Text in force at 23-63: from 23-0, effective 1 Feb 1965.
(a) Rib tests must simulate the conditions in the airplane with respect to--
(1) Torsional rigidity of spars;
(2) Fixity conditions;
(3) Lateral supports; and
(4) Attachment to spars.
(b) The effects of ailerons and high lift devices must be accounted for.
29 FR 17955 · Source