Text in force at 29-59: from 29-0, effective 1 Feb 1965.
Each auxiliary lifting surface must be designed to withstand--
(a) The critical flight loads in Secs. 29.337 through 29.341, and 29.351;
(b) The applicable ground loads in Secs. 29.235, 29.471 through 29.485, 29.493, 29.505, and 29.521; and
(c) Any other critical condition expected in normal operation.
29 FR 16150 · Source