KKK-B-1579B
3.5.11.7 Keys. Keys in duplicate for all key-operated locks, properly identified, shall be
safely packed and secured to vehicle steering wheel or otherwise stowed in an approved manner
for shipment. All locks on the same vehicle shall be of same key code except ignition key.
3.5.11.8 Signs. Signs to read "DANGER - DO NOT EXTEND ARMS FROM
WINDOWS" shall be affixed to the interior of the body at not less than four appropriate
locations legible at a distance of 20 feet; one at the front, one at the rear, and one on each side.
3.5.11.9 Standee line. Areas prohibited to standees shall be marked in accordance with
Federal Motor Carrier Safety Regulation 393.90.
3.5.12 Body mounting. Heavy rubber cushions or anti-squeak material shall be utilized
between body frame and attaching chassis parts. Reinforcements or filler blocks shall be used
where mounting devices might otherwise deform frame flanges. Mounting devices shall be
locked units which will minimize loosening but which may be tightened if necessary.
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3.5.13 Air conditioning. When specified (see 6.2), the buses shall be equipped with the
manufacturer's standard independent air conditioning system conforming to 3.5.13.1 through
3.5.13.4.4. The manufacturer shall furnish to the engineering department of the requisitioning
activity the rated capacity of the specified conditions of the entire unit, either by the air
measurement or the flow meter method.
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3.5.13.1 Air conditioning system performance. The air conditioner shall have sufficient
net cooling capacity (Btu per hour) to provide specified cooling. The air conditioner system in a
95°F ambient temperature and in all conditions of solar radiation, shall be capable of maintaining
not more than 80°F dry bulb and a 68°F wet bulb and an effective temperature of 74oF in the bus.
The humidity shall be not less than 30 percent, and not more than 60 percent. The inside
temperature shall be measured 6 inches from the floor, 6 inches ceiling, and at seat level.
Longitudinal measurement shall be taken at the front seat, at the rear seat, and midway of the
passenger area. The inside temperature gradient within the bus shall be not more than 6°F. The
cooling performance specified herein shall be met when the bus is traveling at 50 mph and when
standing still. The air conditioning system shall be independent of the heating system and shall
automatically proportion air in the ratio of 20 percent fresh air to 80 percent recirculated air. All
air shall pass through the filter system.
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