Ground load: unsymmetrical loads on multiple-wheel units.

CFR · 2024-01-01 · US · Title 14

(a) (1) A tandem strut gear arrangement is a multiple-wheel unit; and (2) In determining the total load on a gear unit with respect to the provisions of paragraphs (b) through (f) of this section, the transverse shift in the load centroid, due to unsymmetrical load (b) (1) The number of wheels and their physical arrangements. For truck type landing gear units, the effects of any seesaw motion of the truck during the landing impact must be considered in determining the maximum design loads for the fore and aft wheel pairs. (2) Any differentials in tire diameters resulting from a combination of manufacturing tolerances, tire growth, and tire wear. A maximum tire-diameter differential equal to (3) Any unequal tire inflation pressure, assuming the maximum variation to be ±5 percent of the nominal tire inflation pressure. (4) A runway crown of zero and a runway crown having a convex upward shape that may be approximated by a slope of 1 (5) The airplane attitude. (6) Any structural deflections. (c) (1) The deflation of any one tire for each multiple wheel landing gear unit, and the deflation of any two critical tires for each landing gear unit using four or more wheels per unit, must be considered; and (2) The ground reactions must be applied to the wheels with inflated tires except that, for multiple-wheel gear units with more than one shock strut, a rational distribution of the ground reactions between the deflated and inflated tires, accounting for the differences in shock strut

official document · source cfr-2024 · id 14:§ 25.511