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§ 29.551
Auxiliary lifting surfaces.
Each auxiliary lifting surface must be designed to withstand—
(a) The critical flight loads in §§ 29.337 through 29.341, and 29.351;
(b) the applicable ground loads in §§ 29.235, 29.471 through 29.485, 29.493, 29.505, and 29.521; and
(c) Any other critical condition expected in normal operation.