Federal Aviation Administration, DOT

Section 121.310

follows for each passenger-carrying
transport category airplane:
(1) Each passage way between individual passenger areas, or leading to a
Type I or Type II emergency exit, must
be unobstructed and at least 20 inches
wide.
(2) For each Type I or Type II emergency exit equipped with an assist
means, there must be enough space
next to the exit to allow a crewmember
to assist in the evacuation of passengers without reducing the unobstructed width of the passageway below
that required in paragraph (f)(1) of this
section. In addition, all airplanes manufactured on or after November 26, 2008
must comply with the provisions of
SectionSection 25.813(b)(1), (b)(2), (b)(3) and (b)(4) in
effect on November 26, 2004. However, a
deviation from this requirement may
be authorized for an airplane certificated under the provisions of part 4b of
the Civil Air Regulations in effect before December 20, 1951, if the Administrator finds that special circumstances
exist that provide an equivalent level
of safety.
(3) There must be access from the
main aisle to each Type III and Type
IV exit. The access from the aisle to
these exits must not be obstructed by
seats, berths, or other protrusions in a
manner that would reduce the effectiveness of the exit. In addition - 
(i) For an airplane for which the application for the type certificate was
filed prior to May 1, 1972, the access
must meet the requirements of
Section 25.813(c) of this chapter in effect on
April 30, 1972; and
(ii) For an airplane for which the application for the type certificate was
filed on or after May 1, 1972, the access
must meet the emergency exit access
requirements under which the airplane
was type certificated; except that,
(iii) After December 3, 1992, the access for an airplane type certificated
after January 1, 1958, must meet the requirements of Section 25.813(c) of this chapter,
effective June 3, 1992.
(iv) Contrary provisions of this section notwithstanding, the Director of
the division of the Aircraft Certification Service responsible for the airworthiness rules may authorize deviation from the requirements of paragraph (f)(3)(iii) of this section if it is

determined that special circumstances
make compliance impractical. Such
special circumstances include, but are
not limited to, the following conditions
when they preclude achieving compliance with Section 25.813(c)(1)(i) or (ii) without
a reduction in the total number of passenger seats: emergency exits located
in close proximity to each other; fixed
installations such as lavatories, galleys, etc.; permanently mounted bulkheads; an insufficient number of rows
ahead of or behind the exit to enable
compliance without a reduction in the
seat row pitch of more than one inch;
or an insufficient number of such rows
to enable compliance without a reduction in the seat row pitch to less than
30 inches. A request for such grant of
deviation must include credible reasons as to why literal compliance with
Section 25.813(c)(1)(i) or (ii) is impractical and
a description of the steps taken to
achieve a level of safety as close to
that intended by Section 25.813(c)(1)(i) or (ii)
as is practical.
(v) The Director of the division of the
Aircraft Certification Service responsible for the airworthiness rules may
also authorize a compliance date later
than December 3, 1992, if it is determined that special circumstances
make compliance by that date impractical. A request for such grant of deviation must outline the airplanes for
which compliance will be achieved by
December 3, 1992, and include a proposed schedule for incremental compliance of the remaining airplanes in the
operator-s fleet. In addition, the request must include credible reasons
why compliance cannot be achieved
earlier.
(4) If it is necessary to pass through
a passageway between passenger compartments to reach any required emergency exit from any seat in the passenger cabin, the passageway must not
be obstructed. However, curtains may
be used if they allow free entry
through the passageway.
(5) No door may be installed in any
partition between passenger compartments.
(6) No person may operate an airplane manufactured after November 27,
2006, that incorporates a door installed
between any passenger seat occupiable

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