---
kind: "section"
citation: "14 C.F.R. § 29.473"
title: "14"
number: "29.473"
heading: "Ground loading conditions and assumptions."
url: "https://uscodex.org/cfr/14/29.473"
---

# §29.473. Ground loading conditions and assumptions.

- (a) For specified landing conditions, a design maximum weight must be used that is not less than the maximum weight. A rotor lift may be assumed to act through the center of gravity throughout the landing impact. This lift may not exceed two-thirds of the design maximum weight.
- (b) Unless otherwise prescribed, for each specified landing condition, the rotorcraft must be designed for a limit load factor of not less than the limit inertia load factor substantiated under [§ 29.725](/cfr/14/29.725.md).
- (c) Triggering or actuating devices for additional or supplementary energy absorption may not fail under loads established in the tests prescribed in §§ [29.725](/cfr/14/29.725.md) and [29.727](/cfr/14/29.727.md), but the factor of safety prescribed in [§ 29.303](/cfr/14/29.303.md) need not be used.

## Notes

### Amendments

[Amdt. 29-3, 33 FR 966, Jan. 26, 1968]

### 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.

### Amendments

[Amdt. 29-3, 33 FR 966, Jan. 26, 1968]