Ground loading conditions: landing gear with skids.

CFR · 2024-01-01 · US · Title 14

(a) (1) The design maximum weight, center of gravity, and load factor must be determined under §§ 29.471 through 29.475. (2) Structural yielding of elastic spring members under limit loads is acceptable. (3) Design ultimate loads for elastic spring members need not exceed those obtained in a drop test of the gear with— (i) A drop height of 1.5 times that specified in § 29.725; and (ii) An assumed rotor lift of not more than 1.5 times that used in the limit drop tests prescribed in § 29.725. (4) Compliance with paragraph (b) through (e) of this section must be shown with— (i) The gear in its most critically deflected position for the landing condition being considered; and (ii) The ground reactions rationally distributed along the bottom of the skid tube. (b) (c) (1) The vertical reactions must be combined with horizontal drag reactions of 50 percent of the vertical reaction applied at the ground. (2) The resultant ground loads must equal the vertical load specified in paragraph (b) of this section. (d) (1) The vertical ground reaction must be— (i) Equal to the vertical loads obtained in the condition specified in paragraph (b) of this section; and (ii) Divided equally among the skids. (2) The vertical ground reactions must be combined with a horizontal sideload of 25 percent of their value. (3) The total sideload must be applied equally between skids and along the length of the skids. (4) The unbalanced moments are assumed to be resisted by angular inertia. (5) The skid gear

official document · source cfr-2024 · id 14:§ 29.501