AMC No 1
to CS 25.603(a) Suitability and durability of materials — Experience
or tests
ED
Decision 2021/015/R
To show
compliance with CS 25.603 and CS 25.605, applicants may use previous applicable
experience and/or tests together with material specifications and material
process specifications. Applicants should therefore carefully consider the
controls on materials and material processing that are appropriate to the
design data to be used for any part (e.g. controls on additive manufacturing
powder material handling processes). However, as material strength and other
properties may result from the process limitations that are specific to the
configuration of some complex parts, the applicability of previous experience
to new part configurations may be limited.
Shared
databases: when the material strength and other properties that are used in
the design data are not only influenced by the constituent materials and/or
material processes, but also by the manufacturing and assembly processes,
demonstrating controls on constituent materials and material processes may
assist applicants in developing the final design data. For example, if an
applicant successfully demonstrates data equivalence with established and
accepted databases, this may create confidence in the applicant’s production
processes, if not providing existing design values.
[Amdt
No: 25/27]
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