Safe-Life, Fail-Safe and Damage Tolerant approaches and their relevant material property requirements

For metallic pressurized cabin, wing, empennage, and associated structure in normal, utility, and acrobatic category airplanes, you have the option of the following fatigue evaluation methods:
(1)
A fatigue strength evaluation, more commonly known as a safe-life evaluation. See § 23.571(a) for pressurized cabin and § 23.572(a)(1) for wing, empennage, and associated structure.
(2)
A fail-safe strength evaluation. See § 23.571(b) for pressurized cabin and § 23.572(a)(2) for wing, empennage, and associated structure.
(3)
A damage tolerance evaluation. See § 23.573(b) and § 23.571(c) for pressurized cabin and § 23.572(a)(3) for wing, empennage, and associated structure.

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