453 

Federal Aviation Administration, DOT 

§ 25.811 

exit. In the case of assist means in-
stalled at Type C exits, it must be self- 
supporting within 10 seconds from the 
time the opening means of the exits is 
actuated. For all other exit types, it 
must be self-supporting 6 seconds after 
deployment is begun. 

(c) An escape route must be estab-

lished from each overwing emergency 
exit, and (except for flap surfaces suit-
able as slides) covered with a slip re-
sistant surface. Except where a means 
for channeling the flow of evacuees is 
provided— 

(1) The escape route from each Type 

A or Type B passenger emergency exit, 
or any common escape route from two 
Type III passenger emergency exits, 
must be at least 42 inches wide; that 
from any other passenger emergency 
exit must be at least 24 inches wide; 
and 

(2) The escape route surface must 

have a reflectance of at least 80 per-
cent, and must be defined by markings 
with a surface-to-marking contrast 
ratio of at least 5:1. 

(d) Means must be provided to assist 

evacuees to reach the ground for all 
Type C exits located over the wing and, 
if the place on the airplane structure 
at which the escape route required in 
paragraph (c) of this section termi-
nates is more than 6 feet from the 
ground with the airplane on the ground 
and the landing gear extended, for all 
other exit types. 

(1) If the escape route is over the 

flap, the height of the terminal edge 
must be measured with the flap in the 
takeoff or landing position, whichever 
is higher from the ground. 

(2) The assisting means must be usa-

ble and self-supporting with one or 
more landing gear legs collapsed and 
under a 25-knot wind directed from the 
most critical angle. 

(3) The assisting means provided for 

each escape route leading from a Type 
A or B emergency exit must be capable 
of carrying simultaneously two par-
allel lines of evacuees; and, the assist-
ing means leading from any other exit 
type must be capable of carrying as 
many parallel lines of evacuees as 
there are required escape routes. 

(4) The assisting means provided for 

each escape route leading from a Type 
C exit must be automatically erected 

within 10 seconds from the time the 
opening means of the exit is actuated, 
and that provided for the escape route 
leading from any other exit type must 
be automatically erected within 10 sec-
onds after actuation of the erection 
system. 

(e) If an integral stair is installed in 

a passenger entry door that is qualified 
as a passenger emergency exit, the 
stair must be designed so that, under 
the following conditions, the effective-
ness of passenger emergency egress will 
not be impaired: 

(1) The door, integral stair, and oper-

ating mechanism have been subjected 
to the inertia forces specified in 
§ 25.561(b)(3), acting separately relative 
to the surrounding structure. 

(2) The airplane is in the normal 

ground attitude and in each of the atti-
tudes corresponding to collapse of one 
or more legs of the landing gear. 

[Amdt. 25–72, 55 FR 29782, July 20, 1990, as 
amended by Amdt. 25–88, 61 FR 57958, Nov. 8, 
1996; 62 FR 1817, Jan. 13, 1997; Amdt. 25–114, 69 
FR 24502, May 3, 2004] 

§ 25.811

Emergency exit marking. 

(a) Each passenger emergency exit, 

its means of access, and its means of 
opening must be conspicuously 
marked. 

(b) The identity and location of each 

passenger emergency exit must be rec-
ognizable from a distance equal to the 
width of the cabin. 

(c) Means must be provided to assist 

the occupants in locating the exits in 
conditions of dense smoke. 

(d) The location of each passenger 

emergency exit must be indicated by a 
sign visible to occupants approaching 
along the main passenger aisle (or 
aisles). There must be— 

(1) A passenger emergency exit loca-

tor sign above the aisle (or aisles) near 
each passenger emergency exit, or at 
another overhead location if it is more 
practical because of low headroom, ex-
cept that one sign may serve more 
than one exit if each exit can be seen 
readily from the sign; 

(2) A passenger emergency exit mark-

ing sign next to each passenger emer-
gency exit, except that one sign may 
serve two such exits if they both can be 
seen readily from the sign; and 

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