14 CFR § 29.505 - Ski landing conditions.

---
identifier: "/us/cfr/t14/s29.505"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 29.505 - Ski landing conditions."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "29.505"
section_name: "Ski landing conditions."
chapter_name: "FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "AIRCRAFT"
part_number: "29"
part_name: "AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704."
regulatory_source: "Docket No. 5084, 29 FR 16150, Dec. 3, 1964, unless otherwise noted."
cfr_part: "29"
---


# 29.505 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 § 29.473(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.