(a) No tank or reservoir that is part of a system containing flammable
fluids or gases may be in a designated fire zone unless the fluid
contained, the design of the system, the materials used in the tank and
its supports, the shutoff means, and the connections, lines, and controls
provide a degree of safety equal to that which would exist if the tank or
reservoir were outside such a zone.
(b) Each fuel tank must be isolated from the engines by a firewall or
(c) There must be at least one-half inch of clear airspace between each
tank or reservoir and each firewall or shroud isolating a designated fire
zone, unless equivalent means are used to prevent heat transfer from the
fire zone to the flammable fluid.
(d) Absorbent material close to flammable fluid system components that
might leak must be covered or treated to prevent the absorption of
hazardous quantities of fluids.