190
14 CFR Ch. I (1–1–24 Edition)
§ 23.2440
(b) The exhaust system, including ex-
haust heat exchangers for each power-
plant or auxiliary power unit, must—
(1) Provide a means to safely dis-
charge potential harmful material; and
(2) Be designed to prevent likely haz-
ards from heat, corrosion, or blockage.
§ 23.2440
Powerplant fire protection.
(a) A powerplant, auxiliary power
unit, or combustion heater that in-
cludes a flammable fluid and an igni-
tion source for that fluid must be in-
stalled in a designated fire zone.
(b) Each designated fire zone must
provide a means to isolate and miti-
gate 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 pre-
vent hazards resulting from a fire, in-
cluding any located adjacent to a des-
ignated fire zone that may be affected
by fire within that zone;
(2) Be fire-resistant if carrying flam-
mable fluid, gas or air, or is required to
operate in the 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,
within or through each designated fire
zone. This means must—
(1) Not restrict flow or limit oper-
ation of any remaining powerplant or
auxiliary power unit, or equipment
necessary for safety;
(2) Prevent inadvertent operation;
and
(3) Be located outside the fire zone
unless an equal degree of safety is pro-
vided with a means inside the fire zone.
(e) A means to ensure the prompt de-
tection of fire must be provided for
each designated fire zone—
(1) On a multiengine airplane where
detection will mitigate likely hazards
to the airplane; or
(2) That contains a fire extinguisher.
(f) A means to extinguish fire within
a fire zone, except a combustion heater
fire zone, must be provided for—
(1) Any fire zone located outside the
pilot’s view;
(2) Any fire zone embedded within the
fuselage, which must also include a re-
dundant means to extinguish fire; and
(3) Any fire zone on a level 4 airplane.
[Doc. No. FAA–2015–1621, Amdt. 23–64, 81 FR
96689, Dec. 30, 2016, as amended by Doc. No.
FAA–2022–1355, Amdt. 23–65, 87 FR 75710, Dec.
9, 2022]
Subpart F—Equipment
§ 23.2500
Airplane level systems re-
quirements.
This section applies generally to in-
stalled equipment and systems unless a
section of this part imposes require-
ments for a specific piece of equipment,
system, or systems.
(a) The equipment and systems re-
quired for an airplane to operate safely
in the kinds of operations for which
certification is requested (Day VFR,
Night VFR, IFR) must be designed and
installed to—
(1) Meet the level of safety applicable
to the certification and performance
level of the airplane; and
(2) Perform their intended function
throughout the operating and environ-
mental limits for which the airplane is
certificated.
(b) The systems and equipment not
covered by paragraph (a) of this sec-
tion—considered separately and in re-
lation to other systems—must be de-
signed and installed so their operation
does not have an adverse effect on the
airplane or its occupants.
[Doc. No. FAA–2015–1621, Amdt. 23–64, 81 FR
96689, Dec. 30, 2016, as amended by Doc. No.
FAA–2022–1355, Amdt. 23–65, 87 FR 75710, Dec.
9, 2022]
§ 23.2505
Function and installation.
When installed, each item of equip-
ment must function as intended.
§ 23.2510
Equipment, systems, and in-
stallations.
For any airplane system or equip-
ment whose failure or abnormal oper-
ation has not been specifically ad-
dressed by another requirement in this
part, the applicant must design and in-
stall each system and equipment, such
that there is a logical and acceptable
inverse relationship between the aver-
age probability and the severity of fail-
ure conditions to the extent that:
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