---
kind: "section"
citation: "14 C.F.R. § 25.303"
title: "14"
number: "25.303"
heading: "Factor of safety."
url: "https://uscodex.org/cfr/14/25.303"
---

# §25.303. Factor of safety.


Unless otherwise specified, a factor of safety of 1.5 must be applied to the prescribed limit load which are considered external loads on the structure. When a loading condition is prescribed in terms of ultimate loads, a factor of safety need not be applied unless otherwise specified.


## Notes

### Amendments

[Amdt. 25-23, 35 FR 5672, Apr. 8, 1970]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702 and 44704; Pub. L. 115-254, 132 Stat 3281 (49 U.S.C. 44903 note).

### Source

Source: Docket No. 5066, 29 FR 18291, Dec. 24, 1964, unless otherwise noted.

### Amendments

[Amdt. 25-23, 35 FR 5672, Apr. 8, 1970]