Combustion heater fire protection.

CFR · 2024-01-01 · US · Title 14

(a) (1) The region surrounding any heater, if that region contains any flammable fluid system components (including the heater fuel system), that could— (i) Be damaged by heater malfunctioning; or (ii) Allow flammable fluids or vapors to reach the heater in case of leakage. (2) Each part of any ventilating air passage that— (i) Surrounds the combustion chamber; and (ii) Would not contain (without damage to other rotorcraft components) any fire that may occur within the passage. (b) (1) Unless isolation is provided by fireproof valves or by equally effective means, the ventilating air duct downstream of each heater must be fireproof for a distance great enough to ensure that any fire originating in the heater can be contained in the duct; and (2) Each part of any ventilating duct passing through any region having a flammable fluid system must be so constructed or isolated from that system that the malfunctioning of any component of that system cannot introduce flammable fluids or vapors into the ventilating airstream. (c) (1) No combustion air duct may communicate with the ventilating airstream unless flames from backfires or reverse burning cannot enter the ventilating airstream under any operating condition, including reverse flow or malfunction of the heater or its associated components; and (2) No combustion air duct may restrict the prompt relief of any backfire that, if so restricted, could cause heater failure. (d) (e) (1) Means independent of the components provided fo

official document · source cfr-2024 · id 14:§ 29.859