Text in force at 27-51: from 27-16, effective 1 Dec 1978.
The suitability and durability of materials used for parts, the failure of which could adversely affect safety, must--
[(a) Be established on the basis of experience or tests;
(b) Meet approved specifications that ensure their having the strength and other properties assumed in the design data; and
(c) Take into account the effects of environmental conditions, such as temperature and humidity, expected in service.]
43 FR 50599 · Source