| Ultimate Design Factor | Prototype Test Factor | Proof Test Factor | |
|---|---|---|---|
| Loss of Life or Vehicle | 4.0 | 4.0 | 1.2 |
| All Others | 2.0 | 2.0 | 1.2 |
| 1.4 | 1.6 | 1.2 |
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NASA-STD-5001B, Structural Design and Test Factors of Safety for Spaceflight Hardware
Last Updated 29 Oct 2026
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| Ultimate Design Factor | Prototype Test Factor | Proof Test Factor | |
|---|---|---|---|
| Loss of Life or Vehicle | 4.0 | 4.0 | 1.2 |
| All Others | 2.0 | 2.0 | 1.2 |
| 1.4 | 1.6 | 1.2 |