297 

Federal Aviation Administration, DOT 

§ 25.813 

(l) The emergency lighting system 

must be designed so that after any sin-
gle 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 ren-
dered inoperative, in addition to the 
lights that are directly damaged by the 
separation; 

(2) Each electrically illuminated exit 

sign required under § 25.811(d)(2) re-
mains operative exclusive of those that 
are directly damaged by the separa-
tion; 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] 

§ 25.813

Emergency exit access. 

Each required emergency exit must 

be accessible to the passengers and lo-
cated where it will afford an effective 
means of evacuation. Emergency exit 
distribution must be as uniform as 
practical, taking passenger distribu-
tion 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 pre-
scribed, and the airplane does not have 
a tailcone or ventral emergency exit, 
the floor level exit must be in the rear-
ward part of the passenger compart-
ment, 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 lead-

ing from the nearest main aisle to each 
Type A, Type B, Type C, Type I, or 
Type II emergency exit and between in-
dividual passenger areas. Each passage-
way leading to a Type A or Type B exit 

must be unobstructed and at least 36 
inches wide. Passageways between indi-
vidual passenger areas and those lead-
ing to Type I, Type II, or Type C emer-
gency 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 un-
obstructed 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 near-
est 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 lo-
cated 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 crew-

member(s) to assist in the evacuation 
of passengers must be provided as fol-
lows: 

(1) Each assist space must be a rec-

tangle on the floor, of sufficient size to 
enable a crewmember, standing erect, 
to effectively assist evacuees. The as-
sist space must not reduce the unob-
structed 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 § 25.810(a). 

(3) For each Type C, I or II exit in-

stalled 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 
§ 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 § 25.810(a). 

(5) For any tailcone exit that quali-

fies for 25 additional passenger seats 
under the provisions of § 25.807(g)(9)(ii), 

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