287 

Federal Aviation Administration, DOT 

§ 25.795 

(3) 

Cargo compartment fire suppression. 

An extinguishing agent must be capa-
ble of suppressing a fire. All cargo- 
compartment fire suppression systems 
must be designed to withstand the fol-
lowing effects, including support struc-
ture displacements or adjacent mate-
rials displacing against the distribu-
tion 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 sur-
face area of the component is greater 
than 4 square feet. Any single dimen-
sion greater than 4 feet (1.22 meters) 
may be assumed to be 4 feet (1.22 me-
ters) in length; and 

(iii) A 6-inch (0.152 meters) displace-

ment, except where limited by the fu-
selage contour, from a single point 
force applied anywhere along the dis-
tribution system where relative move-
ment between the system and its at-
tachment can occur. 

(iv) Paragraphs (b)(3)(i) through (iii) 

of this section do not apply to compo-
nents 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 cer-

tificated 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 air-

plane must be designed with a des-
ignated 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 air-
plane systems necessary for continued 
safe flight and landing must be phys-
ically separated, at a minimum, by an 
amount equal to a sphere of diameter 

D

H

=

(

)

2

0

/

π

(where H

0

is defined under § 25.365(e)(2) 

of this part and D need not exceed 5.05 
feet (1.54 meters)). The sphere is ap-
plied everywhere within the fuselage— 

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 sim-
ple 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 pre-

vent the passage of solid objects great-
er 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 com-

bination 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 Adminis-
trator finds provides a secure installa-
tion. 

(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 bal-
listic resistance as required by para-
graph (a)(3) of this section. 

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