spaschal on DSK3GDR082PROD with CFR

Section 23.2435

14 CFR Ch. I (1-1-19 Edition)

(1) Be designed and arranged to provide independence between multiple
fuel storage and supply systems so that
failure of any one component in one
system will not result in loss of fuel
storage or supply of another system;
(2) Be designed and arranged to prevent ignition of the fuel within the system by direct lightning strikes or
swept lightning strokes to areas where
such occurrences are highly probable,
or by corona or streamering at fuel
vent outlets;
(3) Provide the fuel necessary to ensure each powerplant and auxiliary
power unit functions properly in all
likely operating conditions;
(4) Provide the flightcrew with a
means to determine the total useable
fuel available and provide uninterrupted supply of that fuel when the
system is correctly operated, accounting for likely fuel fluctuations;
(5) Provide a means to safely remove
or isolate the fuel stored in the system
from the airplane;
(6) Be designed to retain fuel under
all likely operating conditions and
minimize hazards to the occupants during any survivable emergency landing.
For level 4 airplanes, failure due to
overload of the landing system must be
taken into account; and
(7) Prevent hazardous contamination
of the fuel supplied to each powerplant
and auxiliary power unit.
(b) Each fuel storage system must - 
(1) Withstand the loads under likely
operating conditions without failure;
(2) Be isolated from personnel compartments and protected from hazards
due to unintended temperature influences;
(3) Be designed to prevent significant
loss of stored fuel from any vent system due to fuel transfer between fuel
storage or supply systems, or under
likely operating conditions;
(4) Provide fuel for at least one-half
hour of operation at maximum continuous power or thrust; and
(5) Be capable of jettisoning fuel safely if required for landing.
(c) Each fuel storage refilling or recharging system must be designed to - 
(1) Prevent improper refilling or recharging;

(2) Prevent contamination of the fuel
stored during likely operating conditions; and
(3) Prevent the occurrence of any
hazard to the airplane or to persons
during refilling or recharging.
Section 23.2435 Powerplant induction and
exhaust systems.
(a) The air induction system for each
powerplant or auxiliary power unit and
their accessories must - 
(1) Supply the air required by that
powerplant or auxiliary power unit and
its accessories under likely operating
conditions;
(2) Be designed to prevent likely hazards in the event of fire or backfire;
(3) Minimize the ingestion of foreign
matter; and
(4) Provide an alternate intake if
blockage of the primary intake is likely.
(b) The exhaust system, including exhaust heat exchangers for each powerplant or auxiliary power unit, must - 
(1) Provide a means to safely discharge potential harmful material; and
(2) Be designed to prevent likely hazards from heat, corrosion, or blockage.
Section 23.2440 Powerplant fire protection.
(a) A powerplant, auxiliary power
unit, or combustion heater that includes a flammable fluid and an ignition source for that fluid must be installed in a designated fire zone.
(b) Each designated fire zone must
provide a means to isolate and mitigate hazards to the airplane in the
event of fire or overheat within the
zone.
(c) Each component, line, fitting, and
control subject to fire conditions
must - 
(1) Be designed and located to prevent hazards resulting from a fire, including any located adjacent to a designated fire zone that may be affected
by fire within that zone;
(2) Be fire resistant if carrying flammable fluids, gas, or air or required to
operate in event of a fire; and
(3) Be fireproof or enclosed by a fire
proof shield if storing concentrated
flammable fluids.
(d) The applicant must provide a
means to prevent hazardous quantities
of flammable fluids from flowing into,

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