fail-safe

This term is defined in ECSS-E-ST-32-01C Rev. 1 as
damage-tolerance design principle, where a structure has redundancy to ensure that failure of one structural element does not cause general failure of the entire structure during the remaining lifetime

This term is defined in ECSS-Q-ST-40C as
design property of a system (or part of it), which prevents its failures from resulting in critical or catastrophic consequences

This term is defined in ECSS-Q-ST-70-46C Rev. 1 as
approach in which the structure is designed with sufficient structural redundancy to ensure that the failure of one structural element does not cause general failure of the entire structure

This term is defined in ECSS-S-ST-00-01C as
preventing the failure of an item from resulting in catastrophic or critical consequences