StacksVerified U.S. regulatory reference

14 CFR §29.505

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
If certification for ski operation is requested, the rotorcraft, with skis, must be designed to withstand the following loading conditions (where P is the maximum static weight on each ski with the rotorcraft at design maximum weight, and n is the limit load factor determined under § 29.473(b)):
  1. (a)Up-load conditions in which—
    1. (1)A vertical load of Pn and a horizontal load of Pn/4 are simultaneously applied at the pedestal bearings; and
    2. (2)A vertical load of 1.33 P is applied at the pedestal bearings.
  2. (b)A side load condition in which a side load of 0.35 Pn is applied at the pedestal bearings in a horizontal plane perpendicular to the centerline of the rotorcraft.
  3. (c)A torque-load condition in which a torque load of 1.33 P (in foot-pounds) is applied to the ski about the vertical axis through the centerline of the pedestal bearings.