| NB: The definitions below are for words, or technical vocabulary, specific to Military Air Environment use. |
| Where a word appears in the Oxford English Dictionary (OED), the definition below is specific only to the |
| associated context and OED definitions should be used in all other usages. |
| Term | Abbreviation | Chapter Reference |
| Safe life | Chap 11.2 |
| Description |
| For an aircraft designed to be retired before fatigue cracking occurs, this is the period of operation during which |
| the risk of cracking occurring is acceptably low (Tech-Cert-ASI). |