---
kind: "section"
citation: "14 C.F.R. § 29.479"
title: "14"
number: "29.479"
heading: "Level landing conditions."
url: "https://uscodex.org/cfr/14/29.479"
---

# §29.479. Level landing conditions.

- (a) **Attitudes.** Under each of the loading conditions prescribed in [paragraph (b)](#b) of this section, the rotorcraft is assumed to be in each of the following level landing attitudes:
  - (1) **An attitude in which each wheel contacts the ground simultaneously.**
  - (2) An attitude in which the aft wheels contact the ground with the forward wheels just clear of the ground.
- (b) **Loading conditions.** The rotorcraft must be designed for the following landing loading conditions:
  - (1) Vertical loads applied under [§ 29.471](/cfr/14/29.471.md).
  - (2) The loads resulting from a combination of the loads applied under [paragraph (b)(1)](#b-1) of this section with drag loads at each wheel of not less than 25 percent of the vertical load at that wheel.
  - (3) The vertical load at the instant of peak drag load combined with a drag component simulating the forces required to accelerate the wheel rolling assembly up to the specified ground speed, with—
    - (i) The ground speed for determination of the spin-up loads being at least 75 percent of the optimum forward flight speed for minimum rate of descent in autorotation; and
    - (ii) **The loading conditions of paragraph (b) applied to the landing gear and its attaching structure only.**
  - (4) If there are two wheels forward, a distribution of the loads applied to those wheels under paragraphs [(b)(1)](#b-1) and [(2)](#b-2) of this section in a ratio of 40:60.
- (c) **Pitching moments.** Pitching moments are assumed to be resisted by—
  - (1) In the case of the attitude in [paragraph (a)(1)](#a-1) of this section, the forward landing gear; and
  - (2) **In the case of the attitude in paragraph (a)(2) of this section, the angular inertia forces.**

## Notes

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 5084, 29 FR 16150, Dec. 3, 1964, unless otherwise noted.