Scope: This Standard establishes common NASA design, development, and test requirements for mechanisms whose operation is required for safety or mission success. It is applicable to space flight mechanisms that are designed, built, or acquired by or for NASA, though it may also serve as a useful guidance document for other systems such as ground support equipment (GSE). Valves, ordnance-actuated mechanical devices, quick-release pins (also known as push in and pull [PIP] pins), threaded interfaces designed to be actuated in service, and interfaces designed to release mechanical degrees of freedom are subject to failure modes typical of mechanisms and are therefore considered mechanisms subject to the requirements of this document. See Appendix A, section A.2.8, for more information on quick release pins. This Standard does not address human factors requirements. Adherence to this Standard does not in and of itself exempt a mechanism from any fault tolerance or hazard control requirements. The requirements and best practices in this Standard may serve as a useful basis for evaluating rationale for variances to fault tolerance requirements that may be proposed for mechanisms.

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