AMC 25.605(b) New fabrication methods -- Test programme

• ED Decision 2021/015/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

AMC 25.605(b) New fabrication methods — Test programme ED Decision 2021/015/R The test programme should initially consider the material strength and other properties resulting from each new fabrication method (‘new’ means new to the industry, an applicant, or an application configuration). The scope of the test programme should include considering the potential for anisotropic properties unless the applicant has already established an understanding of these properties. The test programme that is required for the certification of new fabrication methods should be used to evaluate the critical process variables. Based on that evaluation, the applicant should establish in the fabrication specifications the relevant parameters that govern the final material strength and other properties of the part at the time of its production and throughout its operational life. Furthermore, the applicant should evaluate the sensitivity of the material strength and other properties to the critical process variables to ensure that the established parameters are both robust and practical. Note: the test programme may also be used to help applicants understand the defect types and damage modes to be considered when showing compliance with other specifications, e.g. [CS 25.571](#_DxCrossRefBm1709820942). Understanding the potential defects and damage modes is particularly important for sensitive fabrication processes, e.g. those used for structural bonding. [Amdt No: 25/27]