Federal Aviation Administration, DOT

Section 25.795

(3) Cargo compartment fire suppression.
An extinguishing agent must be capable of suppressing a fire. All cargocompartment fire suppression systems
must be designed to withstand the following effects, including support structure displacements or adjacent materials displacing against the distribution system:
(i) Impact or damage from a 0.5-inch
diameter aluminum sphere traveling at
430 feet per second (131.1 meters per
second);
(ii) A 15-pound per square-inch (103.4
kPa) pressure load if the projected surface area of the component is greater
than 4 square feet. Any single dimension greater than 4 feet (1.22 meters)
may be assumed to be 4 feet (1.22 meters) in length; and
(iii) A 6-inch (0.152 meters) displacement, except where limited by the fuselage contour, from a single point
force applied anywhere along the distribution system where relative movement between the system and its attachment can occur.
(iv) Paragraphs (b)(3)(i) through (iii)
of this section do not apply to components that are redundant and separated
in accordance with paragraph (c)(2) of
this section or are installed remotely
from the cargo compartment.
(c) An airplane with a maximum certificated passenger seating capacity of
more than 60 persons or a maximum
certificated takeoff gross weight of
over 100,000 pounds (45,359 Kilograms)
must comply with the following:
(1) Least risk bomb location. An airplane must be designed with a designated location where a bomb or other
explosive device could be placed to best
protect flight-critical structures and
systems from damage in the case of
detonation.
(2) Survivability of systems. (i) Except
where impracticable, redundant airplane systems necessary for continued
safe flight and landing must be physically separated, at a minimum, by an
amount equal to a sphere of diameter

( H 0 / )

(where H0 is defined under Section 25.365(e)(2)
of this part and D need not exceed 5.05
feet (1.54 meters)). The sphere is applied everywhere within the fuselage - 

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D=2

limited by the forward bulkhead and
the aft bulkhead of the passenger cabin
and cargo compartment beyond which
only one-half the sphere is applied.
(ii) Where compliance with paragraph
(c)(2)(i) of this section is impracticable,
other design precautions must be taken
to maximize the survivability of those
systems.
(3) Interior design to facilitate searches.
Design features must be incorporated
that will deter concealment or promote
discovery of weapons, explosives, or
other objects from a simple inspection
in the following areas of the airplane
cabin:
(i) Areas above the overhead bins
must be designed to prevent objects
from being hidden from view in a simple search from the aisle. Designs that
prevent concealment of objects with
volumes 20 cubic inches and greater
satisfy this requirement.
(ii) Toilets must be designed to prevent the passage of solid objects greater than 2.0 inches in diameter.
(iii) Life preservers or their storage
locations must be designed so that
tampering is evident.
(d) Each chemical oxygen generator
or its installation must be designed to
be secure from deliberate manipulation
by one of the following:
(1) By providing effective resistance
to tampering,
(2) By providing an effective combination of resistance to tampering and
active tamper-evident features,
(3) By installation in a location or
manner whereby any attempt to access
the generator would be immediately
obvious, or
(4) By a combination of approaches
specified in paragraphs (d)(1), (d)(2) and
(d)(3) of this section that the Administrator finds provides a secure installation.
(e) Exceptions. Airplanes used solely
to transport cargo only need to meet
the requirements of paragraphs (b)(1),
(b)(3), and (c)(2) of this section.
(f) Material Incorporated by Reference.
You must use National Institute of
Justice (NIJ) Standard 0101.04, Ballistic
Resistance of Personal Body Armor,
June 2001, Revision A, to establish ballistic resistance as required by paragraph (a)(3) of this section.