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|  MIL-T-62021E(AT)
3.2.8 Cab-to-axle. The vehicle cab-to-axle dimension shall no be less than 2130 mm
(84 inches).
*
3.2.9 Accessibility. The design of the vehicle and optional equipment shall permit access
for routine servicing and shall permit access for replacement and adjustment of component parts
and accessories with minimal disturbance of other components and systems.
*
3.2.10 Prohibited materials. Asbestos materials shall not be used in any form in any part
of the vehicle. No item, part or assembly shall contain radioactive materials in which the specific
activity is greater than 0.002 microcurie per gram or activity per item equals or exceeds
0.01 microcuries.
3.3 Performance.
3.3.1 Speeds and gradeability. High and low speed requirements shall be met with truck
loaded to specified GVW.
*
3.3.1.1 High speed gradeability. The vehicle shall ascend continuous grades of
2.0 percent at 80 kilometers per hour (km/h) (50 miles per hour (mph)). Gradeability
requirements shall be met with the main transmission in direct drive and, when multispeed axle is
furnished with the axle in high speed range. Gradeability shall be verified with calculations in
accordance with SAE J688 (see 6.3).
*
3.3.1.2 Low speed. Low speed for vehicles with a manual transmission shall be
calculated with engine operating at not less than 35 percent of recommended governed speed, and
shall provide a vehicle speed of not more than 7.2 km/h (4.5 mph).
*
3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed speed
shall be not less than 93 km/h (58 mph). Conformance to geared speed specified shall be
determined by calculations made in accordance with the following formula:
Maximum geared speed (km/h) =
Governed speed (rpm) X 1.609
Total gear reduction x tire factor (see 6.3).
3.3.2 Service brakes. The service brakes shall control and hold the vehicle, when loaded
to its specified GVW, on a 30 percent grade. The service brakes shall stop the vehicle, loaded to
specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety
Regulation 393.52.
3.4 Chassis components.
3.4.1 Engine. The engine furnished shall be the chassis manufacturer's standard or
optional engine for the commercial model truck which meets or exceeds the requirements of this
specification.
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