---
kind: "section"
citation: "14 C.F.R. § 27.725"
title: "14"
number: "27.725"
heading: "Limit drop test."
url: "https://uscodex.org/cfr/14/27.725"
---

# §27.725. Limit drop test.


The limit drop test must be conducted as follows:

- (a) The drop height must be—
  - (1) 13 inches from the lowest point of the landing gear to the ground; or
  - (2) Any lesser height, not less than eight inches, resulting in a drop contact velocity equal to the greatest probable sinking speed likely to occur at ground contact in normal power-off landings.
- (b) If considered, the rotor lift specified in [§ 27.473(a)](/cfr/14/27.473.md?p=a) must be introduced into the drop test by appropriate energy absorbing devices or by the use of an effective mass.
- (c) Each landing gear unit must be tested in the attitude simulating the landing condition that is most critical from the standpoint of the energy to be absorbed by it.
- (d) When an effective mass is used in showing compliance with [paragraph (b)](#b) of this section, the following formula may be used instead of more rational computations:

## Notes

### Authority

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

### Source

Source: Docket No. 5074, 29 FR 15695, Nov. 24, 1964, unless otherwise noted.