Table 1. Recommended Verification Testing Modifications Verification Testing Case Geometry Material Process Foundry Qualification of Process Proof of Product Tests per § 25.621(c)(1) 1 Yes None None None Not necessary Yes Yes 2 2 None Yes None None Yes 1 Yes Yes 2 3 Yes Yes None None Yes Yes Yes 4 None None Yes None Yes 1 Yes Yes 2 5 None None None Yes Yes 1 Yes Yes 2 1 The program described in paragraph 7 of this AC to qualify a new material, process, and foundry combination may not be necessary if the following three conditions exist for the new combination:
1. Sufficient data from relevant castings to show that the process is capable of producing a consistent quality of product, and that the quality is comparable to, or better than, the old combination.
2. Sufficient data from relevant castings to establish that the mechanical properties of the castings produced from the new combination have a similar or better statistical distribution than the old combination.
3. Clearly defined material and process specifications.
2 The casting may be re-qualified by testing partial static test samples. With larger castings, re-qualification could be undertaken by a static test of the casting’s critical region only.
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