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Low air pressure warning device |
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|  MIL-T-83808
(84)
more than 0.6 seconds, before the tow vehicle service brakes. When a trailer is not attached to the tow
vehicle, the tow vehicle service brakes shall function without delay when the brake service pedal I S
applied. Air shall be modulated, proportional between foot pressure applied to the service brake and air
released to the trailer.
3.3.4.5.1.4 Low air pressure warning d vice. The low air pressure warning device shall actuate a buzzer
e
and warning light located within the cab when the air pressure within the system falls below 90 psi.
3.3.4.5.1.5 Pressure gauge. An air pressure gauge indicating air pressure within the system shall be
installed in the instrument panel area in such a location as to be readily visible to the operator.
3.3.4.5.1.6 Air reservor. The air reservoir capacity shall be not less than 400 cubic inches. A check valve
i
shall be installed between the reservoir tank and the compressor to control the direction of the flow. The
air reservoir shall be protected with a safety valve to prevent hazardous pressures.
3.3.5
F r a m e . Frame shall be properly designed, analyzed and evaluated as to ensure that the
frame's load carrying capacity will be adequate to prevent any stress cracking, warping, etc, during the
life of the vehicle. Frame rails and crossmembers shall have a minimum yield strength of 36,000 psi. The
frame assembly shall be bolted and/or riveted; no welding shall be performed unless certification that the
material has been properly normalized (stress relieved) and its strength has not been degraded is pro-
vided with first article report. No unused holes shall be permitted in the frame rail flanges All unused
holes shall be plugged with tight-fitting fasteners, made of a material that is more ductile than the frame
material. There shall be no point on the frame that, during static loading from the maximum GVW, ex
ceeds 20 percent (safety factor of five) of the yield strength of the frame.
3.3.6
ension. Vehicle shall be equipped with suspension system with components having a
rated capacity at least equal to the load imposed on each member measured at the ground with vehicle
loaded to its GVW. When suspension is rated at the spring pads, unsprung weight shall be deducted.
Vehicle shall be equipped with hydraulic double acting shock absorbers at the front and rear wheels.
Single stage springs, front and rear, shall be furnished The suspension system, in conjunction with tires
selected, must produce a cushioned ride with stability, lack of vehicular bounce and no porpoising while
maintaining good tire contact and traction on the operating surface All four wheels shall remain in contact
at all times on any surface normally used for aircraft operations.
els a nd tires Rim size shall be the same for all wheels on the vehicle Tire size and ply
3.3.7
rating shall be the same for all tires on the vehicle. Wheel and tire ratings shall conform to Tire and Rim
Association recommendations for the size, weight and speed of the tractor. Tubeless tires shall be fur-
nished and shall be truck type. Unless otherwise specified, tires shall have highway tread. When specified
(see 6.2), tires with nondirectional mud and snow tread shall be furnished on the front and rear wheels.
Tires shall be rated for a minimum of 4.5 G static loading without bottoming out.
3 . 3 . 7 . 1 T i r e s c h a i n s . When specified (see 6.2), tire chains shall be provided. At least a three inch
clearance shall be provided for operation with tire chains when the vehicle is loaded to maximum vehicle
weight and the tires are inflated to recommended pressure The chains shall not strike the tractor parts
Installed chains of 5/8 inch deep cross links shall not contact any part of the tractor in any steering mode
at any speed (O -35 MPH) after five minutes of operation to allow chains to expand. This applies to new
or recapped tires This shall be in accordance with SAE J683 Tire chain requirements shall be met even
when tire chains are not provided.
3.3.8
Fuel svstem. The fuel system shall conform to Federal Motor Carrier Safety Regulations
393.65 and 393.67, except compliance with 393.67(c)(1).
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