MIL-PRF-62321D
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, cadmium, and radioactive material shall not
be used in any part of this vehicle. Radioactive material is defined by Code of Federal
Regulations, Title 10, Parts 30 and 40 and is defined as other radioactive material in which
the specific activity is greater than 0.002 microcuries per gram or the activity per item equals
or exceeds 0.01 microcuries.
3.3 Performance. Performance requirements for 4x4 model vehicles shall be met
with front wheel drive disengaged and with front wheel driving hubs unlocked, except that
vehicles equipped with interaxle compensating devices shall meet performance with front
wheel drive engaged (see 4.1.3).
3.3.1 Speeds and gradeability. High and low speed requirements shall be met with
the vehicle loaded to specified GVW (see 4.1.3).
3.3.1.1 High speed gradeability. The 4x2 and 4x4 model vehicles shall ascend a
continuous grade of 1.5 percent at 50 miles per hour (mph), and 6x4 model vehicles shall
ascend a continuous grade of 0.5 percent at 50 mph. Gradeability requirements shall be met
with the main transmission in direct drive and, when a multispeed axle is furnished, with the
axle in high speed range. Gradeability shall be determined in accordance with SAE J688
(see 4.1.3).
3.3.1.2 Low speed. Low speed for vehicles with a manual transmission shall be
determined with engine operating at not less than 35 percent of recommended governed
speed, and shall provide not more than the vehicle speed specified in table II for
corresponding number of available forward speeds (see 4.1.3).
TABLE II. Vehicle low speed requirement.
Maximum low speed (mph)
Number of forward speeds
4x2 model
4x4 model
6x4 model
4 or 5
4.5
--
--
8
3.5
3
3.0
9 or 10
3
2.5
3.0
13
--
--
2.5
3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed
speed shall be not less than 55 mph for 4x4 model vehicles and 58 mph for all other vehicles
(see 4.1.3).
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