StacksVerified U.S. regulatory reference

14 CFR §25.303

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.