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|  MIL-T-62097C
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3.4.28.1 Engine coolant. The engine coolant shall be a solution of ethylene glycol
antifreeze and water or propylene glycol antifreeze and water, in equal parts of antifreeze and
water by volume. Ethylene glycol antifreeze shall conform to ASTM D4985 with not more than
250 parts per million silicates. Propylene glycol antifreeze shall be in the specific formulation
approved by the engine and cooling system manufacturers. When specified (see 6.2), the
percentage of antifreeze in the cooling system shall be increased to provide protection against
freezing down to -65F.
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3.5 Body. The body shall be built on a forward control chassis and shall have an integral
driver's compartment and enclosed body. An upholstered, bucket type driver's seat with pedestal
shall be furnished. The seat shall be adjustable fore and aft and for height. The driver's seat
pedestal shall be provided with a positive locking mechanism to secure the seat in place when in
use. Body mounting shall be in accordance with the latest edition of the chassis manufacturer's
body builders layout. The body shall be the manufacturer's standard model size unit utilizing a
minimum 178 inch wheelbase (see 3.2.7). When specified (see 6.2), the body shall be
customized in reference to model, size, construction, stowage compartments, and other like
features.
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3.5.1 Construction. The vehicle shall be manufactured in accordance with the highest
standards of the industry. The body shall be custom built as specified. The body design shall
effectively exclude engine fumes and exhaust gases from the interior and shall provide safe and
comfortable transportation for passengers and the driver. The vehicle body shall provide a
comfortable environment for working personnel for extended periods. The body structure shall
be capable of resisting all generally and locally applied loads resulting from normal intended
usage including low speed cross country travel, without excessive deflections, cracking,
permanent deformation, loosening of joints, or premature fatigue failure. Where aluminum and
steel surfaces come into contact, effective means shall be provided to prevent electrolytic action.
All equipment and furnishings shall be secured to withstand mobile vehicle operations.
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3.5.1.1 Structural framing. The body wall, floor and roof shall be of semi-monocoque
construction; or the framing shall be 1-1/2 inch aluminum extrusions of nominal 0.125 inch
thickness or not less than 1-1/2 inches square tubular aluminum or not less than 1-1/4 inches
square tubular high tensile steel. Corners, window frames and door frames shall be reinforced
and gusseted to prevent structural distortion. Wood shall not be used for any primary structural
framing.
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3.5.1.2 Structural floor framing. Floor crossmembers shall be adequately sized to
support the body and payload without fracture or failure under all combinations of expected
loading and shall conform to Federal Motor Carrier Safety Regulation 393.84. Additional
crossmembers shall be provided, if required, to support floor loads in critical stress areas.
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