14 CFR 25.1191
§ 25.1191 Firewalls.
United States · 14 CFR — Aeronautics and Space · Status: effective
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- Citation
- 14 CFR 25.1191, § 25.1191 Firewalls, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/54248
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Full text
(a) Each engine, auxiliary power unit, fuel-burning heater, other combustion equipment intended for operation in flight, and the combustion, turbine, and tailpipe sections of turbine engines, must be isolated from the rest of the airplane by firewalls, shrouds, or equivalent means.
(b) Each firewall and shroud must be—
(1) Fireproof;
(2) Constructed so that no hazardous quantity of air, fluid, or flame can pass from the compartment to other parts of the airplane;
(3) Constructed so that each opening is sealed with close fitting fireproof grommets, bushings, or firewall fittings; and
(4) Protected against corrosion.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.