(a) Except as noted in § 1919.1 and as provided in exemptions under § 1919.10(h), certification performed by accredited persons shall conform to the requirements contained in this subpart.

(b) Safe working loads assigned to assembled units of gear, shall be based on applicable design criteria acceptable to the accredited person. Where no design data on which to base a rating is obtainable, the safe working load ratings assigned shall be based on the owner's information and warranty that those so assigned are correct. Unit test certificates shall state the basis for any such safe working load assignment.