Pt. 125, App. A

14 CFR Ch. I (1-1-19 Edition)

accordance with Section 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 passenger use.
(b) Interior emergency exit marking. The following must be complied with for each passenger-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 indicated by a sign visible to occupants approaching 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 ceiling 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 prevents 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 marking and each locating sign must meet the following:
(i) For an airplane for which the application 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
Section 25.812(b) of this chapter in effect on April 30,
1972. On these airplanes, no sign may continue to be used if its luminescence (brightness) 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 Administrator finds that special circumstances exist
that make compliance impractical and that
the proposed deviation provides an equivalent level of safety.
(ii) For an airplane for which the application 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 emergency exit marking requirements under
which the airplane was type certificated. On
these airplanes, no sign may continue to be
used if its luminescence (brightness) decreases to below 250 microlamberts.
(c) Lighting for interior emergency exit markings. Each passenger-carrying airplane must
have an emergency lighting system, inde-

pendent of the main lighting system. However, sources of general cabin illumination
may be common to both the emergency and
the main lighting systems if the power supply to the emergency lighting system is
independent of the power supply to the main
lighting system. The emergency lighting system must - 
(1) Illuminate each passenger exit marking
and locating sign; and
(2) Provide enough general lighting in the
passenger cabin so that the average illumination, when measured at 40-inch intervals at seat armrest height, on the centerline 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
Section 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 comply 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 electric 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 accessible 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 passenger 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 emergency exit with a locking mechanism released 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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