KKK-B-1579B
3.5.4 Sides and roof. Sides and roof shall have sheet metal outer panels, lined on the
inside and integrated with body structure.
3.5.4.1 Exterior. Sides shall be full-skirted and equipped with two full-length rub rails
extending along each side of the body, one below platform level and one approximately at seat
height. Seat height rub rail shall extend across rear to within 6 inches or less of emergency door.
3.5.4.2 Interior. Body interior, including sides, roof and front and rear ends, shall be
fully lined with sheet metal panels.
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3.5.4.3 Insulation. Non settling, fungus resistant, fire retardant, insulation shall be
installed in roof, side, and end walls. In addition, material shall be applied to the inner
(not exposed) surfaces of exterior panels and other exterior sheet metal as added insulation and
to prevent drumming. Insulation shall have a K factor of not more than
.15 Btu/sq. ft./deg. F/hr./in. thickness.
3.5.4.4 Designation-sign compartment. When specified (see 6.2), designation sign
compartment shall be installed at front center of roof above windshield. Compartment shall
provide not less than 180 square inches of glass-enclosed frontal area, of a height to permit
reading of 6-inch letters on the sign roller and shall be readily accessible, through latched door,
from inside the bus. Compartment shall be illuminated to permit reading of destination sign at
night. Destination sign shall be a roller type of a capacity to apply 15 listings of 6-inch high
letters and shall be operable from interior of bus, unless otherwise specified, destination sign roll
will be furnished blank.
3.5.5 Doors. Two doors shall be provided in the bus, unless otherwise specified, service
door shall be at the front on the side opposite the driving controls, for use by entering and
departing passengers. Emergency exit door shall be located in rear. Each door shall be provided
with effective compression or overlapping seals to minimize entry of dust, water, and cold air.
When specified (see 6.2), the service door shall be located on left side of bus, behind the driver is
seat and forward of the rear axle for buses to be used in certain overseas areas. Reduction of
seating capacity up to and including four adults or six children is acceptable.
3.5.5.1 Service door. Service door shall be of two leaf-type with manual control
conveniently located for driver operation. Service door shall be provided with upper and lower
safety glass panels. Operating linkage shall be installed within the body or enclosed to preclude
accumulation of mud, ice, and snow. Minimum dimensions of clear opening shall be 24 by
74 inches, unobstructed by door seals or door operating mechanisms.
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