The purpose of this NASA Technical Standard is to establish NASA structural design and test factors, as well as service life factors to be used for spaceflight hardware development and verification. The primary objective of this NASA Technical Standard is to define factors which ensure safe and reliable structural designs. The secondary objective is to reduce space project costs and schedules by enhancing the commonality of use of hardware designs among NASA flight projects, Centers, and their contractors. The criteria in this NASA Technical Standard are to be considered as minimum acceptable values unless adequate engineering risk assessment is provided that justifies the use of lower values. NASA Endorsed. OCE