MIL-PRF-85676A(AS)
3.4.1.2 Fixed wing and lighter-than-air aircraft.
3.4.1.2.1 General emergency illumination. White floor light shall be provided on
passenger and cargo aircraft in the following locations:
a. 25 in (64 cm) above floor at exit door in flight crew station.
b. Along the center of the main passenger aisle(s) and cross aisle(s) between main aisles.
c. The floor of the passageway leading to each floor level passenger emergency exit,
between the main aisles and the exit openings.
3.4.1.2.2 Exit signs.
3.4.1.2.2.1 Size. Lettering of the word "EXIT" on exit signs shall be red and not less
than 1-1/2 in (38.1 mm) high on illuminated white background. The letter height to stroke width
ratio shall be not more than 7:1 and not less than 6:1. The background shall have an area of not
less than 21 in2 (135.4 cm2) excluding the letters, arrows and symbols.
3.4.1.2.2.2 Location. A sign or signs visible to occupants approaching along the main
passenger aisle(s) shall indicate location of each passenger exit.
a. Exit locator signs shall be located above the aisle(s) near each exit and be internally
illuminated.
b. An exit marking sign shall be located next to each exit and be internally illuminated.
c. Exit signs shall be located on each bulkhead or divider that obstructs fore and aft
vision along the passenger cabin to indicate emergency exits beyond and obscured by the
bulkhead or divider.
d. Stairway location shall be indicated by an exit sign visible to passengers approaching
the main aisle(s) and be internally illuminated.
3.4.1.2.3 Floor proximity escape path marking. Floor proximity emergency escape path
marking shall provide an emergency evacuation path for passengers when all sources of
illumination more than 4 feet above the cabin aisle floor are totally obscured.
3.4.1.3 Aircraft configured to carry only passengers. The geometry of lighting
subassembly components used in aircraft configured to carry only passengers shall conform to
3.4.1.1 and 3.4.1.2 through 3.4.1.2.3.
3.4.2 Single point failure or fuselage break-up. A single point failure in the EELS or
break-up of the fuselage shall not render inoperative more than 25 percent of the required path,
cabin illumination, and exit light, not including those directly destroyed by the break or single
point failure.
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