Section 121.223

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

There must be a hand fire extinguisher
available for each Class A compartment.
(c) Class B. Cargo and baggage compartments are classified in the  - B - 
category if enough access is provided
while in flight to enable a member of
the crew to effectively reach all of the
compartment and its contents with a
hand fire extinguisher and the compartment is so designed that, when the
access provisions are being used, no
hazardous amount of smoke, flames, or
extinguishing agent enters any compartment occupied by the crew or passengers. Each Class B compartment
must comply with the following:
(1) It must have a separate approved
smoke or fire detector system to give
warning at the pilot or flight engineer
station.
(2) There must be a hand fire extinguisher available for the compartment.
(3) It must be lined with fire-resistant material, except that additional
service lining of flame-resistant material may be used.
(d) Class C. Cargo and baggage compartments are classified in the  - C -  category if they do not conform with the
requirements for the  - A - ,  - B - ,  - D - , or
 - E -  categories. Each Class C compartment must comply with the following:
(1) It must have a separate approved
smoke or fire detector system to give
warning at the pilot or flight engineer
station.
(2) It must have an approved built-in
fire-extinguishing system controlled
from the pilot or flight engineer station.
(3) It must be designed to exclude
hazardous quantities of smoke, flames,
or extinguishing agents from entering
into any compartment occupied by the
crew or passengers.
(4) It must have ventilation and draft
controlled so that the extinguishing
agent provided can control any fire
that may start in the compartment.
(5) It must be lined with fire-resistant material, except that additional
service lining of flame-resistant material may be used.
(e) Class D. Cargo and baggage compartments are classified in the  - D - 
category if they are so designed and
constructed that a fire occurring therein will be completely confined without

endangering the safety of the airplane
or the occupants. Each Class D compartment must comply with the following:
(1) It must have a means to exclude
hazardous quantities of smoke, flames,
or noxious gases from entering any
compartment occupied by the crew or
passengers.
(2) Ventilation and drafts must be
controlled within each compartment so
that any fire likely to occur in the
compartment will not progress beyond
safe limits.
(3) It must be completely lined with
fire-resistant material.
(4) Consideration must be given to
the effect of heat within the compartment on adjacent critical parts of the
airplane.
(f) Class E. On airplanes used for the
carriage of cargo only, the cabin area
may be classified as a Class  - E -  compartment. Each Class E compartment
must comply with the following:
(1) It must be completely lined with
fire-resistant material.
(2) It must have a separate system of
an approved type smoke or fire detector to give warning at the pilot or
flight engineer station.
(3) It must have a means to shut off
the ventilating air flow to or within
the compartment and the controls for
that means must be accessible to the
flight crew in the crew compartment.
(4) It must have a means to exclude
hazardous quantities of smoke, flames,
or noxious gases from entering the
flight crew compartment.
(5) Required crew emergency exits
must be accessible under all cargo
loading conditions.
Section 121.223 Proof of compliance with
Section 121.221.
Compliance with those provisions of
Section 121.221 that refer to compartment accessibility, the entry of hazardous
quantities of smoke or extinguishing
agent into compartments occupied by
the crew or passengers, and the dissipation of the extinguishing agent in Class
 - C -  compartments must be shown by
tests in flight. During these tests it
must be shown that no inadvertent operation of smoke or fire detectors in
other compartments within the airplane would occur as a result of fire

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