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)

4.3.2.7 Waterproofness van bodies check. To determine conformance to 3.3.10.1, each vehicle selected shall have the van body subjected to not less than 15 minutes spray test. The spray shall be delivered by nozzles operating at 25 pounds (minimum) per square inch (PSI)

water pressure, sufficient in number to afford full coverage of the roof, floor, sides, front and rear

of body. Nozzles shall be placed within two feet of area being tested. During water test all doors and windows shall be closed. If leaks occur within the van body, the vehicle shall be rejected until defects have been corrected and van body retested with above procedure.

4.3.2.7.1 Light proofness check van bodies. To determine conformance to 3.3.10.2, each van body with access door closed and blackout shades down, shall be placed in bright sunlight or exposed to high intensity illumination. No light shall be visible inside van body. The test shall

be repeated at night with all sources of illumination operating within the van body. No light

shall be visible outside of van body.

4.3.2.8 Performance operational tests (all type vehicle). To determine conformance to

3.4, during the 50 mile road test the vehicle shall meet performance requirements of 3.4.3,

3.4.3.1, 3.4.3.2, 3.4.4.2 through 3.4.5.2 and 3.4.8 through 3.4.9. In addition, to determine there will be no loosening or shifting of the body and its component as specified in 3.3.9, the M756A2 w/w truck test is to include not less than 15 abrupt stops from a speed of 25 MPH in forward direction, not less than 5 abrupt stops from a speed of 5 MPH in reverse direction, and not less than 20 sharp turns (10 to the right and 10 to the left) at maximum safe speeds in forward gear. During this operation the A-frame shall be erected at rear, the headlights shall be on and the

4 way flash signals shall be operated. There shall be no loosening or shifting of the body and its components. Vehicles selected with a removable cargo body shall be checked after this test for damage and shifting of stowed accessories.

4.3.2.8.1 Engine and cooling system test. To determine conformance to 3.4.3 and

3.4.3.1, during these tests, the engine and it's components and the cooling system shall be

observed for performance requirement.

4.3.2.8.2 Transfer case test. To determine conformance to 3.4.4.2, during these tests, the front wheel drive shal1 be engaged, and shall perform as specified.

4.3.2.8.3 Highway operational speed tests. To determine conformance to 3.4.5 through

3.4.8.2, during these tests the vehicle shall be operated at specified speeds and the vehicle observed for performance requirements.

4.3.2.8.4 Braking ability tests. To determine conformance to 3.4.8 through 3.4.8.2, during tests, the ability of the brakes to stop and hold vehicle as specified shall be observed for functional requirements.