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|  MIL-T-62518A
3.3.1 Speeds. High and low speed requirements shall be met with the vehicle loaded to
specified GVW.
3.3.1.1 High speed gradeability. The vehicle shall ascend continuous grades specified in
table VIII 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 a multispeed axle
or auxiliary transmission in high speed range. Gradeability shall be verified with calculations in
accordance with SAE J688 (see 6.3).
*
TABLE VIII. Gradeability.
Vehicle class
Percent grade
A
3.0
B
3.0
C
2.5
D
2.0
E
1.5
F
1.1
G
1.0
H
1.0
J
1.0
3.3.1.2 Low speed. Low speed for vehicles with a manual transmission shall be calculated
with the engine operating at not less than 35 percent of the recommended governed speed, and
shall provide a vehicle speed of not more than 6.4 km/h (4 mph).
* 3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed speed shall
be not less than 84 km/h (52 mph) for model 4x4 vehicles and not less than 93 km/h (58 mph) for
model 4x2 and 6x4 vehicles. Conformance to geared speed specified shall be determined by
calculating 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.
* 3.3.3 Upsetting stability. With 1-1/2 times the specified load (see 3.6.5) placed in or
suspended from the aerial basket(s), with the vehicle otherwise unloaded, and with all the
outriggers extended or with the torsion bars on sizes 30 and 35, the articulated booms shall be
capable of placing and holding the loaded aerial basket(s) in any attainable position of the
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