Text in force at CS23-6: from CS23-5, effective 15 Aug 2017.
(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.
ED Decision 2017/013/R · Source