2 ton, multi-fuel engine driven, six-wheel six-wheel drive, military design truck chassis, trucks, and truck tractors.

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MIL-T-46780D(AT)

Table VII. 20,000 mile test for truck tractors

in combination with applicable semitrailers

Course Mileage & speeds Vehicle loading

Hard surface

12,000 miles at varying speed up to maximum

Highway payload

(see Table XIV)

Secondary

4,850 miles at speeds applicable

Limited Cross-Country

to conditions of terrain

payload (see

Table XIV)

Level and hilly

cross-country

3,000 miles at speeds applicable

to conditions of terrain

Limited cross-country

payload (see

Belgian block

150 miles at speeds applicable

Table XIV)

Limited cross-country

to conditions of terrain

payload (see

Table XIV)

Table VIII. 11 400 mile test for van models

Course Mileage & speeds Vehicle loading

Hard surface

Secondary

Level and hilly cross-country

Belgian block

7,500 miles at varying speed up to maximum

1,525 miles at speeds applicable

to conditions of terrain

2,275 miles at speeds applicable

to conditions of terrain

100 miles at speeds applicable

Highway payload

(see Table XIV) Highway payload

(see Table XIV) Limited cross-country

and Cross-county

(see Table XIV)

Cross-country

to conditions of terrain (see Table XIV) NOTE: Fifty percent of the test specified in Tables VI and VII shall be performed with

applicable towed loads.

4.1.5.4.1 Reliability verification. To determine conformance to 3.1.1, reliability requirements will be verified at a 50% confidence level while the vehicle is subjected to first production vehicle test. The Mean Miles Between Failure (MMBF) shall not be less than specified.

4.1.5.4.2 Durability verification. To determine conformance to 3.1.2, the durability requirements will be verified at a 50% confidence level while the vehicle is subjected to first production vehicles test.

4.1.5.4.3 Maintainability verification. To determine conformance to 3.1.3, the maintainability requirements will be verified during first production vehicle test.