less expensive because the design change can be developed by a specialized design organization, a generally more flexible and efficient process than going through the original manufacturer. If the regulatory authority agrees the change does not introduce new risk, the STC option is available. If so, then type design holder must develop and approve a modification to the type design. introduces risk not considered in the first type design). The choice is determined by considering whether or not the change constitutes a new design (i.e. One is to initiate a modification by the type design holder (manufacturer), and the other is to request a third party Supplemental Type Certificate (STC). When changes are needed to an airframe or on-board equipment, there are two options. Examples of regulatory authorities are the Federal Aviation Administration (FAA), the European Aviation Safety Agency (EASA), Transport Canada, Agência Nacional de Aviação Civil and the Civil Aviation Administration of China (CAAC). ![]() The TC reflects a determination made by a regulatory authority that the type design is in compliance with airworthiness requirements. The TC is issued by a regulatory authority, and once issued, the design cannot be changed unless at least part of the process for certification is repeated to cover the changes. 3.4 Supplementary/supplemental type certificate (STC)Ī type certificate (TC) is issued to signify the airworthiness of the approved design or "type" of an aircraft to be manufactured.
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