MIL-HDBK-6870B
5.4.9 Capability demonstration.
The capability of nondestructive inspection processes used for production process monitoring and quality control of components should be established, as required by MIL-STD-1530, to mitigate risk of missing defects. Special emphasis should be given inspection processes applied to fracture-critical, fracture-critical traceable and mission-critical parts. If a procedure is required to detect flaws smaller than the accepted capability for the particular method, a capability demonstration should be performed to prove that the technique can reliably detect flaws of that size. Capability demonstrations should also be required for qualification of new inspection processes or technologies prior to implementation. The requirement and approach for conducting capability studies should be addressed within the NDI Program Plan.
6. DETAILED REQUIREMENTS FOR TEST ARTICLES
6.1 First article testing.
Structural components undergoing first article testing should receive, as a minimum, production representative NDI. Additional NDI may be utilized to further quantify the component as part of the first article evaluation.
6.2 Static test articles.
Static test articles will receive, as a minimum, production representative NDI. Additional NDI
may be utilized to further quantify the component post-test.
6.3 Component, full-scale durability test articles.
Structural components undergoing full-scale durability test should receive a production representative NDI prior to test. NDI should be utilized during component and full-scale durability testing. These tests provide a valuable opportunity to verify NDI procedures that may be required to sustain the aircraft. Additionally, the application of NDI during durability tests provides early detection of impending failures which facilitates more accurate determination of the onset of cracking the opportunity to monitor crack growth rates, the development and demonstration of repair concepts and the extension of the test by preventing premature catastrophic failure of the test article. Durability test articles provide an excellent opportunity to evaluate standard and emerging NDI technologies and embedded structural damage sensing (structural health monitoring) systems for use as sustainment tools once the system is fielded.
6.4 Teardown inspections.
NDI should be performed on component and full-scale test durability articles during the teardown inspections that are performed after cyclic testing.
6.5 Flight testing.
NDI should be utilized as required during flight testing to monitor fracture-critical, fracture-critical traceable and mission critical structures where durability and damage tolerance analysis identifies a shortfall. These tests also provide a valuable opportunity to verify NDI procedures that may be required to sustain the aircraft. The NDI procedures that support flight test should be developed considering their eventual inclusion into the sustainment requirements for the system. Inspection procedures developed to support flight test should reference the equipment available to the flight test maintenance organization and be written in accordance with 7.3.1.
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