Federal Aviation Administration, DOT

Section 121.313

requirements pertaining to seat cushions in Section 25.853(c) effective on November
26, 1984, on each airplane as follows:
(1) Each transport category airplane
type certificated after January 1, 1958;
and
(2) On or after December 20, 2010,
each nontransport category airplane
type certificated after December 31,
1964.
(c) All interior materials; airplanes type
certificated in accordance with SFAR No.
41 of 14 CFR part 21. No person may operate an airplane that conforms to an
amended or supplemental type certificate issued in accordance with SFAR
No. 41 of 14 CFR part 21 for a maximum
certificated takeoff weight in excess of
12,500 pounds unless the airplane meets
the compartment interior requirements set forth in Section 25.853(a) in effect
March 6, 1995 (formerly Section 25.853(a), (b),
(b-1), (b-2), and (b-3) of this chapter in
effect on September 26, 1978)(see app. L
of this part).
(d) All interior materials; other airplanes. For each material or seat cushion to which a requirement in paragraphs (a), (b), or (c) of this section
does not apply, the material and seat
cushion in each compartment used by
the crewmembers and passengers must
meet the applicable requirement under
which the airplane was type certificated.
(e) Thermal/acoustic insulation materials. For transport category airplanes type certificated after January
1, 1958:
(1) For airplanes manufactured before
September 2, 2005, when thermal/acoustic insulation is installed in the fuselage as replacements after September
2, 2005, the insulation must meet the
flame propagation requirements of
Section 25.856 of this chapter, effective September 2, 2003, if it is:
(i) Of a blanket construction or
(ii) Installed around air ducting.
(2) For airplanes manufactured after
September 2, 2005, thermal/acoustic insulation materials installed in the fuselage must meet the flame propagation requirements of Section 25.856 of this
chapter, effective September 2, 2003.
(3) For airplanes with a passenger capacity of 20 or greater, manufactured
after September 2, 2009, thermal/acoustic insulation materials installed in

the lower half of the fuselage must
meet the flame penetration resistance
requirements of Section 25.856 of this chapter,
effective September 2, 2003.
[Doc. No. 28154, 60 FR 65930, Dec. 20, 1995, as
amended by Amdt. 121-301, 68 FR 45083, July
31, 2003; Amdt. 121-320, 70 FR 77752, Dec. 30,
2005; Amdt. 121-330, 72 FR 1442, Jan. 12, 2007;
Docket FAA-2018-0119, Amdt. 121-380, 83 FR
9173, Mar. 5, 2018]

Section 121.313

Miscellaneous equipment.

No person may conduct any operation unless the following equipment is
installed in the airplane:
(a) If protective fuses are installed on
an airplane, the number of spare fuses
approved for that airplane and appropriately described in the certificate
holder-s manual.
(b) A windshield wiper or equivalent
for each pilot station.
(c) A power supply and distribution
system that meets the requirements of
SectionSection 25.1309, 25.1331, 25.1351(a) and (b)(1)
through (4), 25.1353, 25.1355, and
25.1431(b) or that is able to produce and
distribute the load for the required instruments and equipment, with use of
an external power supply if any one
power source or component of the
power distribution system fails. The
use of common elements in the system
may be approved if the Administrator
finds that they are designed to be reasonably protected against malfunctioning. Engine-driven sources of energy, when used, must be on separate
engines.
(d) A means for indicating the adequacy of the power being supplied to
required flight instruments.
(e) Two independent static pressure
systems, vented to the outside atmospheric pressure so that they will be
least affected by air flow variation or
moisture or other foreign matter, and
installed so as to be airtight except for
the vent. When a means is provided for
transferring an instrument from its
primary operating system to an alternate system, the means must include a
positive positioning control and must
be marked to indicate clearly which
system is being used.
(f) A door between the passenger and
pilot compartments (i.e., flightdeck
door), with a locking means to prevent
passengers from opening it without the

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