§ 121.247 - Fire-wall construction.

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Each fire wall and shroud must—

Be so made that no hazardous quantity of air, fluids, or flame can pass from the engine compartment to other parts of the airplane;

Have all openings in the fire wall or shroud sealed with close-fitting fire-proof grommets, bushings, or firewall fittings;

Be made of fireproof material; and

Be protected against corrosion.