Federal Aviation Administration, DOT

Section 23.2515

within or through each designated fire
zone. This means must - 
(1) Not restrict flow or limit operation 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 provided with a means inside the fire zone.
(e) A means to ensure the prompt detection 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 redundant means to extinguish fire; and
(3) Any fire zone on a level 4 airplane.

Subpart F - Equipment

spaschal on DSK3GDR082PROD with CFR

Section 23.2500 Airplane
quirements.

level

systems

re-

This section applies generally to installed equipment and systems unless a
section of this part imposes requirements for a specific piece of equipment,
system, or systems.
(a) The equipment and systems required 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 environmental limits for which the airplane is
certificated.
(b) The systems and equipment not
covered by paragraph (a), considered
separately and in relation to other systems, must be designed and installed so
their operation does not have an adverse effect on the airplane or its occupants.

Section 23.2505

Function and installation.

When installed, each item of equipment must function as intended.
Section 23.2510 Equipment, systems, and installations.
For any airplane system or equipment whose failure or abnormal operation has not been specifically addressed by another requirement in this
part, the applicant must design and install each system and equipment, such
that there is a logical and acceptable
inverse relationship between the average probability and the severity of failure conditions to the extent that:
(a) Each catastrophic failure condition is extremely improbable;
(b) Each hazardous failure condition
is extremely remote; and
(c) Each major failure condition is
remote.
Section 23.2515 Electrical and electronic system lightning protection.
An airplane approved for IFR operations must meet the following requirements, unless an applicant shows
that exposure to lightning is unlikely:
(a) Each electrical or electronic system that performs a function, the failure of which would prevent the continued safe flight and landing of the airplane, must be designed and installed
such that - 
(1) The function at the airplane level
is not adversely affected during and
after the time the airplane is exposed
to lightning; and
(2) The system recovers normal operation of that function in a timely manner after the airplane is exposed to
lightning unless the system-s recovery
conflicts with other operational or
functional requirements of the system.
(b) Each electrical and electronic
system that performs a function, the
failure of which would significantly reduce the capability of the airplane or
the ability of the flightcrew to respond
to an adverse operating condition,
must be designed and installed such
that the system recovers normal operation of that function in a timely manner after the airplane is exposed to
lightning.

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