Section 25.858

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

(2) There is a separate approved
smoke or fire detector system to give
warning at the pilot or flight engineer
station;
(3) There are means to shut off the
ventilating airflow to, or within, the
compartment, and the controls for
these means are accessible to the flight
crew in the crew compartment;
(4) There are means to exclude hazardous quantities of smoke, flames, or
noxious gases, from the flight crew
compartment; and
(5) The required crew emergency
exits are accessible under any cargo
loading condition.
(f) Class F. A Class F cargo or baggage compartment must be located on
the main deck and is one in which - 
(1) There is a separate approved
smoke detector or fire detector system
to give warning at the pilot or flight
engineer station;
(2) There are means to extinguish or
control a fire without requiring a crewmember to enter the compartment; and
(3) There are means to exclude hazardous quantities of smoke, flames, or
extinguishing agent from any compartment occupied by the crew or passengers.

spaschal on DSK3GDR082PROD with CFR

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-32, 37 FR 3972, Feb. 24,
1972; Amdt. 25-60, 51 FR 18243, May 16, 1986;
Amdt. 25-93, 63 FR 8048, Feb. 17, 1998; Doc.
No. Docket FAA-2014-0001, Amdt. 25-142, 81
FR 7704, Feb. 16, 2016]

Section 25.858 Cargo or baggage compartment smoke or fire detection systems.
If certification with cargo or baggage
compartment smoke or fire detection
provisions is requested, the following
must be met for each cargo or baggage
compartment with those provisions:
(a) The detection system must provide a visual indication to the flight
crew within one minute after the start
of a fire.
(b) The system must be capable of detecting a fire at a temperature significantly below that at which the structural integrity of the airplane is substantially decreased.
(c) There must be means to allow the
crew to check in flight, the functioning
of each fire detector circuit.
(d) The effectiveness of the detection
system must be shown for all approved

operating
tions.

configurations

and

[Amdt. 25-54, 45 FR 60173, Sept. 11, 1980, as
amended by Amdt. 25-93, 63 FR 8048, Feb. 17,
1998]

Section 25.859 Combustion heater fire protection.
(a) Combustion heater fire zones. The
following combustion heater fire zones
must be protected from fire in accordance with the applicable provisions of
SectionSection 25.1181 through 25.1191 and SectionSection 25.1195
through 25.1203;
(1) The region surrounding the heater, if this region contains any flammable fluid system components (excluding 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) The region surrounding the heater, if the heater fuel system has fittings that, if they leaked, would allow
fuel or vapors to enter this region.
(3) The part of the ventilating air
passage that surrounds the combustion
chamber. However, no fire extinguishment is required in cabin ventilating
air passages.
(b) Ventilating air ducts. Each ventilating air duct passing through any
fire zone must be fireproof. In addition - 
(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 constructed or isolated from that system
so that the malfunctioning of any component of that system cannot introduce flammable fluids or vapors into
the ventilating airstream.
(c) Combustion air ducts. Each combustion air duct must be fireproof for a
distance great enough to prevent damage from backfiring or reverse flame
propagation. In addition - 
(1) No combustion air duct may have
a common opening with the ventilating
airstream unless flames from backfires

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