Federal Aviation Administration, DOT

Section 25.813

(l) The emergency lighting system
must be designed so that after any single transverse vertical separation of
the fuselage during crash landing - 
(1) Not more than 25 percent of all
electrically illuminated emergency
lights required by this section are rendered inoperative, in addition to the
lights that are directly damaged by the
separation;
(2) Each electrically illuminated exit
sign required under Section 25.811(d)(2) remains operative exclusive of those that
are directly damaged by the separation; and
(3) At least one required exterior
emergency light for each side of the
airplane remains operative exclusive of
those that are directly damaged by the
separation.
[Amdt. 25-15, 32 FR 13265, Sept. 20, 1967, as
amended by Amdt. 25-28, 36 FR 16899, Aug. 26,
1971; Amdt. 25-32, 37 FR 3971, Feb. 24, 1972;
Amdt. 25-46, 43 FR 50597, Oct. 30, 1978; Amdt.
25-58, 49 FR 43186, Oct. 26, 1984; Amdt. 25-88,
61 FR 57958, Nov. 8, 1996; Amdt. 25-116, 69 FR
62788, Oct. 27, 2004; Amdt. 25-128, 74 FR 25645,
May 29, 2009]

spaschal on DSK3GDR082PROD with CFR

Section 25.813

Emergency exit access.

Each required emergency exit must
be accessible to the passengers and located where it will afford an effective
means of evacuation. Emergency exit
distribution must be as uniform as
practical, taking passenger distribution into account; however, the size
and location of exits on both sides of
the cabin need not be symmetrical. If
only one floor level exit per side is prescribed, and the airplane does not have
a tailcone or ventral emergency exit,
the floor level exit must be in the rearward part of the passenger compartment, unless another location affords a
more effective means of passenger
evacuation. Where more than one floor
level exit per side is prescribed, at
least one floor level exit per side must
be located near each end of the cabin,
except that this provision does not
apply to combination cargo/passenger
configurations. In addition - 
(a) There must be a passageway leading from the nearest main aisle to each
Type A, Type B, Type C, Type I, or
Type II emergency exit and between individual passenger areas. Each passageway leading to a Type A or Type B exit

must be unobstructed and at least 36
inches wide. Passageways between individual passenger areas and those leading to Type I, Type II, or Type C emergency exits must be unobstructed and
at least 20 inches wide. Unless there
are two or more main aisles, each Type
A or B exit must be located so that
there is passenger flow along the main
aisle to that exit from both the forward
and aft directions. If two or more main
aisles are provided, there must be unobstructed cross-aisles at least 20
inches wide between main aisles. There
must be - 
(1) A cross-aisle which leads directly
to each passageway between the nearest main aisle and a Type A or B exit;
and
(2) A cross-aisle which leads to the
immediate vicinity of each passageway
between the nearest main aisle and a
Type 1, Type II, or Type III exit; except
that when two Type III exits are located within three passenger rows of
each other, a single cross-aisle may be
used if it leads to the vicinity between
the passageways from the nearest main
aisle to each exit.
(b) Adequate space to allow crewmember(s) to assist in the evacuation
of passengers must be provided as follows:
(1) Each assist space must be a rectangle on the floor, of sufficient size to
enable a crewmember, standing erect,
to effectively assist evacuees. The assist space must not reduce the unobstructed width of the passageway below
that required for the exit.
(2) For each Type A or B exit, assist
space must be provided at each side of
the exit regardless of whether an assist
means is required by Section 25.810(a).
(3) For each Type C, I or II exit installed in an airplane with seating for
more than 80 passengers, an assist
space must be provided at one side of
the passageway regardless of whether
an assist means is required by
Section 25.810(a).
(4) For each Type C, I or II exit, an
assist space must be provided at one
side of the passageway if an assist
means is required by Section 25.810(a).
(5) For any tailcone exit that qualifies for 25 additional passenger seats
under the provisions of Section 25.807(g)(9)(ii),

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