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14 CFR Ch. I (1–1–19 Edition)
§ 135.178
(4) If it is necessary to pass through
a passageway between passenger com-
partments to reach any required emer-
gency exit from any seat in the pas-
senger cabin, the passageway must not
be obstructed. Curtains may, however,
be used if they allow free entry
through the passageway.
(5) No door may be installed in any
partition between passenger compart-
ments.
(6) If it is necessary to pass through
a doorway separating the passenger
cabin from other areas to reach a re-
quired emergency exit from any pas-
senger seat, the door must have a
means to latch it in the open position,
and the door must be latched open dur-
ing each takeoff and landing. The
latching means must be able to with-
stand the loads imposed upon it when
the door is subjected to the ultimate
inertia forces, relative to the sur-
rounding structure, listed in § 25.561(b)
of this chapter.
(g)
Exterior exit markings.
Each pas-
senger emergency exit and the means
of opening that exit from the outside
must be marked on the outside of the
airplane. There must be a 2-inch col-
ored band outlining each passenger
emergency exit on the side of the fuse-
lage. Each outside marking, including
the band, must be readily distinguish-
able from the surrounding fuselage
area by contrast in color. The mark-
ings must comply with the following:
(1) If the reflectance of the darker
color is 15 percent or less, the reflec-
tance of the lighter color must be at
least 45 percent.
(2) If the reflectance of the darker
color is greater than 15 percent, at
least a 30 percent difference between
its reflectance and the reflectance of
the lighter color must be provided.
(3) Exits that are not in the side of
the fuselage must have the external
means of opening and applicable in-
structions marked conspicuously in red
or, if red is inconspicuous against the
background color, in bright chrome
yellow and, when the opening means
for such an exit is located on only one
side of the fuselage, a conspicuous
marking to that effect must be pro-
vided on the other side. ‘‘Reflectance’’
is the ratio of the luminous flux re-
flected by a body to the luminous flux
it receives.
(h)
Exterior emergency lighting and es-
cape route.
(1) Each passenger-carrying
airplane must be equipped with exte-
rior lighting that meets the following
requirements:
(i) For an airplane for which the ap-
plication for the type certificate was
filed prior to May 1, 1972, the require-
ments of § 25.812 (f) and (g) of this chap-
ter in effect on April 30, 1972.
(ii) For an airplane for which the ap-
plication for the type certificate was
filed on or after May 1, 1972, the exte-
rior emergency lighting requirements
under which the airplane was type cer-
tificated.
(2) Each passenger-carrying airplane
must be equipped with a slip-resistant
escape route that meets the following
requirements:
(i) For an airplane for which the ap-
plication for the type certificate was
filed prior to May 1, 1972, the require-
ments of § 25.803(e) of this chapter in ef-
fect on April 30, 1972.
(ii) For an airplane for which the ap-
plication for the type certificate was
filed on or after May 1, 1972, the slip-re-
sistant escape route requirements
under which the airplane was type cer-
tificated.
(i)
Floor level exits.
Each floor level
door or exit in the side of the fuselage
(other than those leading into a cargo
or baggage compartment that is not
accessible from the passenger cabin)
that is 44 or more inches high and 20 or
more inches wide, but not wider than
46 inches, each passenger ventral exit
(except the ventral exits on Martin 404
and Convair 240 airplanes), and each
tail cone exit, must meet the require-
ments of this section for floor level
emergency exits. However, the Admin-
istrator may grant a deviation from
this paragraph if he finds that cir-
cumstances make full compliance im-
practical and that an acceptable level
of safety has been achieved.
(j)
Additional emergency exits.
Ap-
proved emergency exits in the pas-
senger compartments that are in ex-
cess of the minimum number of re-
quired emergency exits must meet all
of the applicable provisions of this sec-
tion, except paragraphs (f) (1), (2), and
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