Section 121.310

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

have a minimum brightness of at least
160 microlamberts. The color may be
reversed if the passenger compartment
illumination is essentially the same.
On these airplanes, no sign may continue to be used if its luminescence
(brightness) decreases to below 100
microlamberts.
(c) Lighting for interior emergency exit
markings. Except for nontransport category airplanes type certificated after
December 31, 1964, each passenger-carrying airplane must have an emergency
lighting system, independent 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;
(2) Provide enough general lighting
in the passenger cabin so that the average illumination when measured at 40inch intervals at seat armrest height,
on the centerline of the main passenger
aisle, is at least 0.05 foot-candles; and
(3) For airplanes type certificated
after January 1, 1958, after November
26, 1986, include floor proximity emergency escape path marking which
meets the requirements of Section 25.812(e) of
this chapter in effect on November 26,
1984.
(d) Emergency light operation. Except
for lights forming part of emergency
lighting subsystems provided in compliance with Section 25.812(h) 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) of this section must
comply with the following:
(1) Each light must - 
(i) Be operable manually both from
the flightcrew station and, for airplanes on which a flight attendant is
required, 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.
(2) 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.
(4) Each light must have a cockpit
control device that has an  - on, -   - off, - 
and  - armed -  position.
(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
three-fourths inch wide and a head
twice the width of the shaft, extending
along at least 70Section of arc at a radius approximately equal to three-fourths of
the handle length; and
(ii) The word  - open -  in red letters 1
inch high placed horizontally near the
head of the arrow.
(2) For a passenger-carrying airplane
for which the application for the type
certificate was filed on or after May 1,
1972, the location of each passenger
emergency exit operating handle and
instructions for opening the exit must
be shown in accordance with the requirements under which the airplane
was type certificated. On these airplanes, no operating handle or operating handle cover may continue to be
used if its luminescence (brightness)
decreases to below 100 microlamberts.
(f) Emergency exit access. Access to
emergency exits must be provided as

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