ED Decision 2017/013/R
(a) Unless special or other factors of safety are necessary to meet the requirements of this Subpart, the applicant must determine:
(1) the limit loads, which are equal to the structural design loads; and
(2) the ultimate loads, which are equal to the limit loads multiplied by a 1.5 factor of safety, unless otherwise provided.
(b) Some strength specifications are specified in terms of ultimate loads only, when permanent detrimental deformation is acceptable.
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