StacksVerified U.S. regulatory reference

14 CFR §25.1455

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
If fluids subject to freezing may be drained overboard in flight or during ground operation, the drains must be designed and located to prevent the formation of hazardous quantities of ice on the airplane as a result of the drainage.