Title 14 - Aeronautics and Space

Volume: 1Date: 2021-01-01Original Date: 2021-01-01Title: Section Â§ 27.505 - Ski landing conditions.Context:
Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION. SUBCHAPTER C - AIRCRAFT. PART 27 - AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT. Subpart C - Strength Requirements. - Ground Loads.

§ 27.505
Ski landing conditions.
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 § 27.473(b).
(a) Up-load conditions in which—
(1) A vertical load of
Pn
and a horizontal load of
Pn/
4 are simultaneously applied at the pedestal bearings; and
(2) A vertical load of 1.33
P
is applied at the pedestal bearings.
(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.
(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.
Water Loads