ASD-STAN prEN 9255 (02/05/2018)

The purpose of this DOA standard is to define generic requirements and methods for the acceptance of supplier's design capabilities and management of Design Organisation authorisations to suppliers performing design activities and/or tasks on behalf of DOAH. This European standard covers all suppliers as soon as they produce deliverables related to the design of parts or appliances (e.g. design data, compliance documents for certification activities, etc.) and/or perform the associated tasks (e.g. classification of changes to TC, execution of laboratory tests for development or compliance demonstration and associated test data results collection and documentation). Any designing of parts or appliances or any execution of associated tasks performed by persons not directly employed by the DOAH should be considered as work being subcontracted, and therefore could be eligible to the cascade of authorisation as defined in this European standard (refer to Table 1 in 1.2). Examples of tasks which can be subcontracted are: - laboratory testing, test set-up and/or inspection; - design data and drawings; - stress analysis; - qualification of software/equipment; - instructions for continued airworthiness. Examples of tasks which can be delegated are: - technical endorsement of laboratory testing, test set-up and/or inspection; - technical endorsement of design data and drawings; - technical endorsement of stress analysis; - technical endorsement of qualification of software/equipment; - classification of changes and approval of minor changes at product level; - classification of repairs and approval of minor repairs at product level; - technical endorsement of Instructions for continued airworthiness. This European standard is applicable for: - initial design during product development (type certificate/STC/RTC process): subcontractor's contribution to the preparation of compliance documents to be used by TC/STC applicant in the frame of the certification activities; - changes to the type certificate/STC/RTC; - repairs; - engineering decision over unintentional manufacturing deviations.