14 CFR · Part 33
14 CFR § 33.15
Materials.
The suitability and durability of materials used in the engine must—
(a)
Be established on the basis of experience or tests; and
(b)
Conform to approved specifications (such as industry or military specifications) that ensure their having the strength and other properties assumed in the design data.
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
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