366 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 125, App. A 

accordance with § 125.189. This paragraph 
does not apply to the rear window emergency 
exit of DC–3 airplanes operated with less 
than 36 occupants, including crewmembers, 
and less than five exits authorized for pas-
senger use. 

(b) 

Interior emergency exit marking. 

The fol-

lowing must be complied with for each pas-
senger-carrying airplane: 

(1) Each passenger emergency exit, its 

means of access, and means of opening must 
be conspicuously marked. The identity and 
location of each passenger emergency exit 
must be recognizable from a distance equal 
to the width of the cabin. The location of 
each passenger emergency exit must be indi-
cated by a sign visible to occupants ap-
proaching along the main passenger aisle. 
There must be a locating sign— 

(i) Above the aisle near each over-the-wing 

passenger emergency exit, or at another ceil-
ing location if it is more practical because of 
low headroom; 

(ii) Next to each floor level passenger 

emergency exit, except that one sign may 
serve two such exits if they both can be seen 
readily from that sign; and 

(iii) On each bulkhead or divider that pre-

vents fore and aft vision along the passenger 
cabin, to indicate emergency exits beyond 
and obscured by it, except that if this is not 
possible the sign may be placed at another 
appropriate location. 

(2) Each passenger emergency exit mark-

ing and each locating sign must meet the fol-
lowing: 

(i) For an airplane for which the applica-

tion for the type certificate was filed prior to 
May 1, 1972, each passenger emergency exit 
marking and each locating sign must be 
manufactured to meet the requirements of 
§ 25.812(b) of this chapter in effect on April 30, 
1972. On these airplanes, no sign may con-
tinue to be used if its luminescence (bright-
ness) decreases to below 100 microlamberts. 
The colors may be reversed if it increases the 
emergency illumination of the passenger 
compartment. However, the Administrator 
may authorize deviation from the 2-inch 
background requirements if the Adminis-
trator finds that special circumstances exist 
that make compliance impractical and that 
the proposed deviation provides an equiva-
lent level of safety. 

(ii) For an airplane for which the applica-

tion for the type certificate was filed on or 
after May 1, 1972, each passenger emergency 
exit marking and each locating sign must be 
manufactured to meet the interior emer-
gency exit marking requirements under 
which the airplane was type certificated. On 
these airplanes, no sign may continue to be 
used if its luminescence (brightness) de-
creases to below 250 microlamberts. 

(c) 

Lighting for interior emergency exit mark-

ings. 

Each passenger-carrying airplane must 

have an emergency lighting system, inde-

pendent of the main lighting system. How-
ever, sources of general cabin illumination 
may be common to both the emergency and 
the main lighting systems if the power sup-
ply to the emergency lighting system is 
independent of the power supply to the main 
lighting system. The emergency lighting sys-
tem must— 

(1) Illuminate each passenger exit marking 

and locating sign; and 

(2) Provide enough general lighting in the 

passenger cabin so that the average illu-
mination, when measured at 40-inch inter-
vals at seat armrest height, on the center-
line of the main passenger aisle, is at least 
0.05 foot-candles. 

(d) 

Emergency light operation. 

Except for 

lights forming part of emergency lighting 
subsystems provided in compliance with 
§ 25.812(g) of this chapter (as prescribed in 
paragraph (h) of this section) that serve no 
more than one assist means, are independent 
of the airplane’s main emergency lighting 
systems, and are automatically activated 
when the assist means is deployed, each light 
required by paragraphs (c) and (h) must com-
ply with the following: 

(1) Each light must be operable manually 

and must operate automatically from the 
independent lighting system— 

(i) In a crash landing; or 
(ii) Whenever the airplane’s normal elec-

tric power to the light is interrupted. 

(2) Each light must— 
(i) Be operable manually from the 

flightcrew station and from a point in the 
passenger compartment that is readily ac-
cessible to a normal flight attendant seat; 

(ii) Have a means to prevent inadvertent 

operation of the manual controls; and 

(iii) When armed or turned on at either 

station, remain lighted or become lighted 
upon interruption of the airplane’s normal 
electric power. 

Each light must be armed or turned on 

during taxiing, takeoff, and landing. In 
showing compliance with this paragraph, a 
transverse vertical separation of the fuselage 
need not be considered. 

(3) Each light must provide the required 

level of illumination for at least 10 minutes 
at the critical ambient conditions after 
emergency landing. 

(e) 

Emergency exit operating handles. 

(1) For 

a passenger-carrying airplane for which the 
application for the type certificate was filed 
prior to May 1, 1972, the location of each pas-
senger emergency exit operating handle and 
instructions for opening the exit must be 
shown by a marking on or near the exit that 
is readable from a distance of 30 inches. In 
addition, for each Type I and Type II emer-
gency exit with a locking mechanism re-
leased by rotary motion of the handle, the 
instructions for opening must be shown by— 

(i) A red arrow with a shaft at least 

3

⁄

4

inch 

wide and a head twice the width of the shaft, 

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