Text in force at CAR3R-8: from CAR3R-0, effective 15 May 1956. OCR text
(a) Fire walls and shrouds shall be constructed in such a manner that no hazardous quantity of liquids, gases, or flame could pass from the engine compartment to other portions of the airplane. All openings in the fire wall or shroud shall be sealed tight with fireProof grommets, bushings, or fire-wall fittings, except that, such seals of fireresistant materials shall be acceptable for use on single-engine airplanes and multiengine airplanes not required to comply with § 3.85 (b) or § 3.85a (b), if such airplanes are equipped with engine(s) having a volumetric displacement of 1.000 cubic inches or less: and if the openings in the fire walls or shrouds are such that, without seals, the passage of a hazardous quantity of flame could not result.
(b) Fire walls and shrouds shall be constructed of fireproof material and shall be protected against corrosion. The following materials have been found to comply with this requirement:
(1) Heat- and = corrosion-resistant steel 0.015 inch thick, (2) Low carbon steel, suitably protected against corrosion, 0.018 inch thick.